Powerplant written
If the crankshaft runout readings on the dial indicator are plus .002 inches and minus .003 inch the runout is?
.005 inch
An air/fuel mixture ratio of 11:1 is?
1 part fuel to 11 parts air
How many of the following factors in establishing the maximum compression ratio limitations of an aircraft engine?
1. Detonation characteristics of the fuel used 2. Design limitations of the engine 3. Degree of supercharging
How many hours can a 130 amp hour battery deliver 12 amps?
10.83 hours
The density of air is very important when mixing fuel and air to obtain a correct fuel to air ratio. Which of the following weighs the most?
100 parts of dry air
What is the ampere hour rating of a storage battery that is designed to deliver 45 amperes for 2.5 hours?
112.5 ampere hour
Maximum power is normally considered to be developed in a reciprocating engine with an air/fuel mixture ratio of approximately?
12:1
What publication is used for guidance to determine whether a powerplant repair is major or minor?
14 CFR part 43
What is the total amount of ram air in a reciprocating engine that actually aids in cooling?
15-30%
The Federal Aviation Regulations require the fuel flow rate for gravity systems (main and reserve) to be?
150 percent of the takeoff fuel consumption of the engine.
What is the radial location of the two north poles of a four pole rotating magnet in a high tension magneto?
180º apart
What is the best fuel/air ratio for creating power?
1:15
An oil tank having a capacity of 5 gallons must have an expansion space of ?
2 quarts
The maximum allowable voltage drop between the generator and the bus bar is?
2% of the regulated voltage
Using the following information determine how many degrees the crankshaft will rotate with both the intake and exhaust valves seated? Intake opens at 15º BTDC Exhaust opens at 70º BBDC Intake closes at 45º ABDC Exhaust closes at 10º ATDC
245º
Standard sea level pressure is?
29.9 inHg
How many basic types of circuit breakers are used in powerplant installation systems?
3
In addition to fuel quantity, a computerized fuel system (CFS) with a totalizer indicator provides information of how many of the following?
3 Fuel flow rate Fuel used since reset or initial startup Fuel time remaining at current power setting
Boost manifold pressure is generally considered to be any manifold pressure above?
30" Hg
On turbojet powered airplanes, thrust reverser are capable of producing between?
35 and 50 percent of the rated thrust in the reverse direction
How many secondary coils are required in a low tension ignition system on an 18 cylinder engine?
36
Ignition occurs 28º BTDC on a certain four-stroke engine, and the intake valves opens at 15º BTDC. How many degrees of crankshaft travel after ignition does the intake valve open?
373º
What is the frequency of most aircraft alternating current?
400 hertz
At what speed must a crankshaft turn if each cylinder of a four stroke engine is to be fires 200 times a minute?
400 rpm
On a rotax 914 engine, the turbo control unit (TCU) transmits a signal to an external red boost lamp and an orange caution lamp. What is the maximum time the red lamp should be illuminated before taking action with full throttle operation?
5 minutes
Using standard atmospheric conditions, the standard sea level temperature is?
59º F
What speed must an eight pole ac generator turn to produce 400 hertz AC?
6,000 rpm
The volume of a cylinder equals 70 cubic inches when the piston is at bottom center. When the piston is at top of the cylinder the volume equals 10 cubic inches. What is the compression ratio/
7:1
How many hours will a 140 ampere hour battery deliver 15 amperes?
9.33 hours
Which of the following assists in removing heat from the metal walls and find of an air cooled cylinder assembly?
A baffle and cowl arrangement
What is the operating principle of the spot detector sensor in a fire detection system?
A bimetallic thermoswitch that closes when heated to a high temperature.
Which of the following may be used to accomplish internal inspection of an assembled turbine engine?
A borescope
Capacitance after firing in most modern spark plugs is reduced by the use of?
A built in resistor in each plug
Who is authorized to overhaul a carburetor?
A certified powerplant mechanic
Reciprocating engines used in helicopters are cooled by?
A fan mounted on the engine
When internally timing a magneto, the breaker points begin to open when the rotating magnet is?
A few degrees past the neutral position
If it is found that a shielded ignition system does not adequately reduce engine ignition noise, it may be necessary to install?
A filter between the magneto and magneto switch
Compressor stall is caused by ?
A high angle of attack airflow through the first stages of compression
How does the ignition system of a gas turbine engine differ from that of a reciprocating engine?
A high energy spark is required for ignition
When testing a magneto distributer block for electrical leakage, which of the following pieces of test equiptment should be used?
A high tension harness tester
what test instrument could be used to test an ignition harness for suspected leakage?
A high tension lead tester
When starting a turbine engine?
A hot start is indicated if the exhaust gas temperature exceeds specific limits
The fuel systems of aircraft certificated in the standard classification must include which of the following?
A positive means of shutting off the fuel to all engines.
The use of less than normal throttle during starting will cause?
A rich mixture
Upon inspection of the spark plugs in an aircraft engine, the plugs were found to be caked with a heavy black soot. This indicates?
A rich mixture
What is the first engine instrument indication of a successful start of a turbine engine?
A rise in the exhaust gas temperature
When performing a magneto ground check on an engine, correct operation is indicated by?
A slight drop in RPM?
When a new carburetor is installed on an engine?
And the engine is warmed up to normal temperature adjust the idle mixture then the idle speed
Grease used in aircraft propellers reduces the frictional resistance of moving part and is easily molded into any form under pressure, this statement defines?
Anti friction and plasticity characteristics of grease
In a reciprocating engine oil system, the temperature bulb senses oil temperature?
At a point after the oil has passed though the oil cooler
How often should float carburetors be overhauled?
At engine overhaul
When will small induction system air leaks have the most noticeable effect on engine operation?
At low RPM
If an engine with a stroke of 6 inches is operated at 2000 rpm, the piston movement within the cylinder will be?
At maximum velocity 90º after TDC
At what point in an axial flow turbojet engine will the highest gas pressure occur?
At the compressor outlet
When does valve overlap occur in the operation of an aircraft reciprocating engine?
At the end of the exhaust stroke and the beginning of the intake stroke.
Which statement is true regarding jet engines?
At the higher engine speeds, thrust increases rapidly with small increases in RPM.
Where is the main fuel strainer located in the aircraft fuel system?
At the lowest point in the fuel system
In a turbine engine dc capacitor discharge ignition system, where are the high voltage pulses formed?
At the triggering transformer
In a float type carburetor, what would cause a lean mixture and high cylinder head temperature at sea level or low altitudes?
Automatic mixture control sticks in the extended position
What could cause a lean mixture and high cylinder head temperature at sea level of low altitude?
Automatic mixture control stuck in the extended position
Fuel scheduling during APU start and under varying pneumatic bleed and electrical load is maintained?
Automatically by the APU fuel control system
A bell mouth inlet duct has a high aerodynamic efficiency and is considered an advantage to what?
Axial flow
Pneumatic starters are usually designed with what types of airflow?
Axial flow
How is the flow range of the fuel discharge nozzles in a fuel injected reciprocating engine indicated?
By a letter stamped on the hex of the nozzle body
How is anti-icing fluid ejected from the slinger ring on a propeller?
By centrifugal force.
Which of the following, obtained during magneto check at 1,700 rpm indicates a short (grounded) circuit between the right magneto primary and the ignition switch?
BOTH -- 1,700 RPM, R -- 0 RPM, L -- 1,700 RPM, OFF -- 0 RPM.
Which of the following is least likely to occur during operation of an engine equipped with a direct cylinder fuel injection system?
Backfiring
If the intake valve is opened too early in the cycle of operation of a four stroke cycle engine, it may result in??
Backfiring of the induction system
Fuel pump relief valve designed to compensate for atmospheric pressure variations are known as?
Balance type relief valves
On a carburetor without an automatic mixture control as you ascend in altitude the mixture will?
Be enrivhed
Maximum taper contact between crankshaft and propeller hub is determined by using?
Bearing blue color transfer
Why must a float type carburetor supply a rich mixture during idle?
Because at idling speed the engine may not have enough airflow around the cylinders to provide proper cooling
In a four stroke cycle aircraft engine, when does the ignition event take place?
Before the piston reaches TDC on compression stroke
The spark is produced in a magneto ignition system when the breaker points are?
Beginning to open
The time/current capacities of a circuit breaker or fuse must be?
Below those of the associated conductor
One of the things a metering orifice in a main air bleed helps to accomplish (at a given altitude) in a carburetor is?
Better fuel vapor action and control of fuel discharge, especially at lower engine speeds
What does valve overlap promote?
Better scavenging and cooling characteristics
The throttle valve in a float type carburetor is located?
Between the venturi and the engine
What will happen to the propeller blade angle and the engine RPM if the tension on the propeller governor control spring (Speeder Spring) is increased?
Blade angle will decrease and RPM will increase
Which of the following is identified as the cambered or curved side of a propeller blade, corresponding to the upper surface of a wing airfoil section?
Blade back
Propeller blade stations are measured from the?
Blade centerline
What are the two parts of a distributor in an aircraft engine ignition system?
Block and rotor
A rotax 913 engine is a dry sump system. How is oil returned to the external tank?
Blowby gasses
Which of the following defects is cause for rejection of wood propellers?
Bonding or separating of the trailer edge of the propeller blade
When an electric primer is used, fuel pressure is built up with the?
Booster pump
How is the speed of a constant speed propeller changed in flight?
By changing the load tension against the flyweights in the governer
How should ceramic coated exhaust components be cleaned?
By degreasing
Cast iron piston rings may be used in chrome plated cylinders Chrome plated piston rings may be used in plain steel cylinders?
Both are true
During operational checks of an aircraft using hydromatic full feathering propellers, the following observations are made: The feather button, after being pushed, remains depressed until the feather cycle is complete, then opens. When unfeathering it it necessary to manually hold the button down until unfeathering is accomplished.
Both feather cycle and unfeathering cycle are functioning properly
When using a timing light to time a magneto to an aircraft engine, the magneto switch should be placed in the?
Both position
Full floating piston pins are those which allow motion between the pin and ?
Both the piston and the small end of the connecting rod
Instruments that measure relatively high fluid pressures, such as oil pressure gauges, are usually what type?
Bourdon tube
The actual power delivered to the propeller of an aircraft engine is called?
Brake horsepower
Turboprop engines measure power produced with a torque meter, and its proportional to what type of piston engine horsepower?
Brake horsepower
What type of nuts are used to hold an exhaust system to the cylinders?
Brass or heat-resistant nuts
What retains the nitrogen charge and fire extinguishing agent in a high rate of discharge (HRD) container?
Breakable disk and fusible disk
On an engine equipped with a pressure type carburetor, fuel supply in the idling range is ensured by the inclusion in the carburetor of?
A spring in the unmetered fuel chamber to supplement the action of normal metering forces
The vortex dissipates installed on some turbine powered aircraft to prevent engine FOD utilize?
A stream of engine bleed air blown forward the ground ahead of the engine
Bootstrapping of a turbocharged engine is indicated by?
A transient increase in engine power
High cylinder head temperatures are likely to result from?
A very lean mixture at high power settings
What will be the likely result if piston gaps happen to be aligned when performing a differential pressure compression check on a cylinder?
A worn or defective ring indication
Which of the following statements about constant speed counterweight propellers is also true when referring to two position counterweight propellers?
A- Blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal.
What is the function of the inlet guide vane assembly on a axial flow compressor?
A- Directs the air into the first stage rotor blades at the proper angle.
What is the result of moving the throttle on a reciprocating engine when the propeller is in the constant speed range with the engine developing cruise power?
A- Opening the throttle will cause an increase in blade angle.
What could be the result of undetected exhaust system leaks in a reciprocating engine powered airplane?
A- Pilot/passenger incapacitation caused by carbon monoxide entering the cabin.
What is the purpose of the dump valve used on aircraft gas turbine engines?
A- The fuel is quickly cut off to the nozzles and the manifolds are drained preventing fuel boiling off as a result of residual engine heat.
What is meant by a shrouded turbine?
A- The turbine blades are shaped so that their ends form a band or shroud.
Why is the pulley stop screw on a propeller governor adjustable?
A- To limit the maximum engine speed during takeoff.
Air turbine starters are generally designed so that the reduction gear distress or damage may be detected by?
Breakage of a shear section on the starter drive shaft
Indentations on bearing races caused by high static loads are known as?
Brinelling
Which of the following is a good indication of a malfunctioning fuel nozzle when inspecting the exhaust section of a turbine engine?
Buckling of the combustion liner
A defective primary capacitor in a magneto is indicated by?
Burned and pitted breaker points
Which of the following influences the operation of an automatic fuel control unit on a turbojet engine?
Burner pressure
Detonation occurs when the air/fuel mixture?
Burns too fast
What is a basic advantage of using AC for electrical power on large aircraft?
AC systems operate at a higher voltage than DC systems and therefore use less current and can use smaller and lighter weight wiring
How do the turbines which are driven by the exhaust gases of a turbo compound engine contribute to the total engine power output?
By driving the crankshaft through suitable couplings
How can a steel propeller hub be tested for cracks?
By magnetic particle inspection
How are piston pins of most aircraft engines lubricated?
By oil which is sprayed or thrown by the master or connecting rods.
How is proper eng-gap clearance on a new piston ring assured during the overhaul of an engine?
By placing the rings in the cylinder and measuring the end-gap with a feeler guage
How are combustion liner walls cooled in a gas turbine engine?
By secondary air flowing through the combustion chamber
How is aircraft electrical power for propeller deicer systems transferred from the engine to the propeller hub assembly?
By slip rings and brushes
How are the teeth of the gears in the accessory section of an engine normally lubricated?
By splashed or sprayed oil.
How is the propeller controlled in a large aircraft with a turboprop installation?
By the engine power lever
How are most radial engine spark plug wires connected to the distributer block?
By use of cable piercing screws
How are the rotor windings of an aircraft alternator usually excited?
By variable direct current
If an oil filter element becomes clogged the?
Bypass valve will open and the oil pump will supply unfiltered oil
In which type of turbine engine combustion chamber is the case and liner removed and installed as one unit during routine maintenance?
Can
The wiring OEM color code on civilian aircraft will have what result with a military technician?
Can cause problems (different color codes)
The type of ignition system used on most turbine aircraft engines is?
Capacitor discharge
The most satisfactory extinguishing agent for an electricial fire is?
Carbon dioxide
The most satisfactory extinguishing agent for carburetor or intake fire is?
Carbon dioxide
A fine, pencil like line running across a non conductive surface of a magneto that is caused by flashover is called?
Carbon tracking
What part of an aircraft in flight will begin to accumulate ice before any other?
Carburator
During full power output of an un-supercharged engine equipped with a float type carburetor, in which of the following areas will the highest pressure exist?
Carburetor air scoop
The greatest portion of heat generated by combustion in a typical aircraft reciprocating nine is?
Carried out with the exhaust gases
Which of the following instrument conditions is acceptable and does not require immediate correction?
Case paint chipped
In a supervisory EEC system, any fault in the EEC that adversely affects engine operation
Causes an immediate reversion to control by the hydro mechanical fuel control unit
What operational force causes the greatest stress on a propeller?
Centrifugal force
Which of the following George's or combination of forces operates to move the blades of a constant speed counterweight type propeller to the high pitch position?
Centrifugal force acting on the counterweights
During the on-speed condition of a propeller, the?
Centrifugal force of the governor flyweights is equal to the speeder spring force
Which of the following can inspect and approve an engine major repair for return to service?
Certificated mechanic with inspection authorization.
The primary purpose of a propeller is to?
Change engine horsepower to thrust
During idle mixture adjustments, which of the following is normally observed to determine when the correct mixture has been achieved?
Changes in RPM and manifold pressure
If the RPM of an axial flow compressor remains constant, the angle of attack of the rotor blades can be changed by?
Changing the velocity of the airflow
Which of the following component inspections is to be accomplished on a 100-hour inspection?
Check cylinder compression
What precaution is usually taken to prevent freezing damage to the electrolyte in a sealed lead acid battery?
Check the circuit voltage
Which of the following prevents oil from entering the main accessory case when the engine is not running?
Check valve
What advantage fo mineral base lubricants have over vegetable oil base lubricants when used in aircraft engines?
Chemical stability
Blade angle is the angle formed by a line perpendicular o the crankshaft and a line formed by the?
Chord of the blade
Propeller blade angle is the angle between the?
Chord of the blade and the rotational plane of the propeller
Turbine engine EGT thermocouples are constructed of?
Chrome and alumel
What type of electrical circuit protection is used for powerplant electrical systems?
Circuit breakers
A fuel or oil fire is defined as a?
Class B fire
A fire involving energized electrical equiptment is defined as?
Class C fire
What is the possible cause of an engine running rich at full throttle if it is equipped with a float type carburetor?
Clogged main air bleed valve
The position of the cowl flaps during normal cruise flight conditions is?
Closed
The pulling out (or down) of an illuminated fire handle in a typical large jet aircraft fire protection system commonly accomplishes what events?
Closes fuel shutoff, closes hydraulic shutoff, disconnects the generator field, and arms the fire-extinguishing system.
When necessary, APU engine cooling before shutdown ma y be accomplished by?
Closing the bleed air valve
Which of the following breaker point characteristics is associated with a faulty capacitor?
Coarse grained
When starting an engine equipped with a carburetor air heater, in which position should the heater be placed?
Cold
Which of the following methods is used to straightened a bent aluminum propeller blade that is within repairable limits?
Cold straighten only
The primary source of oil contamination in a normally operating reciprocating engine is?
Combustion deposits due to combustion chamber blow by and oil migration on the cylinder walls
What turbine engine section provides for proper mixing of fuel and air?
Combustion section
When installing electrical wiring parallel to a fuel line, the wiring should be?
Above the fuel line
If an engine equipped with a float type carburetor backfires or misses when the throttle is advanced, a likely cause is that the?
Accelerating pump is no operating properly
A carburetor is prevented from leaning out during quick acceleration by the?
Accelerating system
What component is used to ensure fuel delivery during periods of rapid engine acceleration?
Acceleration pump
The stationary field strength in a direct current generator is varied?
According to load requirements
What should be used to clean grease or carbon tracks from capacitors or could that are used in magnetos?
Acetone
Where do stress rupture cracks usually appear on turbine blades?
Across the leading or trailing edge at right angles to the edge length
Which method is commonly used to adjust the level of a float in a float type carburetor?
Add or remove shims under the needle valve seat
A propeller synchrophasing system allows a pilot to reduce noise and vibration by?
Adjusting the phase angle between the propellers on an aircrafts engines
A supervisory electronic engine control (EEC) is a system that receives engine operating information and?
Adjusts a standard hydro mechanical fuel control unit to obtain the most effective engine operation
What will be the results of increasing the gap of the breaker points in a magneto?
Advance the spark and decrease its intensity
What operational force tends to increase the propeller blade angle?
Aerodynamic twisting force.
Where is the engine fuel shutoff valve usually located?
Aft of the firewall
When lubricating a newly overhauled steel hub propeller, you should lubricate the propeller?
After one or two hours of operation
Generally, when starting a turbine engine, the starter should be disengaged?
After the engine has reached self-accelerating speed
Where is the throttle valve located on a float type carburetor?
After the main discharge nozzle and the venturi
The primary purpose of the air bleed opening used with continuous flow fuel injector nozzles is to?
Aid in proper fuel vaporization
The purpose of an inter cooler when used with a turbocharger is to cool the?
Air entering the carburetor from the turbocharger
Carburetor icing is most severe at?
Air temperatures between 30 and 40 ºF
During the operation of an aircraft engine, the pressure drop in the carburetor venturi depends primarily upon the?
Air velocity
When inspecting an aircraft reciprocating engine what document is used to determine if the proper magnetos are installed?
Aircraft Engine Specifications or Type Certificate Data Sheets.
Fuel is normally supplied to the APU by?
Airplanes main fuel tank
What section in the instructions for continued airworthiness is FAA approves?
Airworthiness limitations section
Carburetor icing may be eliminated by which of the following methods?
Alcohol spray and heated induction air.
An aircraft engine continuous cylinder fuel injection system normally discharges fuel during which strokes?
All (continuously)
At what engine speed does the main metering jet actually function as a metering jet in a float type carburetor?
All RPM's above idle range.
If the turbocharger waste gate is completely closed?
All of the exhaust gases are directed through the turbine
Defective spark plugs will cause the engine to run rough at?
All speeds
A cool-off period prior to shut down of a turbine engine is accomplished in order to?
Allow the turbine wheel to cool before the case contracts around it
Which of the following is NOT an input parameter for a turbine engine fuel control unit?
Ambient humiity
Aircraft electrical wire is manufactured in sizes according to a standard known as?
American Wire Gauge (AWG)
High tooth pressure and high rubbing velocities, such as occur with spur type gears, require the use of?
An EP lubricant
What method is ordinarily used to make idle speed adjustments on a float type carburetor?
An adjustable throttle stop or linkage
The thrust produced by a rotating propeller is a result of?
An area of decreased pressure immediately in front of the propeller blades
An APU is usually rotated during start by?
An electric starter
The fuel flow indicator and needle for a motor impeller and turbine indicating system is driven by?
An electrical signal
Backfiring through the carburetor generally results from the use of?
An excessively lean mixture
One cause of after firing in an aircraft engine is?
An excessively rich mixture
An excessively lean fuel/air mixture may cause?
An increase in cylinder head temperature
Which of the following causes a single diaphragm accelerator pump to discharge fuel?
An increase in manifold pressure to occurs when the throttle valve is opened
Failure of an engine to cease firing after turning the magneto switch off is an indication of?
An open P-lead to ground
Generator voltage will not build up when the field is flashed and solder is found on the brush cover plate, these are most likely indications of?
An open armeture
If an aircraft ignition switch is turned off and the engine continues to run normally, the trouble is probably caused by?
An open ground lead in the magneto
Which of the following defects is caused for rejection of wood propellers?
An oversized hub or bolt holes or elongated bolt holes
What type of oil system is usually found on turbine engines?
Dry sump, pressure and spray
An aircraft reciprocating engine using hydraulic valve lifters is observed to have no clearance in its valve operating mechanisms after the minimum inlet oil and cylinder head temperatures for takeoff have been reached. When can this condition be expected?
During normal operation
Lube system last chance filters in turbine engines are usually cleaned?
During overhaul
Valve overlap is defined as the number of degrees of crankshaft travel?
During which both valves are off their seats
What method would be used to inspect an aluminum propeller blade whe a crack is suspected ?
Dye penetrant
When troubleshooting an engine that will not idle, what would be a probably cause?
Economizer valve not operating correctly
Geometric pitch of a propeller is defined as the?
Effective switch plus slippage
The actual distance a propeller moves forward through the air during one revolution is knows as the?
Efffective pitch
How is the oil pressure delivery on a hydromatic propeller normally stopped after the blade have reached their full feathered position?
Electric cutout pressure switch
How are most aircraft turbine engine fire extinguishing systems activated?
Electrically discharged cartridges
Spark plugs are considered worn when the?
Electrodes have worn away about one half of their original dimensions
Any time a conductor carries high voltage energy and is installed near a conductive mass, the insulation around the conductor is exposed to what?
Electromagnetic radiation
What special procedure must be followed when adjusting the valves of an engine equipped with a floating cam ring?
Eliminate cam bearing clearance when making valve adjustment.
It is important that nicks in aluminum alloy propeller blades be repaired as soon as possible in order to?
Eliminate stress concentration points
The primary purpose of a feathering propeller is to?
Eliminate the drag created by a wind milling propeller when an engine fails in flight
What precautions should be taken when putting thread lubrications on a tapered pipe plug ina. Carburetor float bowl?
Engage the first thread of the plug, then put a small amount of lubricant on the second thread and screw the plug in
An oil separator is generally associated with which of the following?
Engine driven vacuum pump
A fuel pressure relief valve is required on?
Engine driven vane type fuel pump
What would be the effect if the spark plugs are happed too wide and the engine is operating at a high altitude airport
Engine fails to idle properly
Which of the following engine servicing operations generally requires engine pre oiling prior to starting the engine?
Engine installation.
What is the possible cause when a turbine engine indicated no change in power serving parameters, but oil temperature is high?
Engine main bearing distress
Who establishes mandatory replacement times for critical components of a turbine engine?
Engine manufacturer
Who establishes the recommended operating time between overhaul (TBO) of a urbane engine used in general aviation?
Engine manufacturer
What publication contains the mandatory replacement parts of a turbine engine?
Engine manufacturers service instructions
Which of the following should a mechanic consult to determine the maximum amount of cylinder cooling fins that could be removed when cracks are found?
Engine manufacturers service or overhaul manual
Name the working fluid that provides pressure to the variable inlet guide vane actuators used on some turbine engine compressors?
Engine oil
What fluid is used to move bleed band actuators?
Engine oil
In which of the following situations will the oil cooler automatic bypass valve be open to the greatest amount?
Engine oil below normal operating temperature
Which of the following can cause fan blade shingling in a turbofan engine?
Engine over speed and FOD
What instrument indicated the thrust of a gas turbine engine?
Engine pressure ratio indicator
The electrical circuit from the spark plug back to the magneto is completed by grounding through the?
Engine structure
The engine pressure ratio (EPR) indicator is a direct indication of?
Engine thrust being produced
The auto feather system determines when to feather the propeller by monitoring?
Engine torque
If the idling jet becomes clogged in a float type carburetor, the?
Engine will not idle
If the ground wire of a magneto is disconnected at the ignition switch, the result will be the?
Engine will not stop running when the ignition switch is turned off
When operating an engine, the application of carburator heat will have what effect on the fuel/air mixture?
Enriching the mixture until the AMC can make a compensation
Engine oil temperature gauges indicate the temperature of the oil when?
Entering the engine
What maintenance records is/are required following a major repair of an aircraft engine?
Entries in the engine maintenance record and FAA form 337
The recurrent ingestion of dust or other fine airborne particulates into a turbine engine can result in?
Erosion damage to the compressor and turbine secctions
Newton's first law of motion, generally termed "law of inertia" states:
Everybody persists in its state of rest, or in motion in a straight line, unless acted upon by some outside force
Dislodged internal muffler baffles on a small reciprocating engine may cause?
Excessive exhaust back pressure
Turbine engine after flame is caused by?
Excessive fuel in the combustion section, turbine, or exhaust nozzles
In what section of a turbojet engine is the jet nozzle located?
Exhaust
On which stroke are both valves on a four stroke cycle reciprocating aircraft engine open?
Exhaust and intake
What are the three basic regulating components of a sea level boosted turbocharger system?
Exhaust bypass assembly, density controller, and differential pressure controller.
Which of the following is used to monitor the mechanical integrity of the turbines, as well as to check engine operating conditions of a turbine engine?
Exhaust gas temperature
One source commonly used for carburetor heat is?
Exhaust gases
Augmenter tubes are part f which reciprocating engine system?
Exhaust system
What part of an air cooled cylinder assembly has the greatest fin area per square inch?
Exhaust valve port
Turbine blades are generally more susceptible to operating damage than compressor blades because of?
Exposure to high temperatures
Oil accumulation in the cylinders of an inverted in line engine and in the lower cylinders of a radial engine is normally reduced or prevented by?
Extended cylinder skirts
Which of the following FARs lists the procedural requirements for the issuance of an STC?
FAR 21
Which of the following contains a minimum checklist for 100 hour inspection of an engine?
FAR 43 appendix D
Which of the following FAR states "no person may describe in any required maintenance entry to form an aircraft, airframe, aircraft engine, propeller, appliance, or component part a being overhauled unless"?
FAR 43.2
The airworthiness standards for the issue of a type certificate for small airplanes with nine of less passenger seats in the normal, utility, and acrobatic categories may be found in the?
FAR part 23
Which FAR requirement prevents the use of automatic reset circuit breakers?
FAR part 23
Which FAR specifies that each resettable circuit protective device requires a manual operation to restore service after the device has interrupted the circuit?
FAR part 23
Which of the following FARs require that all aircraft using fuses as the circuit protective devices carry "one spare set of fuses, or three separate spare fuses of each kind required"?
FAR part 91
In an aircraft ignition system, one of the functions of the capacitor is to?
Facilitate a more rapid collapse os the magnetic field in the primary coil
When starting a turbine engine, a hung start is indicated if the engine?
Fails to reach idle RPM
Inspection of propeller blades by dye-penetrant inspection is accomplished to defect?
Fatigue failure
Ignition check during engine run up indicated excessive RPM drop during operation on the right magneto. The major portion of the rpm loss occurs rapidly after switching to the right magneto position (fast drop) the most likely cause is?
Faulty or fouled spark plugs
The auto feather system, when armed will?
Feather the propeller automatically if power is lost from either engine
Longitudinal (for and aft) clearance of constant speed propeller blades or cuffs must be atleast 1/2 inch (12.7mm) between propeller parts and stationary parts of the aircraft. This clearance is with the propeller blades?
Feathered or in the most critical pitch configuration
The holding coil on a hydrostatic propeller feathering button switch holds a solenoid relay closed that applies power to the propeller?
Feathering pump motor
Proper operation of electric deicing boots on individual propeller blades may best be determined by?
Feeling the sequence of booth heating and have an assistant observe the load meter indications
The fire detection system that uses a single wire surrounded by a continuous string of ceramic beads in a tube is the?
Fenwal system
The procedure for removing the accumulation of dirt deposits on compressor blades is called?
Field cleaning
Minor surface damage located in a repairable are, but not on the leading or trailing edge of aluminum blades, may be repaired by first?
Filing with a riffle file
The components ina. Turbine engine that operates at the highest temperatures is/are the?
First stage turbine nozzle guide vanes
The breaking loose of small pieces of metal from coated surfaces, usually caused by defective plating or excessive loads is called?
Flaking
During an operational check of an electrically powered radial engine cowl flap system, the motor fails to operate. Which of the following is the first to be checked?
Flap actuator motor circuit breaker
The condition that occurs when moisture allows high voltage current to flash across a non conductive surface in a magneto is known as?
Flashover
You replace the fuel control unit on an aircraft gas-turbine engine. Which of the following adjustments would not be appropriate to perform?
Flight idle RPM
If fuel is found running from the carburetor with the engine not running, the likely cause is that the?
Float needle valve is not seated properly
Why is expansion space required in an engine oil supply tank?
For oil enlargement and collection of foam.
The primary purpose of baffles and deflectors installed around cylinders of air-cooled aircraft engines is to?
Force cooling air into close contact with all parts of the cylinders
As the flux density in the field of a dc generator increases and the current flow to the system increases the?
Force required to turn the generator increases
Prolonged idling of an engine will usually result in?
Foreign material buildup on the spark plug
A drop in oil pressure may be caused by?
Foreign material under the relief valve
The maximum number of terminals that may be connected to any one terminal stud in an aircraft electrical system is?
Four
What is the maximum number of bonding jumper wires that may be attached to one terminal grounded to a flat surface?
Four
The fuel flow indication data sent form the motor driven impeller and turbine, and motor less type fuel flow transmitters is a measure of?
Fuel mass flow
The fuel flowmeter used with a continuous fuel injection system installed on an aircraft horizontally opposed reciprocating engines measures the fuel pressure drop across the?
Fuel nozzles
The fuel indication system used with many fuel-injected opposed engine airplanes utilizes a measure of?
Fuel pressure
What causes the fuel divider valve to open in a turbine engine duplex fuel nozzle
Fuel pressure
What should be checked/changed to ensure the validity of a turbine engine performance check if an alternate fuel is to be used?
Fuel specific gravity setting
Turbine engine flameout maybe caused by improper?
Fuel/air mixture
The purpose of an exhaust gas analyzer is to indicate the?
Fuel/air ratio being burned in the cylinders
The greatest density of the flux lines in the magnetic circuit of a rotating magnet type magneto occurs when the magnet is in what position?
Full alignment with the field shoe faces.
In what position is the constant speed propeller control placed to check the magneto?
Full increase, low propeller blade pitch angle
What is the position of the cowl flaps during engine starting and warmup operations under normal conditions?
Full open at all times
What is the approximate position of the rotating magnet in a high tension magneto when the points first close?
Full register
When running up an engine and testing a newly installed hydromatic propeller, it is necessary to exercise the propeller by moving the governor control through its entire travel several times to?
Free the dome of any entrapped air
Basically the indicator of a tachometer system is responsive to a change in?
Frequency
The RPM indication of a synchronous AC motor tachometer is governed by the generator?
Frequency
Propellers exposed to salt spray should be cleaned with?
Fresh water
Fuel is discharged for idling speeds on a float type carburetor?
From the idle discharge nozzle
Engine pressure ratio is the total pressure ratio between?
Front of the compressor and rear of the turbine
Which unit is most accurately indicates fuel consumption of a reciprocating engine?
Fuel flowmeter
Which statement is correct regarding a continuous flow fuel injection system used on many reciprocating engine?
Fuel is injected at each cylinder intake port
Which of the following lubrication system components is never located between the pressure pump and the engine pressure system?
Fuel line for oil dilution system
As a general rule, the mixture setting on a reciprocating engine operating at or near takeoff power that provides the best cooling is?
Full rich
During ground operation of an engine, the cowl flaps should be in what position?
Fully open
What effect does high atmospheric humidity have on the operation of a jet engine?
Has little to no effect
Compared to recipricating engine oils the types of oils used in turbine engines?
Have less tendancy to produce lacquer and coke
A bell mouth inlet duct is typically installed on engine tests cells and on what?
Helicopters
Alternators (AC generators) that are driven by a constant speed drive (CSD) mechanism are used to regulate the alternator to a constant?
Hertz output
Engines using cold stream or both old and hot stream reversing include?
High bypass turbofans
Which of these characteristics is desirable in turbine engine oil?
High flash point
Igniter plugs have nickel-chromium (nichrome) plating for?
High heat and corrosion resistance
The capacitor type ignition system is used almost universally on turbine engines primarily because of its high voltage and?
High heat intensity
Which of these conditions will cause an engine to have an increased tendency to detonate?
High manifold pressure, high intake air temperature, and engine overheated.
What is the best indication of worn valve guides?
High oil consumption
An advantage of the axial flow compressor is its?
High peak efficiency
Which of the following best describes the blade movement of a full feathering, constant speed propeller that is in the LOW RPM position when the feathering action is begun?
High pitch directly to feather position.
The primary advantage of pneumatic (air turbine) shatters over comparable electric starters for turbine engines is?
High power-to-weight ratio
What are the rotational speed and blade pitch angle requirements of a constant speed propeller during takeoff?
High speed and low-pitch angle
During which of the following conditions of flight will the blade pitch angle of a constant speed propeller be the greatest?
High-speed, high altitude cruising flight
How does a dual axial flow compressor improve the efficiency of a turbojet engine?
Higher compression ratios can be obtained
Compared to normally aspirated engines, turbocharged engines exhaust systems operate at?
Higher temperatures and higher pressures
The principal fault in the pressure type fuel flowmeter indicating system, installed on a horizontally opposed continuous-flow fuel injected aircraft reciprocating engine is that a plugged fuel injection nozzle will cause a?
Higher than normal fuel flow indication
How is the strength of a magneto checked?
Hold the points open and check the output of the primary coil with an ac ammeter while operating the magneto at a specific speed
A rotax 582 is a liquid cooled engine. How are the vapors carried back to the radiator or overflow tank?
Hoses and lines
Which of the following indicates that a combustion chamber of a jet engine is not operating properly?
Hot spots on the tail cone
Thermocouples are usually inserted or installed on the?
Hottest cylinder of the engine
In a turbine engine, where is the turbine discharge pressure indicator sensor located?
Immediately aft of the last turbine stage
The exhaust section of a turbine engine is designed to?
Impart a high exit velocity to the exhaust gases
What are the two functional elements in a centrifugal compressor?
Impeller and diffuser
Which of the following would be cause for rejection of a spark plug?
Insulator tip cracked.
The five events of a four stroke cycle engine in the order of their occurrence is?
Intake, compression, ignition, power, and exhaust
The purpose of the diaphragm in most vane type fuel pumps is to?
Compensate fuel pressure to altitude changes
If an engine and propeller were submerged in water, what could be done in order to return them to service?
Complete disassembly, thouroughly clean, thouroughly dry, and treat with corrosion inhibiter
What is the purpose of a turbocharger system for a small reciprocating aircraft engine?
Compresses air to maintain manifold pressure constant from sea level to the critical altitude of the engine
What action takes place when the cockpit control lever for a hydromatic, constant speed propeller is actuated?
Compression of the speeder spring is changed
If the exhaust valve of a four stroke cycle engine is closed and the intake valve is just closing, the piston is on the ?
Compressions stroke
If a turbine engine is unable to reach takeoff EPR before the EGT limit is reached, this is an indication that the?
Compressor may be contaminated or damaged
At what state in a turbine engine are gas pressures the greatest?
Compressor outlet
The stator vanes in an axial flow compressor?
Convert velocity energy into pressure energy
What is the purpose of an "aftercooler" in a turbocharging system?
Cool air entering the carburetor from the turbocharger
What is the primary purpose of the oil to fuel heat exchanger?
Cool the oil
Aircraft reciprocating engine cylinder baffles and deflectors should be repaired as required to prevent loss of
Cooling
In addition to lubricating (reducing friction between moving parts) engine oil performs what functions?
Cools, seals, cleans, prevents corrosion, and cushions impact (shock).
What compound should be put on spark plug threads?
Copper based
When removing a shielded spark plug, which of the following is most likely to be damaged?
Core insulator
What is the principle of operation of the continuous loop fire detection system sensor?
Core resistance material which prevents current flow at normal temperature
Propeller aerodynamic (thrust) imbalance can be largely eliminated by?
Correct blade contouring and angle settings
Why is high nickel chromium steel used in many exhaust systems?
Corrosion resistance and low expansion coefficient
Which of the following instrument discrepancies require replacement of the instrument?
Cracked glass Will not zero out Pointer loose on shaft Fogged
A turbine engine hot section is particularly susceptible to which kind of damage?
Cracking
Which of the following conditions is usually not acceptable to any extent in turbine blades?
Cracks
The hot section of a turbine engine is particularly susceptible to which of the following kind of damage?
Crakcing
What is the purpose of the flow divider in a turbine engine duplex fuel nozzle?
Creates the primary and secondary fuel supplies.
Continued and/or excessive heat and centrifugal force on a turbine engine rotor blades is likely to cause?
Creep
What term is used to describe a permanent and cumulative deformation of the turbine blades of a turbojet?
Creep
To what altitude will a turbo charged engine maintain sea level pressure?
Critical altitude
A ground incident that results in propeller sudden stoppage would require a crankshaft runout inspection. What publication would be used to obtain crankshaft runout tolerance?
Current manufacturers maintenance instructions
What is required by FAR part 43 appendix D when performing a annual/100 hour inspection on a recipricating engine aircraft?
Cylinder compression check
Where are cooling fins usually located on air cooled engines?
Cylinder head, cylinder barrel, and inside the piston head
Compilation ratio is the ratio between the?
Cylinder volume with the piston at bottom dead center and at top dead center
Increased engine heat will cause volumetric efficiency to?
Decrease
Excessive valve clearance will cause the duration of valve opening to?
Decrease for both intake and exhaust valves
During engine operation, if carburetor heat is applied, it will?
Decrease the air density to the carburetor
Stator blades in the compressor section of an axial flow turbine engine?
Decrease the air velocity and prevent swirling
One purpose of an air bleed in a float type carburetor is to?
Decrease the fuel density and destroy surface tension
The compressor stators in a gas turbine engine act as diffusers to?
Decrease the velocity of the gas flow
The application of carburetor heat during engine operation will?
Decrease the weight of the fuel/air charge
Increased water vapor (higher relative humidity) in the incoming air to a reciprocating engine will normally result in which of the following?
Decreased engine power at a constant RPM and manifold pressure.
The pressure of subsonic air as it flows through a convergent nozzle?
Decreases
The pressure of subsonic air as it flows through a divergent nozzle?
Decreases
Excessive valve clearance in a piston engine?
Decreases valve overlap
Which of the following is a characteristic of a thrust bearing used in most radial engines?
Deep groove ball
As manifold pressure increases in a Reciprocating engine, the?
Density of the air in the cylinder increases
A full-authority electronic engine control (EEC) is a system that receives all the necessary data for engine operation and?
Develops the commands to various actuators to control engine perimeters
Instruments that provide readings of low or negative pressure, such as manifold pressure gauges, are usually what type?
Diaphragm or bellows
Which engine cycle depends on high compression pressures to provide for the ignition of the fuel/air change in the cylinder?
Diesel
The part of a dc alternator power system that prevents reverse flow of current from the battery to the alternator is the?
Diode
When installing an electrical switch, under which of the following conditions should the switch be derrated from its nominal current rating?
Direct current motor circuits
What type of electrical motor is generally used with direct-cranking engine starter?
Direct current-series wound
The purpose of a three way propeller valve is to?
Direct oil from the engine oil system to the propeller cylinder
The purpose of the flow control valve in a reciprocating engine oil system is to?
Direct oil through or around the oil cooler
One function of the nozzle diaphragm in a turbine engine is to?
Direct the flow of gases to strike the turbine blades at the desired angle.
Hi-bypass turbine engines equipped with T/Rs use cold and hot streams of air that may be?
Discharged through the reversing sleeve
The purpose of an undercurrent relay, or solenoid in a starter generator system is to?
Disconnect power from the starter-generator and ignition when sufficient engine speed is reached
Sodium filled valves are advantageous to an aviation engine because they?
Dissipate heat well
Specific gravity is a comparison of the weight of a substance to the weight of an equal volume of?
Distilled water at room temperature
A certain nine cylinder radial engine used a non-compensated single unit, dual type magneto with a four pole rotating magnet and separately mounted distributors. Which of the following will have the lowest RPM at any given engine speed?
Distributors
Select the statement which is correct relating to a fuel level check of a float type carburetor?
Do not measure the level at the edge of the float chamber
Igniter plugs used in turbine engines have a long service life because they?
Do not require continuous operation
A turbine engine compressor which contains vanes on both sides of the impeller is a?
Double entry centrifugal compressor
What is used to polish commutator sir slip rings?
Double zero sand paper
A safety feature usually employed in pneumatic starters that is used if the clutch does not release from the engine drive at the proper time during start is the?
Draft shaft shear point
In turbine engines that utilizes a pressurization and dump valve, the dump portion of the valve?
Drains the engine manifold lines to prevent fuel boiling and subsequent deposits in the lines as a result of residual engine heat (at engine shutdown)
The turbine section of a jet engine?
Drives the compressor section
One way that the automatic ignition relight system are activated on gas turbine engines is by a?
Drop in com pressure discharge pressure
Sudden stoppage occurs when one or more of the propeller blades strikes an object in such a way that the RPM?
Drops to zero in less that one revolution
The purpose of a bell mouth compressor inlet is to?
Maximize the aerodynamic efficiency of the inlet
The application of more protective coating on one blade than another when refinishing a wood propeller?
May be necessary to achieve final balancing
Generally, a small crack just started in a cylinder baffle?
May be stop drilled
Cracks in cooling fins that do not extend into the cylinder?
Maybe repaired by removing the affected area and contour filing within limits
A change in engine manifold pressure has a direct effect on the?
Mean effective cylinder pressure
Which of the following functions requires the use of a propeller blade station?
Measuring blade angle
Which of the following factors has the least effect on the oil consumption of a specific engine?
Mechanical efficiency
Which of the following turbine fuel filters has the greatest filtering action of any present-day filter type?
Micron filter
Which of the following fire detection systems are commonly used in an engine nacelle?
Middle continuous loop
When preparing a propeller blade for inspection it should be cleaned with?
Mild soap and water
The recommended aircraft engine lubricants are?
Mineral and synthetic bases
During a 100 hour inspection on a wooden propeller, you find that it is necessary to replace the laminate, this is a?
Minor maintenance
The device that controls the ratio of the fuel/air mixture to the cylinders is called a?
Mixture control
What factor is not used in the operation of an aircraft gas turbine engine fuel control unit?
Mixture control position
If carburetor or induction system icing is not present when carburetor heat is applied with no change in the throttle setting, the?
Mixture will become richer
What is the primary purpose of the tachometer on an axial compressor turbine engine?
Monitor engine RPM during starting and to indicate over speed conditions
Which statement is true regarding the air passing through the combustion section of a jet engine?
Most is used for engine cooling
Which statement is correct regarding engine crankshafts?
Moveable counterweights serve to reduce the torsional vibrations in an aircraft reciprocating engine.
If the thermocouple leads were inadvertently crossed at installation, what would the cylinder temperature gauge pointer indicate?
Moves off scale on the zero side of the meter
Which of the following types of combustion sections are used in aircraft turbine engines?
Multiple-can, annular, and can-annular
In a dual axial flow compressor the first stage turbine drives?
N2 compressor
In the dual axial flow or twin spool compressor system, the first stage turbine drives the?
N2 compressor
In which part of the cylinder walls of a normally operating engine will the greatest amount of wear occur?
Near the top of the cylinder
Air pressure within the inlet of an installed turbojet engine being operated in place on the ground is?
Negative
(1) Preignition is caused by improper ignition timing. (2) Detonation occurs when an area of the combustion chamber becomes incandescent and ignites the fuel/air mixture in advance of normal timed ignition. Regarding the above statements,
Neither is true
1.) welding and straightening of turbine engine rotating airfoils does not require special equipment 2.) welding and straightening of turbine engine rotating airfoils is commonly recommended by the manufacturer Regarding the above statements?
Neither is true
The basic gas turbine engine is divided into two main sections: the cold section and the hot section 1.) the cold section includes the engine inlet, compressor, and turbine sections 2.) the hot section includes the combustion, diffuser, and exhaust sections Regarding the above statements?
Neither is true
After spark plugs from an opposed engine have been serviced, in what position should they be reinstalled?
Next in firing order to the one from which they were removed and swapped bottom to top.
Some cylinder barrels are hardened by?
Nitriding
Under which of the following conditions will the trimming of a turbine engine be most accurate?
No wind and low moisture
What is the smallest terminal stud allowed for aircraft electrical power systems?
No. 10
Where would a carburetor air heater be located in a fuel injection system?
None is required
Using a cold spark plug in a high compression aircraft engine would probably result in?
Normal operation
After making a welded repair to a pressurized type turbine engine oil tank, the tank should be pressure checked to?
Not less than 5 psi plus the maximum operating pressure of the tank
Straightening nitrided crankshafts is?
Not reccomended
In an aircraft turbine engine, operating at a constant power, the application of engine anti icing will result in?
Noticeable shift in EPR
Which statements are true regarding aircraft engine propulsion? 1.) an engine driven propeller imparts a relatively small amount of acceleration to a large mass of air 2.)turbojet and turbofan engines impart a relatively large amount of accceleration to a smaller mass of air 3.) in modern turboprop engines, nearly 50% of the exhaust gas energy is extracted by turbines to drive the propeller and compressor with the rest providing exhaust thrust?
Number 1 and 2 are true
The compression ratio of an axial flow compressor is a function of the?
Number of compression stages
What is the primary factor which controls the pressure ratio of an axial flow compressor?
Number of stages in compressor
Prior to performing engine trimming, you should?
Obtain a true temperature reading comparable to that of the air that enters the engine
The EGT gauge used with reciprocating engines is primarily used to furnish temperature readings in order to?
Obtain the best mixture setting for fuel efficiency
The primary purpose in setting proper valve timing and overlap is to?
Obtain the best volumetric efficiency and lower cylinder operating temperatures
Excessive oil is prevented from accumulating on the cylinder walls of a reciprocating engine by?
Oil control rings on the pistons
Where is the oil of a dry sump reciprocating engine exposed to the temperature control valve sensing unit?
Oil cooler inlet
Where is the oil temperature bulb located on a dry sump reciprocating engine?
Oil inlet line
During a 100 hour inspection for starter generators what are the two inspection requirements?
Oil leakage and commutator wear and pitting
Inspection of pneumatic starters by maintenance technicians usually includes checking the?
Oil level and magnetic drain plug condition
Constant-speed non-feathering McCauley, hartzell, and other propellers of similar design without counterweights increase pitch angle using?
Oil pressure
What unit in an aircraft engine lubrication system is adjusted to maintain the desired system pressure?
Oil pressure relief valve
During a 100 hour inspection what must be checked/performed?
Oil screen check
What is likely to occur if a reciprocating engine is operated at high power settings before it is properly warmed up?
Oil starvation of bearings and other parts.
What prevents pressure within the lubricating oil tank from rising above or falling below ambient pressure?
Oil tank vent
In a jet engine which uses a fuel oil heat exchanger, the oil temperature is controlled by a thermostatic valve that regulates the flow of?
Oil through the heat exchanger
The propeller governor controls the?
Oil to and from the pitch changing mechanism
What will result if an oil filter becomes completely blocked?
Oil will flow at the normal rate through the system
How may it be determined that a reciprocating engine with a dry sump is pre oiled sufficiently?
Oil will flow from the engine return line or indicator port.
Hot section inspections for many modern turbine engines are required?
On a time or cycle bases
In the aircraft magneto system, if the p lead is disconnected, the magneto will be?
On regardless of ignition switch position
On twin engine aircraft with fuel injected reciprocating engines, one fuel flow indicator reads considerably higher than th either in all engine operating configurations. What is the probably cause of this indication?
One or more fuel nozzles is clogged
A nine cylinder radial engine, using multiple point priming system with a central spider, will prime which cylinders?
One, two, three, eight, and nine.
Starter brushes should be replaced when they are worn to?
One-half the original length
When a "shower of sparks" ignition system is activated at an engine starter, a spark plug fires?
Only while both the retard and advance breaker points are open
When the switch is off ina. Battery ignition system, the primary circuit is?
Opened
Which of the following factors help determine the proper grade of oil to use in a particular engine?
Operating speeds of bearings
When the leading edge of a first stage turbine blade is found to have stress rupture cracks, which of the following should be suspected?
Over temperature conditions
A continuous loop fire detector is what type of detector?
Overheat detector
After firing in aircraft engines may be caused by?
Overly rich fuel mixture,faulty spark plugs, defective fuel injection nozzles, and incorrect valve clearance
When the centrifugal force acting on the propeller governor flyweights overcomes the tension on the speeder spring, a propeller is in what speed condition?
Overspeed
In order to replace the possibility of ground shorting the circuits when the connectors are separated for maintenance, the AN and MS electrical connectors should be installed with the?
Pin section on the ground side of the electrical circuit
When installing a magneto on an engine, the?
Piston in the no.1 cylinder must be a prescribed number of degrees before top center on the compression stroke
If air is heard coming from the crankcase breather or oil filler during a differential compression check, what is this an indication of?
Piston ring leakage
What is the source of most of the heat that is absorbed by the lubricating oil in a reciprocating engine??
Pistons and cylinder walls.
A fixed pitch wooden propeller that has been properly installed and the attachment bolts properly torqued exceeds the out of track allowance by 1/16". The excessive out of track condition may be corrected by?
Placing shims between the inner flange and the propeller
Which of the following bearing types must be continuously lubricated by pressure oil?
Plain
Which type of bearings are generally used for connecting rods and cam shafts?
Plain
The propeller blade angle is defined as the acute angle between the airfoil section chord line (at the blade reference station) and which of the following?
Plane of rotation
A method commonly used to prevent carburetor icing is to?
Preheat the intake air
What will be the result in using too hot of a spark plug?
Preignition
Grinding the valves of a reciprocating engine to a feather edge is likely to result in?
Preignition and burned valves
In a has turbine engine, combustion occurs at a constant?
Pressure
A bourdon tube instrument may be used to indicate?
Pressure and temperature
The Brayton cycle is known as the constant?
Pressure cycle
In a reciprocating engine, oil is directed from the pressure relief valve to the inlet side of the?
Pressure pump
An advantage of the centrifugal flow compressor is its high?
Pressure rise per stage
The valve assemblies of opposed reciprocating engines are lubricated by means of a ?
Pressure system
What are the positions of the pressurization valve and the dump valve in a jet engine fuel system when the engine is shut down?
Pressurization valve closed, dump valve open.
A complete break in the line between the manifold pressure gauge and the induction system will be indicated by the gauge registering?
Prevailing atmospheric pressure
The function of the altitude compensating or aneroid valve used with the teledyne continental fuel injection system on many turbocharged engines is to?
Prevent an overly rich mixture during sudden acceleration
It is necessary to control acceleration and deceleration rates in turbine engines in order to?
Prevent blowout or die out
Compressor field cleaning on a turbine engine is performed primarily in order to?
Prevent engine performance degradation, increased fuel costs, and damage or corrosion to gas path surfaces
The purpose of an engine/inlet anti-ice system is primarily to?
Prevent ice formation in engine and/or inlet areas
Shielding is used on spark plug ignition wires to?
Prevent interference with radio reception
The purpose of a relief valve installed in the tank venting system of a turbine engine oil tank is to?
Prevent oil pump cavitation by maintaining a constant pressure on the oil pump inlet
Manufacturers normally require turbine engine oil servicing within a short time after engine shutdown primarily to?
Prevent over servicing
Aircraft copper electrical wire is coated with tin, silver, or nickel in order to?
Prevent oxidation
It is desirable that fuel lines have a gentle slope upward or downward and not have sharp curves or sharp rises or falls in order to?
Prevent vapor lock
The spark occurs at the spark plug when the ignitions?
Primary circuit is broken
The secondary coil of a magneto is grounded through the?
Primary coil
An aircraft engine equipped with a pressure type carburetor is started with the?
Primer while the mixture control is positioned in the idle cutoff
Cam ground pistons are installed in some aircraft engines to ?
Provide a better fit at operating temperatures
Some larger recipricating engines use a compensating oil pressure relief valve to?
Provide a high engine oil pressure when the oil is cold and automatically low the oil pressure when the oil warms up
On a float type carburetor, the purpose of the economizer valve is to?
Provide a richer mixture and cooling at maximum power output
Some aircraft engine manufacturers equip their products with cloaked or taper ground cylinders in order to?
Provide a straight cylinder bore at operating temperatures
The oil dampened main bearing utilized in some turbine engine is used to?
Provide an oil film between the outer race and the bearing housing in order to reduce vibration tendencies in the rotor system, and to allow for slight missalignment
The primary concern in establishing the firing order for an opposed engine is to?
Provide balance and eliminate vibration to the greatest extent possible
On APU's equipped with a free turbine and load compressor, the primary function of the load compressor is to?
Provide bleed air for aircrafts pneumatic systems
Aircraft magneto housings are usually ventilated in order to?
Provide cooling and remove corrosive gases produced by normal arcing
The undersides of pistons are frequently finned, the principle reason is to?
Provide for greater heat transfer to the engine oil
The purpose of directing bleed air to the outer turbine case on some engines is to?
Provide optimum turbine blade tip clearance by controlling thermal expansion
What is the primary purpose of the oil breather pressurization system that is used on turbine engines?
Provides a proper oil spray pattern from the main bearing oil jets.
What are the principle advantages of the duplex fuel nozzle used in many turbine engines?
Provides better atomization and uniform flow pattern
Some engine manufacturers of twin spool gas turbine engines identify turbine discharge pressure in their maintenance manuals as?
Pt7
An engine lubrication system pressure relief valve is usually located between the?
Pump and internal oil system
Pneumatic starters are usually designed with what type of airflow impingement systems
Radial inward flow turbine and axial-flow turbine
The distance that is one half of the diameter of a circle is?
Radius
The amount of voltage generated in any magneto secondary coil is determined by the number of windings and the?
Rate of collapse of the magnetic field around the primary coil
What is indicated when the front cone bottoms while installing a propeller?
Rear cone should be moved forward
How does high tension ignition shielding tend to reduce radio interference?
Receives and grounds high-frequency waves coming from the magneto and high-tension ignition leads.
The part of a dc alternator power system that prevents reverse flow of current from the battery to the alternator is the?
Rectifier
What is the basic operational sequence for reducing the power output of an engine equipped with a constant speed propeller?
Reduce the manifold pressure, then the RPM.
The centrifugal twisting moment of an operating propeller tends to?
Reduce the pitch angle
What is an advantage of using metallic-sodium filled exhaust valves in aircraft recip engines?
Reduce valve operating temperatures
A purpose of the shrouds on the turbine blades of an axial flow engine is to?
Reduce vibration
If a blade of a particular metal propeller is shortened because of damage to the tip, the remaining blade must be?
Reduced to conform with the shortened blade
Which of the following is NOT a function of the carburetor venturi?
Regulates the idle system
Which of the following best describes the functions of an altitude mixture control?
Regulates the richness of the fuel/air charge entering the engine
The purpose of the back suction mixture control in a float type carburetor is to adjust the mixture by?
Regulating the pressure on the fuel in the float chamber
The angle of attack of a rotating propeller blade is measures between the blade chord or face and which of the following?
Relative airstream
On ground, the feather position may be accomplished how?
Release oil pressure
Fuel pressure produced by the engine driven fuel pump is adjusted by the?
Relief valve adjusting screw
In order to relieve excessive pump pressure in an engines internal oil system, most engines are equipped with a?
Relieve valve
As the generator load is increased (within its rated capacity) the voltage will?
Remain constant and the amperage output will increase
During engine operation at speeds lower than those for which the constant speed propeller control can govern in the increase RPM position, the propeller will?
Remain in the full LOW PITCH position
When lubricating a hartzell propeller blade with grease, to prevent damage to the blade seals, the service manual may reccomend on some models to?
Remove one of the two zero fittings for the blade and grease the blade though the remaining fitting
What corrective action should be taken when a carburetor is found to be leaking fuel from the discharge nozzle?
Replace the needle valve and seat
Which of the following will be caused by excessive valve clearance of a cylinder on a recipricating engine?
Rescue valve overlap period
The viscosity of a liquid is a measure of its?
Resistance to flow
The reason for flashing the field in a generator is to?
Restore residual magnetism to the field frame
What is the proper operating sequence when using thrust reversers to slow an aircraft after landing?
Retard thrust levers to ground idle, raise thrust reverser levers as required, and retard thrust reverser levers to ground idle.
On some turboprop engines at shutdown, the propeller blades are prevented from rotating into the feather position by what?
Retractable pitch stops
What must be done after the fuel control unit has been replaced on an aircraft gas turbine engine?
Retrim the engine
What unit in the propeller anti-icing system controls the output of the pump?
Rheostat
An aircraft carburetor is equipped with a mixture control in order to prevent the mixture from becoming too?
Rich at high altitudes
If the main air bleed of a float-type carburetor becomes clogged, the engine will run?
Rich at rated power
If an aircraft engine is equipped with a carburetor that is not compensated for altitude and temperature variations, the fuel/air mixture will become?
Richer as either the altitude or temperature increases.
A punctured float in a float type carburetor will cause the fuel level to?
Rise, and enrich the mixture
Most large aircraft reciprocating engines are equipped with which of the following types of engine driven fuel pumps?
Rotary-vane-type fuel pump.
What component of a dual magneto is shared by both ignition switches?
Rotating magnet
What components make up the magnetic system of a magneto?
Rotating magnet, the pole shoes, the pole shoe extensions, and the coil core.
Which two elements make up the axial flow compressor assembly?
Rotor and stator
Operating thrust reversers at low ground speeds can sometimes cause?
Sand or other foreign object ingestion, hot gas-reingestion, and compressor stalls.
In a low tension ignition system, each spark plug requires an individual?
Secondary coil
In a turbine engine with dual spool compressor, the low speed compressor?
Seeks its own best operating speed
What type of igniter plug is used in the low tension ignition system of an aircraft turbofan engine?
Self-ionizing or shunted-gap type plug.
The purpose of a dwell chamber in a turbine engine oil tank is to provide?
Separation of entrained air from scavenged oil
Electric motors are often classified according to the method of connecting the field coils and armeture, aircraft engine starter motors are generally of which type?
Series
When trimming a turbine engine, the fuel control is adjusted to?
Set idle RPM and maximum speed or EPR
Most engine propeller combinations have one or more critical ranges within which continuous operation is not permitted, critical ranges are established to avoid?
Severe propeller vibration
During a 100 hour inspection of a starter/generator what is NOT an inspection item?
Shaft bearing condition
Repairs of aluminum alloy adjustable pitch propellers are not permitted to be made on which of the following blade areas?
Shank
What methods is/are used to provide clean air to the engines of helicopters and turboprop airplanes that have particle (sand and ice) separators installed?
Sharp airflow directional change to take advantage of inertia and/or centrifugal force, and filters or engine inlet screens.
A characteristic of dyna focal engine mounts as applied to aircraft reciprocating engines is that the?
Shock mounts point toward the engines center of gravity
When is the fuel/air mixture ignited in a conventional recipricating engine?
Shortly before the piston reaches the top of the compression stroke
Low oil pressure can be detrimental to the internal engine components. However high oil pressure?
Should be limited to the engine manufacturers recommendations
The blending of blades and vanes in a turbine engine?
Should be performed parallel to the length of the blade using smooth contours to minimize stress points
Reduced blade vibration and improved airflow characteristics in gas turbines are brought about by?
Shrouded turbine rotor blades
How may reciprocating engine exhaust system leaks be detected?
Signs of exhaust soot inside the cowling and on adjacent components
To prevent seizing of the igniter plugs, the threads in many cases are?
Silver plated
Why is a constant speed drive used to control the speed of some aircraft engine driven generators?
So that the frequency of the alternating current output will remain constant.
What type of lubricant may be used to aid in pulling electrical wires or cables through conduit?
Soapstone talc
The magnetic circuit of a magneto consists of a permanent multi pole magnet, the core is made of?
Soft iron
A suitable substitute for brass nuts on exhaust systems?
Soft steel nuts
Which of the following is used to correct horizontal unbalance of a wood propeller?
Solder
The desired engine idle speed and mixture setting?
Is adjusted with engine warmed up and operating
As a general rule, a small amount of fuzzy particles or gray metallic paste on a turbine engine magnetic chip detector?
Is considered to be the result of normal wear
The pumping capacity of the scavenger pump in aDry sump aircraft engines lubrication system?
Is greater than the capacity of the oil supply pump
The metered fuel pressure (chamber C) is an injection in an injection type carburetor?
Is held constant throughout the entire engine operating range
According to the electron theory of the flow of electricity, when a properly functioning dc alternator and voltage regulating system is charging an aircrafts battery, the direction of current flow though the battery?
Is into the negative terminal and out of the positive terminal
Repair of exhaust system components?
Is not reccomended to be accomplished in the field
The blade angle of a fixed pitch propeller ?
Is smallest at the tip
Why does one type of fenwal fire detection system use spot detectors wires in parallel between two separate circuits?
Is that a single fault may exsist without sounding a false alarm
The constant current method of charging a ni-cad battery?
Is the method most effective in maintaining cell balance
An aircrafts propeller system beta range?
Is used to produce zero or negative thrust
What is the purpose of a slip joint in an exhaust collector ring?
It aids in alignment and absorbs expansion
What is a function of the idling air bleed in a float type carburetor?
It aids in emulsifying/vaporizing the fuel at idle speeds.
Which of the following best describes the function of an automatic mix control?
It compensates for the change in air density due to temperature and altitude
Which of the following is a function of the differential pressure controller?
It controls all positions of the waste gate except at the fully open position
Which of the following statements regarding volumetric efficiency of an engine is true?
It is possible to exceed 100 percent volumetric efficiency of some engines by the use of superchargers of the proper type.
What is the purpose of a reverse current cutout relay?
It opens the main generator circuit whenever the generator voltage drops below the battery voltage.
Which statement is correct concerning thermocouple type temperature indicating instrument systems?
It requires no outside power source
What is the characteristic of a centrifugal type fuel boost pump?
It separates air and vapor from the fuel
The economizer system of a float type carburetor performs which of the following functions?
It supplies and regulates the additional fuel required for all engine speeds above cruising.
How does the aerodynamic twisting force affect the operating propeller blades?
It tends to turn the blades to a high blade angle
How will the mixture of an engine be affected if the bellows of the automatic mixture control (AMC) in a pressure carburetor ruptures while the engine is operating at altitude?
It will become richer
Spark plug heat range is determined by?
It's ability to transfer heat to the cylinder head
Upon what quality or characteristic of a lubricating oil is its viscosity index bases?
It's rate of change in viscosity with temperature change.
A spark plug is fouled when?
It's spark grounds without jumping electrodes
If fuel/air ratio is proper and ignition timing is correct, the combustion process should be completed when?
Just after top center at the beginning of the power stroke
The main oil filters strain the oil at which point in the system?
Just as it leaves the pressure pump
When will the voltage in the secondary winding of a magneto, installed on a normally operating engine, be at its highest value?
Just prior to spark plug firing
What precaution is usually taken to prevent electrolyte from freezing in a lead acid battery?
Keep the battery fully charged
Kerosene is used as turbine engine fuel because?
Kerosene has more heat energy per gallon and lubricated fuel system components
The fire detection system that used two wires imbedded in a ceramic core within a tube is the?
Kidde system
Two continuous loop fire detection systems that will not test due to a broken detector element are the?
Kidde system and the fenwal system
For takeoff, a constant speed propeller is normally set in the?
LOW PITCH, high RPM position
Main bearing out seals used with turbine engines are usually what type?
Labyrinth and/or carbon rubbing
Magneto pole shoes are generally made of?
Laminations of high grade soft iron
The oil used in reciprocating engines has a relatively high viscosity due to?
Large clearances and high operating temperatures
Bell mouth inlets are typically not used on high speed aircraft for what reason?
Large size creates too much drag
Which of the following maybe used to mark turbine engine component exposed to high temperatures?
Layout dye
All of the following are reccomended markers for reciprocating engine exhaust systems except?
Lead pencil
Which of the following would most likely cause a reciprocating engine to backfire through the induction system at low rpm operation?
Lean mixture
A bent cooling fin on an aluminum cylinder head should be?
Left alone if no crack is found
The rearward thrust capability of an engine with the thrust reverser system deployed is?
Less than its forward capability
The purpose of a sonic venturi on a turbocharged engine is to?
Limit the amount of air that can flow from the turbocharged into the cabin for pressurization
What is the purpose of the density controller in a turbocharger system?
Limits the maximum manifold pressure that can be produced by the turbocharger at full throttle
A fire detection system operates on the principle of buildup of gas pressure within a tube proportional to temperature. Which of the following systems does this statement define?
Lindberg continuous-element system.
The term "reach" as applied to spark plug design and or type indicates the?
Linear distance from the shell gasket seat to the end of the threads on the shell skirt
Which of the following would not be a method of engine cooling?
Liquid
Reciprocating engine exhaust systems that have repairs or sloppy weld beads which protrude internally are unacceptable because they cause?
Local hot spots
Ball joints in reciprocating engine exhaust systems should be?
Loose enough to permit some movement
A carburetor air pre heater is not generally used on takeoff unless absolutely necessary because of the?
Loss of power an possible detonation
Which condition would be the least likely to be caused by failed or failing engine bearings?
Low oil temperature
Which of the following best describes the blade movement of a propeller that is in the high RPM position when reversing action has begun?
Low pitch directly to reverse pitch
Which of the following best describes the blade movement of a feathering propeller that is in the HIGH RPM position when the feathering action is begun
Low pitch through high pitch to feather position.
The fan rotational speed of a dual axial compressor forward fan engine is the same as the?
Low pressure compressor
Some high volume turboprop and turbojet engines are equipped with two spool or split compressors. When these engines operate at high altitude, the?
Low pressure rotor will increase in speed as the compressor load decreases in the lower density air
The advantages of using synthetic oil over petroleum oil are?
Low volatility Low pour point High viscosity index Good lubricating qualities Low coke and lacquer formation Low foaming
Which of the following would indicate a general weak engine condition when operated with a fixed pitch propeller or test club?
Lower than normal static RPM, full throttle operation.
At cruise RPM, some oil will flow through the relief valve of a gear type engine oil pump. This is normal as the relief valve is set at a pressure which is?
Lower than the pressure pump capabilities
To prevent seizing of the igniter plug, the threads in many cases are?
Lubricated with an anti seize compound
The most common method and generally the best conduction of heat form the inside of a cylinder barrel to cooling air is accomplished by?
Machining fins directly on the outside of the barrel
Which of the following are distinct circuits of a high tension magneto?
Magnetic, primary, and secondary
If new breaker points are installed in a magneto on an engine, it will be necessary to time the?
Magneto internally and the magneto to the engine
Alignment of the marks provided for internal timing of a magneto indicated that the?
Magneto is in E gap position
If a spark plug leads becomes grounded the?
Magneto will not be affected
When timing a magneto internally, the alignment of the timing marks indicated that the?
Magnets are in the E-gap position
If an engine is equipped with a float type carburetor and the engine runs excessively rich at full throttle, a possible cause of the trouble is a clogged?
Main air bleed
Fuel cross feed systems are used in aircraft to?
Maintain aircraft stability
When engine power is increased, the constant speed propeller tries to function so that it will?
Maintain the RPM, increase the blade angle, and maintain a low angle of attack
Removal of propeller blade tips within Type Certificate Data Sheet limits when correcting a defect is
Major repair
The purpose of permanently sealing and partially filing some models of McCauley propeller hubs with dyed oil is to?
Make a location of cracks readily apparent
Hot spots in the combustion section of a turbojet engine are possible indications of?
Malfunctioning fuel nozzles
The components of a centrifugal compressor section consists of the impeller, diffuser, and?
Manifold
To reduce the power output of an engine equipped with a constant speed propeller and operating near maximum BMEP, the?
Manifold pressure is reduced with the throttle control before the RPM is reduced with the propeller control
Which of the following contains approved data for performing a major repair or an aircraft engine?
Manufacturers maintenance instructions when FAA approves
Which bearing is least likely to be a roller or ball bearing?
Master rod bearing (radial engine).
Which of the following aircraft circuits does not contain a fuse/circuit breaker?
Starter circuit
When the starter switch to the aircraft gas turbine engine starter generator is energized and the engine fails to rotate, one of the probable causes would be the?
Starter solenoid is defective
What is the proper starting sequence for a turbojet engine?
Starter, ignition, fuel
What is the major function of the turbine assembly in a turbojet engine?
Supplied power to the compressor
If the oil in the oil cooler core and annular jacket becomes congealed, what unit prevents damage to the cooler?
Surge protection valve
When a magneto is operating, what is the probably cause for a shift in internal timing
The cam follower wear and/or the breaker points wear
Which of the following statements concerning a centrifugal type fuel boost pump located in a fuel supply tank is NOT true?
The centrifugal-type pump is classified as a positive displacement pump.
The diffuser section of a jet engine is located between?
The compressor section and the burner section
A certain direct current series motor mounted within an aircraft draws more amperes during starting than when it is running under its rated load. The most logical conclusion that may be drawn is?
The condition is normal for this type of motor
Which of the following types of electric motors are commonly used in electric tachometers?
Synchronous Motors
In an airplane equipped with an alternate air system, if the main air duct air filter becomes blocked or clogged?
System will automatically allow warm, unfiltered air to be drawn into the engine
Which of the following is a primary engine instrument?
Tachometer
What indications may shift when a turbofan engine anti-icing (bleed air) system is turned on?
Tachometer, EGT, and EPR
A fuel strainer or filter must be located between the?
Tank outlet and the fuel metering device
Which of the following has the greatest effect on the viscosity of lubricating oil?
Temperaure
What is the purpose of the carburetor accelerating pump?
Temporarily enrich the mixture when the throttle is suddenly opened
The constrained gap igniter plug used in some gas turbine engines operated at a cooler temperature because?
The construction is such that the spark occurs beyond the face of the combustion chamber liner
A high surge of current is required when a dc electric motor is first started. As the speed of the motor increases?
The counter emf builds up and opposes the applied emf, thus reducing the current flow through the armeture
Generally, when removing a turbine engine igniter plug, in order to eliminate the possibility of the technician receiving lethal chock, the ignition switch is turned off and?
The igniter lead is disconnected from the plug and the central electrode grounded to the engine after disconnecting the transformer-exciter input lead and waiting the prescribed time
What is the relationship between the accelerating pump and the enrichment valve in a pressure injection carburetor?
The pressure is inversely proportional to the velocity
If a flanged propeller shaft has dowel pins?
The propeller can only be installed in a given position
If propeller cones or hub cone seats show evidence of galling and wear, the most likely cause is?
The propeller retaining nut was not tight enough during previous operation
What will happen to the return oil if the oil line between the scavenger pump and the oil cooler separates?
The return oil will be pumped overboars
Which statement is true regarding thrust reverser systems?
The reverser system must be able to withstand high temperatures, be mechanically strong, relatively light weight, and reliable
Jet engine turbine blades removed for detailed inspection must be installed in?
The same slot
The engine oil operating temperature regulator is usually located between which of the following on a dry sump engine?
The scavenge pump outlet and the oil storage tank
At what rpm is a reciprocating engine ignition switch check made?
The slowest possible rpm
What determines the minimum particle size which will be excluded or filtered by a Cuno type (stacked disk, edge filtration) filter?
The spacer thickness
Upon what is the output frequency of an ac generator (alternator) depend?
The speed of rotation and the number of field points
In the event a pneumatic start valve will not operate and the manual override must be used, the starter T handle must be closed at scheduled starter drop out because?
The starter will over speed at a give n2
Which of the following is regulated in a generator to control its voltage output?
The strength of the field
The resistance of the current return path through the aircraft is always considered negligible provided ?
The structure is adequately bonded
Which statement is correct regarding the ignition system of a turbine engine?
The system is normally de-energized as soon as the engine starts
Which of the following fire detection systems uses heat in the normal testing of the system?
The thermocouple system and the Lindbergh system
If all other requirements are met, what type of oil should be used to achieve theoretically perfect engine lubrication?
The thinnest oil that will stay in place and maintain a reasonable film strength
What unit in a tachometer system sends information to the indicator?
The three-phase ac generator.
Which statement is true regarding proper throttle rigging of an airplane?
The throttle stop on the carburetor must be contacted before the stop in the cockpit
You are performing a 100 hour inspection on a R985-22 aircraft engine. What does the 985 mean?
The total piston displacement of the engine
The abreviation "p" with subscript t7 used in turbine engine terminology means?
The total pressure at station no.7
Which of the following is most likely to occur if an overhead valve engine is operated with inadequate valve clearances?
The valves will not seat positively during start and engine warmup.
If the hot clearance is used to set the valves when the engine is cold, what will occur during operation of the engine?
The valves will open late and close early.
Which statement is true regarding a thermocouple type cylinder head temperature measuring system?
The voltage output of a thermocouple system is determined by the temperature difference between the two ends of the thermocouple.
Fire fire detection and extinguishing purposes, aircraft powerplant areas are divided into fire zones based on?
The volume and smoothness of the airflow through the engine compartments
Select a characteristic of a good weld on exhaust stacks?
The weld should taper off smoothly into the base metal
Float type carburetors which are equipped with economizer are normally set for?
Their leanest practical mixture delivery at cruising speeds and enriched by means of the economizer system at higher power settings
The low pitch stop on a constant speed propeller is usually set so that?
Then engine will turn at its rated takeoff RPM at sea level when the throttle is opened to allowable takeoff manifold pressure
What are two types of ac motors that are used to produce a relatively high torque?
Three phase and capacitor start
The device that controls the volume of the fuel/ air mixture to the cylinders is called a?
Throttle valve
How is the oil collected on the piston oil ring returned to the crankcase?
Through holes drilled in the piston oil ring groove
What operational force tends to bend the propeller blades forward at the tip?
Thrust bending force
What tool is generally used to measure the crankshaft rotation in degree?
Timing disk
What is the functions of a fire detection system?
To activate warning devices in the event of a powerplant fire
What is the purpose of an augmenter used in some reciprocating engine exhaust systems?
To aid in cooling the engine
What is the basic purpose of the three small holes (no.60 drill) in the tipping of wood propeller blades?
To allow the moisture which may collect between the tipping and the wood to escape (vent the tipping)
What is the function of the automatic propeller synchronizing system on multi engine aircraft?
To control engine RPM and reduce vibration
What is the purpose of a power check in a recipricating engine?
To determine satisfactory performance
What is the purpose of a safety gap in some magnetos?
To discharge the secondary coil's voltage if an open occurs in the secondary circuit.
What is the purpose of installing two or more springs on each valve in an aircraft engine?
To eliminate valve spring vibration or surge
What is the principle advantage of using propeller reduction gears?
To enable engine rpm to be increased with an accompanying increase in power and allow the propeller to remain at a lower, more efficient RPM
Why d some turbine engines have more than one turbine wheel attached to a single shaft?
To extract more power from the exhaust gases than a single wheel can absorb
What is the purpose of last chance oil filters>
To filter the oil immediately before it enters the main bearings.
Why do turbine engine ignition systems require high energy
To ignite the fuel under conditions of high altitude and low temperatures.
What is the purpose of the diffuser section in a Turbine engine?
To increase pressure and reduce velosiy
For what primary purpose is a turbine engine fuel control unit trimmed?
To obtain maximum thrust output when desired
What is the purpose of an engine-driven fuel pump bypass valve?
To prevent a damaged or inoperative pump from blocking the fuel flow of another pump in series with it.
What is the purpose of an exhaust outlet guard on a small reciprocating engine?
To prevent dislodged muffler baffles from obstructing the muffler outlet
What is a constant speed counterweight propeller normally placed in full high pitch position before the engine is stopped?
To prevent exposure and corrosion of the pitch changing mechanism
What is the primary purpose of the metal tipping which covers the blade tips and extends along the leading edge of each wood propeller blades?
To prevent impact damage to the tip and leading edge of the blade
Why is an aircraft reciprocation engine oil tank on a dry sump location system equipped with a vent line?
To prevent pressure buildup in the tank
What is the purpose of the check valve generally used in a dry sump lubrication system?
To prevent the oil from the supply tank from seeping into the crankcase during inoperative periods.
What is the purpose of the safety circlet installed on some valve stems?
To prevent valves from falling into the combustion chamber
What is the purpose of using an impulse coupling with a magneto?
To produce a momentary high rotational speed of the magneto.
Fuel boost pumps are operated?
To provide a positive flow of fuel to the engine
Why are fixed orifice nozzles used in lubricating systems of gas turbine engines?
To provide a relatively constant flow of oil to the main bearings at all engine speeds
The fifth trigger coil in the dual ignition circuit of a rotating 914 engine is used?
To provide the revolution counter signal
Why are high tension ignition cables frequently routed from the distributor to the spark plugs in flexible metallic conduits?
To reduce the effect of the high frequency electromagnetic waves emanated during operation
What is the primary purpose of the hopper located in the oil supply tank of some dry sump engine installations?
To reduce the time required to warm the oil to operating temperatures.
What is the function of the stator vane assembly at the discharge end of a typical axial flow compressor?
To straighten airflow to eliminate turbulance
What is the purpose of an arbor used in balancing a propeller?
To support the propeller on the balance knives
The purpose of a bleed air valve, located in the beginning stages of the compressor in an aircraft gas turbine engine is?
To vent some of the air overboard to prevent a compressor stall
A reciprocating engine with a fuel/air ratio at more than than 15 parts air to 1 part fuel by weight is?
Too lean to fly
Which of the following defects would likely cause a hot spot on a reciprocating engine cylinder?
Too much cooling fin area broken off
What is meant by a 1:15 air/fuel ratio?
Too rich to fly
If an engine cylinder is to be removed, at what position in the cylinder should the piston be?
Top dead center
What operational force causes propeller blade tips to lag in the opposite direction of rotation?
Torque bending force
Turboprop engines indicate power produces using measurements by a?
Torque meter
Which of the following generally renders an aluminum alloy propeller unrepairable?
Transverse cracks of any size
Oil picks up the most heat from which of the following turbine engine components?
Turbine bearings
Dirt particles in the air being introduced into the compressor of a turbine engine will form a coating on all but which of the following?
Turbine blades
What would be the possible cause if a gas turbine engine has high EGT, high fuel flow and low rpm at all engine power settings?
Turbine damage or loss of turbine efficiency
The highest heat to metal contact in a jet engine is the?
Turbine inlet guide vanes
The exhaust gas temperature (EGT) indicator on a gas turbine engine provides a relative indication of the?
Turbine inlet temperature
What instrument on a gas turbine engine should be monitored to minimize the possibility of a hot start?
Turbine inlet temperature
Which of the following engine variables is the most critical during turbine engine operation?
Turbine inlet temperature
Which of the following is the ultimate limiting factor of turbine engine operation?
Turbine inlet temperature
Which of the following factors affect the thermal efficiency of a turbine engine?
Turbine inlet temperature, compression ratio, and turbine and compressor efficiency
A gas turbine engine comprises of which three main sections?
Turbine, compressor, and combustion
In an axial flow turbine engine, compressor bleed air is sometimes used to aide in cooling the ?
Turbine, vanes, blades, and bearings
When selecting a powerplant for an aircraft that will cruise from 180 - 350 MPH, which engine would perform best?
Turboprop
Generally, the practice when trimming an engine is to?
Turn all accessory bleed air off
What should be done initially if a turbine engine catches fire when starting?
Turn off fuel and continue engine rotation with the starter
The purpose of cascade vanes in a thrust reverser system is to?
Turn to a forward direction the fan and/or hot exhaust gases that have been blocked from exiting through the exhaust nozzle
Which of the following are included in a typical turbine engine ignition system?
Two igniter plugs, one exciter unit, two high-tension igniter leads.
Each powerplant installed on an airplane with a standard airworthiness certificate must have been?
Type certificated
What is the speed condition of a propeller in beta range?
Under speed
The pressure between the turbocharger and the throttle valve is called?
Upper deck pressure
Which of the following conditions would most likely lead to detonation?
Use of fuel with too low an octane rating.
How should corrosion resistant steel parts such as exhaust collectors be blast cleaned?
Use sand which has not previously been used on iron or steel
One of the best ways to increase engine power and control detonation and preignition is to?
Use water injection
The air passing through the combustion chamber of a turbine engine is?
Used to support combustion and cool the engine
The primary difference between the four stroke cycle and the diesel cycle aircraft engine is that a diesel cycle:
Uses high compression pressures to ignite the fuel
Which type of pump is commonly used as a fuel pump on reciprocating engines?
Vane
Fuel lines are kept away form sources of heat, sharp bends and steep rises are avoided to reduce the possibility of?
Vapor lock
What is used in turbine engines to air in stabilization of compressor airflow during low thrust engine operations?
Variable guide vanes and or compressor bleed valves
The back suction mixture control system operates by?
Varying the pressure acting on the fuel in the float chamber
When air passes through the Venturi of a carburetor, what three changes occur?
Velocity increases, temperature decrease, and pressure decreases
Power recovery turbines used on some reciprocating engines are driven by the?
Velocity of exhaust gases
What carburetor component limits the maximum airflow into the engine at full throttle?
Venturi
What carburetor component measures the amount of air delivered to the engine?
Venturi
What type of imbalance will cause a two bladed propeller to have a persistent tendency to come to rest in a horizontal position (with blades parallel to the ground) while being checked on a propeller balancing beam?
Vertical
After proper removal of aluminum blade damage, the affected surface should be polished with?
Very fine sandpaper or crocus cloth
The time in seconds required for exactly 60 cubic centimeters of oil to flow through an accurately calibrated orifice at a specific temperature is recorded as a measure of the oils?
Viscosity
On a reciprocating engine aircraft using a shrouded exhaust muffler system as s source for cabling heat, the exhaust system should be?
Visually inspected for any indication of cracks or an operational carbon monoxide detection test should be done
Electrical switches are rated according to the?
Voltage and current they can control
Surface treatment to counter the effects of dye penetrant inspection on a propeller is accomplished by?
Washing off with solvent
What directly regulates the speed of a turbocharger?
Waste gate
Arcing at the brushes and burning of the commutator of a motor may be caused by?
Weak brush springs
Sharp bends should be avoided in ignition leads primarily because?
Weak points may develop in the insulation though which high tension current can leak
Magneto timing drift is caused by erosion of the breaker points and?
Wear of the cam followers
Aircraft wire size is determined using a?
Wire gauge
Electrical circuit protection devices are installed primarily to protect the?
Wiring
During overhaul, reciprocating engine exhaust valves are checked for stretch with what?
With a contour or radius gauge
Hot spark plugs ar generally used in aircraft power plants?
With comparatively low operating temperatures
On an aircraft that utilizes an exhaust heat exchanger as a source of cabin heat, how should the exhaust system be inspected?
With the heater shroud removed
The indication on a thermocouple-type cylinder head temperature indicator is produced by?
a current generated by the temperature difference between dissimilar metal hot and cold junctions.
During ground check an engine is found to be rough-running, the magneto drop is normal, and the manifold pressure is higher than normal for any given RPM. The trouble may be caused by
a dead cylinder.
Carburetor icing on an engine equipped with a constant speed propeller can be detected by?
a decrease in manifold pressure with a constant RPM.
The valve clearance of an engine using hydraulic lifters, when the lifters are completely flat or empty should not exceed?
a specified amount above zero.
The fuel metering force of a conventional float type carburetor in its normal operating range is the difference between the pressure acting on the discharge nozzle located within the Venturi and the pressure?
acting on the fuel in the float chamber.
A constant speed propeller provides maximum efficiency by?
adjusting blade angle for most conditions encountered in flight.
Cold straightening a bent aluminum propeller blade may be accomplished by?
an appropriately rated repair station or the manufacturer.
When checking the idle mixture on a carburetor, the engine should be idling normally, then pull the mixture control toward the IDLE CUTOFF position, a correct idling mixture will be indicated by?
an increase of 10 to 50 RPM before decreasing.
In an aircraft equipped with a pressure drop type fuel flow indicating system. If one of the injector nozzles becomes restricted, this would cause a decrease in fuel flow with?
an increased fuel flow indication on the gauge.
Thermocouple leads
are designed for a specific installation and may not be altered.
After a fire is extinguished, or overheat condition removed in aircraft equipped with a systron-donner fire detector, the detection system?
automatically resets.
During the inspection of an engine control system in which push pull control rods are used, the threaded rod ends should?
be checked for the amount of thread engagement by means of the inspection holes.
Direct mechanical push-pull carburetor heat control linkages should normally be adjusted so that the stop located on the diverter valve will be contacted
before the stop at the control lever is reached in both HOT and COLD positions.
Where physical separation of the fuel lines from electrical wiring or conduit is impracticable, locate the fuel line?
below the wiring and clamp the line securely to the airframe structure.
An indication of unregulated power changes that result in continual drift of manifold pressure indication on a turbosupercharged aircraft engine is known as
bootstrapping
Possible failure related ferrous metal particles in turbine engine oil cause an electrical indicating type magnetic chip detector to indicate their presence by?
bridging the gap between the detector center (positive) electrode and the ground electrode.
An engine misses in both the right and left positions of the magneto switch. The quickest method for locating the trouble is to
check for one or more cold cylinders.
On small aircraft engines, fuel vaporization may be increased by?
circulating the fuel and air mixture through passages in the oil sump.
An indication that the optimum idle mixture has been obtained occurs when the mixture control is moved to IDLE CUTOFF and manifold pressure?
decreases and RPM increases momentarily before the engine ceases to fire.
The purpose of staggered ignition is to compensate for?
diluted fuel/air mixture around exhaust valve.
Engine pressure ratio is determined by?
dividing turbine outlet total pressure by engine inlet total pressure.
Magneto breaker point opening relative to the position of the rotating magnet and the distributor rotor (internal timing) can be set most accurately?
during assembly of the magneto before installation on the engine.
Engine crankshaft runout is usually checked?
during engine overhaul and after a "prop strike" or sudden engine stoppage
A common type of electrically operated oil temperature gauge utilizes?
either a wheatstone bridge of ratiometer circuit.
Turbojet and turbofan thrust reverser systems are generally powered by?
electricity, hydraulic pressure, and pneumatic pressure.
Anti-icing of jet engine air inlets is commonly accomplished by?
engine bleed air ducted through the critical areas.
If the oil pressure of a cold engine is higher than at normal operating temperatures, the
engine's lubrication system is probably operating normally.
The active clearance control (ACC) portion of an EEC system aids turbine engine efficiency by?
ensuring turbine blade to engine case clearances are kept to a minimum by controlling case temperatures.
Reduced air density at high altitude has a decided effect on carburetion, resulting in a reduction of engine power by
excessively enriching the fuel/air mixture.
A hissing sound from the exhaust stacks when the propeller is being pulled through manually indicates
exhaust valve blow-by.
An aircraft should be facing into the wind when trimming an engine. However, if the velocity of the wind blowing into the intake is excessive, it is likely to cause a
false high compression and turbine discharge pressure, and a subsequent low trim.
The primary reason for careful inspection and prompt repairing of minor surface defects such as scratches, nicks, gouges, etc. on aluminum alloy propellers is to prevent?
fatigue failure
Aircraft that operate more than one generator connected to a common electrical system must be provided with?
individual generator switches that can be operated from the cockpit during flight.
Idle cutoff is accomplished on a carburetor equipped with a back suction mixture control by?
introducing low pressure (intake manifold) air into the float chamber.
When using an electric starter motor, current usage?
is highest at the start of motor rotation.
When using an electric starter motor, the current flow through it?
is highest at the start of motor rotation.
Frequently, an aircrafts auxiliary power unit (APU) generator?
is identical to the engine-driven generators.
Propeller fluid anti-icing systems generally use which of the following?
isopropyl alcohol
One of the advantages of inspecting an aluminum propeller utilizing dye-penetrant inspection procedure is that?
it shows whether visible lines and other marks are actually cracks rather than scratches.
Excessive valve clearance results in the valves opening
late and closing early.
If an engine operates with a low oil pressure and a high oil temperature, the problem may be caused by a
leaking oil dilution valve.
An unsupercharged aircraft reciprocating engine, operated at full throttle from sea level to 10,000 feet provided the RPM is unchanged will?
lose power due to the reduced density of the air drawn into the cylinders.
If the oil pressure gauge fluctuates over a wide range from zero to normal operating pressure, the most likely cause is
low oil supply
During routine inspection of a reciprocating engine, a deposit of small,bright, metallic particles which do not cling to the magnetic drain plug is discovered in the oil sump and on the surface of the oil filter. This condition?
may be a result of abnormal plain type bearing wear and is cause for further investigation.
A broken cooling fin on a cylinder head?
may be filed to smooth contours if damage and/or repair limits are not exceeded.
If, during inspection at engine overhaul, ball or roller bearings are found to have magnetism but otherwise have no defects they?
must be degaussed before use.
Bonding jumpers should be designed and installed in such a manner that they?
provide a low electrical resistance in the ground circuit.
Boost pumps in a fuel system?
provide a positive flow of fuel to the engine pump.
Valve clearance changes on opposed-type engines using hydraulic lifters are accomplished by
push rod replacement.
The differential pressure controller in a turbocharger system?
reduces bootstrapping during part-throttle operation.
When in operation, the speed of an APU?
remains at or near rated speed regardless of the load condition.
In order to maintain a constant oil pressure as the clearances between the moving parts of an engine increase through normal wear, the supply pump output?
remains relatively constant (at a given RPM) with less oil being returned to the pump inlet by the relief valve.
Engine operating flexibility is the ability of the engine to
run smoothly and give the desired performance at all speeds.
In addition to causing accelerated wear, dust or sand ingested by a reciprocating engine may also cause?
silicon fouling of spark plugs.
ON-OFF two position engine electrical switches should be installed?
so the ON position is reached by a forward or upward motion.
Great caution should be exercised in handling damaged hermetically sealed turbine engine igniter transformer units because?
some contain radioactive material.
Before attempting to start a radial engine that has been shut down for more than 30 minutes,
turn the propeller by hand three to four revolutions in the normal direction of rotation to check for liquid lock.
Motor driven impeller and turbine fuel flow transmitters are designed to transmit data?
using aircraft electrical system power.
During overhaul, the disassembled parts of an engine are usually degreased with some form of mineral spirits solvent rather than water mixed degreasers primarily because?
water-mixed degreaser residues may cause engine oil contamination in the overhauled engine.
Turbine engine components exposed to high temperatures generally may not be marked with?
wax or grease pencil, and graphite lead pencil.
According to the FAR's oil tank fillers on turbine engines must be marked?
"Oil"
Oil tank fillers on reciprocating engines are marked with the word?
"Oil" in accordance with far 23
The velocity of subsonic air as it flows through a convergent nozzle?
Increases
The velocity of supersonic air as it flows through a divergent nozzle?
Increases
A nine-cylinder engine with a bore of 5.5 inches and a stroke of 6 inches will have a total piston displacement of?
1,283 inches
Which of the following statements most accurately describes spark plug heat range?
A cold plug is designed so that the insulator tip is reasonably short to hasten the rate of heat transfer from the tip through the spark plug shell to the cylinder head.
What device is used to convert alternating current, which has been induced into the loops of the rotating armature of a dc generator into direct current?
A commutator
What is meant by a double entry centrifugal copmpressor
A compressor with vanes on both sides of the impeller
What is the profile of a turbine engine compressor blade?
A cutout that reduces blade thickness
What protects the starter when starting?
A de-rated starter switch
When selecting an electrical switch for installation in an aircraft circuit utilizing a direct current motor?
A debating factor should be applied
The use of the carburetor air heater when it is not needed causes?
A decrease in power and possibly detonation
What is the function of a blast tube as found on aircraft engines?
A device to cool engine accessories
If the ignition switch is moved from BOTH to either LEFT or RIGHT during an engine ground check, normal operation is usually indicated by a
A drop in torque meter pressure indication
What will be the effect if the spark plugs are gapped too wide?
Hard starting
Vortex dissipation systems are generally activated by?
A landing gear switch
What normally prevents a hartzell compact propeller from going to feather when the engine is shut down on the ground?
A latch mechanism composed of springs and lock pins.
If a float type carburetor becomes flooded, the condition is most likely caused by?
A leaking needle valve and seat assembly
A weak fuel to air mixture along with normal airflow through a turbine engine may result in?
A lean die-out
The explosive cartridge in the discharge valve of a fire extinguisher container is?
A life dated unit
What is the difference between a low tension and high tension engine ignition system?
A low-tension system uses a transformer coil near the spark plugs to boost voltage, while the high-tension system voltage is constant from the magneto to the spark plugs.
Which fuel/air mixture will result in the highest engine temperature (all other factors remaining constant)?
A mixture leaner than a manual lean mixture of .060.
By use of a differential pressure compression tester, it is determined that the No. 3 cylinder of a nine-cylinder radial engine will not hold pressure after the crankshaft has been rotated 260° from top dead center compression stroke No. 1 cylinder. How can this indication usually be interpreted?
A normal indication
A condition known as "hot streaking" in turbine engines is caused by?
A partially clogged fuel nozzle
The thermocouple leads used to measure cylinder temperature on an aircraft reciprocating engine?
Are connected to the electrical wiring on one engine and the cylinder on the other end
When must an airworthiness directive be complied with after it becomes effective?
As specified in the AD
What type of oil fo most engine manufacturers reccomend after a new reciprocating engine has been broken in?
Ashless dispersant oil
What is the result of flashover in a distributer?
Conductive carbon trail
A turbine engine dry sump lubrications system of the self contained, high pressure design?
Consist of pressure, breather, and scavenge systems
The generating system of an aircraft charges the battery by using?
Constant voltage and varying current
How does carbon dioxide or CO2 extinguish an aircraft engine fire?
Contact with the air converts the liquid into snow and gas which smothers the flame
A major difference between the teledyne-continental and RSA (precision air motive or bending) continuous flow fuel injection systems in fuel metering is that the?
Continental system uses fuel pressure only as a metering force
When does current flow through the coil of a solenoid operated electrical switch?
Continually, as long as the control circuit is complete.
If a fire starts in the induction system during the engine starting procedure what should the operator do?
Continue cranking the engine
What is one purpose of the stator blades in the compressor section of a turbine engine?
Control the direction of airflow
The floating control thermostat, used on some recipricating engine installations, helps regulate the temperature by?
Controlling air flow through the oil cooler
How do cowl flaps aid in cooling a horizontally opposed aircraft engine?
Controls the amount fo air flowing around the cylinder
What is the purpose of the rate of change controller in a turbocharger system?
Controls the rate at which the turbocharger discharge pressure will increase
The rotor blades of the axial flow compressor are usually made of what type of material?
Stainless steel
A severe condition of chafing or fretting in which a transfer of metal from one part to another occurs is called?
Galling
What basic meter is used to indicate cylinder head temperature in most aircraft?
Galvanometer
As a aid to cold weather starting, the oil dilution system thins the oil with?.
Gasoline
What is used to drive a supercharger?
Gear train to the crankshaft
In regard to using a turbine engine oil analysis program, which of the following is NOT true?
Generally, an accurate trend forecast may be made after an engine's first oil sample analysis.
If a generator is malfunctioning, its voltage can be reduced to residual by actuating the?
Generator master switch
If the points in a vibrator type voltage regulator stick in the closed position while the generator is operating, what will be the probably result?
Generator output voltage will increase
What actuated the pilot valve in the governor of a constant speed propeller?
Governor flyweights
What is an approved marking compound doe exhaust systems?
Graphite free grease pencil
The operating temperature Valve clearance of radial engine as compared to cold valve clearance is?
Greater
Apparent engine roughness is often a result of propeller unbalance. The effect of an unbalanced propeller will usually be?
Greater at high RPM
What is the primary advantage of an axial flow compressor over a centrifugal compressor?
Greater pressure ratio
The centrifugal twisting force acting on a propeller blade is?
Greater than the aerodynamic twisting force and tends to move the blade to a lower angle
Magneto breaker points must be times to open when the?
Greatest magnetic field stress exists in the magnetic circuit
What likely effect would a cracked distributor rotor have on a magneto
Ground the secondary circuit through the crack
In order to turn a magneto off, the primary circuit must be?
Grounded
Severe rubbing of turbine engine compressor blades will usually cause?
Gualling
On aircraft equipped with hydraulically operated constant speed propellers, all ignition and magneto checking is done with the propeller in which position?
HIGH RPM
Which of the following fire extinguishing agents is best for preventing reflash?
Halon 1211
Which of the following is the safest fire extinguishing agent to use from the standpoint of toxicity and corrosion hazards?
Halon 1301
Propeller blade station numbers increase from?
Hub center line to tip
Reciprocating engine power will be decreased at all altitudes if the?
Humidity is increased
In a typical starter generator system, under which of the following circumstances may it be necessary to use the start stop switch?
Hung start
Thrust reversers are most commonly actuated by?
Hydraulic and pneumatic pressure
A condition that can occur in radial engines but is unlikely to occur in horizontally opposed engines is?
Hydraulic lock
Turbojet and turbofan thrust reverser systems are generally powered by?
Hydraulic or pneumatic pressure
Which type of fuel control is used on most of todays turbine engines?
Hydromechanical or electronic
The theoretical horsepower a recipricating engine develops is?
IHP indicated horsepower
An increase in manifold pressure when carburetor heat is applied indicated?
Ice was forming in the carburetor
Concerning the propeller electronic deicer boots; pick the correct statement?
Icing control is accomplished by converting electrical energy to heat energy in the heating element. Balanced ice removal from all blades must be obtained as nearly as possible if excessive vibration is to be avoided
An engine becomes overheated due to excessive taxiing or improper ground run up. Prior to shut down, operation must continue until cylinders have cooled, by running engine at?
Idle RPM
Which of the following would be a factor in the failure of an engine to develop full power at takeoff?
Improper adjustment of carburetor heat valve control linkage
Which of the following could cause damage to the nose ceramic or to the electrode on an aircraft spark plug?
Improper gapping procedure
Which of the following will decrease volumetric efficiency in a reciprocating engine?
Improper valve timing. Sharp bends in the induction system. High carburetor air temperatures.
Three types of turbine blades are?
Impulse, reaction, and impulse reaction
What type of turbine blade is most commonly used in aircraft jet engines?
Impulse-reaction
Beta control range (beta mode) is the range of operations of a turboprop powerplant used for?
In flight approach and ground handling of engine aircraft
What is the electrical location of the primary capacitor in a high tension magneto?
In parallel with the breaker points
Which of the following statements regarding magneto switch circuits is not true?
In the BOTH position, the right and left magneto circuits are grounded.
Where are the high and low pitch stops of a Hamilton standard constant speed or two position counterweight propeller located?
In the counterweight assembly
Where are sludge chambers, when used in aircraft engine lubrication systems usually located?
In the crankshaft throws
Where is the highest gas pressure in a turbojet engine?
In the entrance of the burner section
As an aircraft engines speed is increased, the voltage induced in the primary coil of the magneto?
Increases
The basic oil pressure relief valve setting for a newly overhauled engine is made?
In the overhaul shop
Excessively rich of lean idle mixtures result in?
Incomplete combustion
Under which of the following conditions would an engine run lean even though there is a normal amount of fuel present?
Incomplete fuel vaporization
Ignition check during engine run up indicates a slow drop in RPM. This is usually caused by?
Incorrect ignition timing or valve adjustment
If the volume of air passing through a carburetor venturi is reduced, the pressure at the venturi throat will
Increase
An exhaust cone placed aft of the turbine in a jet engine will cause the pressure in the first part of the exhaust duct to?
Increase and the velocity to decrease
In order to stabilize cams, springs, linkages, within the fuel control manufacturers generally recommend that all final turbine engine trim adjustments be made in the?
Increase direction
Which of the following is a function of the fuel oil heat exchanger on a turbojet engine?
Increase fuel temperature
The primary purpose of a cuff on a propeller is to?
Increase the flow of cooling air to the engine nacelle
The aerodynamic force acting on a rotating propeller blade operating at a normal pitch angle tends to?
Increase the pitch angle
The action of a carburetor air-scoop is to supply air to the carburetor, but it may also?
Increase the pressure of the incoming air by ram effect
The stators in the turbine section of a gas turbine engine?
Increase the velocity of gas flow
Turbine nozzle diaphragms located on the upstream side of each turbine wheel are used in the gas turbine engine to?
Increase the velocity of the heated gases flowing past this point
A powerplant using a hydraulically controlled constant speed propeller is operating within the propeller's constant speed range at a fixed throttle setting. If the tension of the propeller governor control spring (speeder spring) is reduced by movement of the cockpit propeller control, the propeller blade angle will ?
Increases engine manifold pressure will increase, and engine RPM will decrease
The economizer system in a float type carburetor?
Increases the fuel/air ratio at high power settings
Counterweights on constant speed propellers are generally used to aid in?
Increasing blade angle
Advantages of dual ignition in aircraft engines include providing a backup magneto system, increasing the output power of the engine, and?
Increasing the output power of the engine
Which of the following functions requires the use of a propeller protractor?
Indexing blade
A manifold pressure gauge is designed to?
Indicate absolute pressure in the intake manifold
The horsepower developed in the cylinder of a reciprocating engine is known as the?
Indicated horsepower
In a high tension magneto ignition system, the current in the magneto secondary winding is?
Induced when the primary circuit is interrupted
The fuel pump relief valve directs excess fuel to the?
Inlet side of the fuel pump
Which of the following statements concerning the installation of a new fixed pitch wood propeller is true?
Inspect the bolts for tightness after the first flight and again after the first 25 hours of flying.
When replacing a complete ignition wiring harness, the distributer blocks are not numbered for all high tension leads, in these cases?
Install the first cylinder to fire no.1 location on the block,. The second in the firing order to no.2 location, etc
What would be the probable result if the oil system pressure relief valve should stick in the open position on a turbine engine?
Insufficient lubrication.
A typical barrier type aircraft terminal strip is made of?
Paper based phenolic compound
A magneto ignition switch it connected?
Parallel to the breaker points
Generally, unless otherwise specified by the manufacturer, repairs of nicks, scratches, gouges, etc. on aluminum propeller blades must be made?
Parallel to the length of the blade
Which of the following results in a Decrease in volumetric efficiency?
Part throttle operation
What is the result of an exhaust muffler internal failure in a small reciprocating engine?
Partial or total blockage of flow of exhaust gases resulting in engine failure
To determine the float level in a float type carburetor, a measurement is usually made from the top of the fuel in the float chamber to the?
Parting surface of the carburetor
During propeller installation, the bolts should be torqued in what sequence?
Per the manufacturers specifications
In what units are turbine engine tachometers calibrated?
Percent of engine RPM
Why is Unnecessary to flash the field of the exciter on a brushless alternator?
Permanent magnets are installed in the main field poles
What could cause excessive pressure buildup in the crankcase of a recip engine?
Plugged crankcase breather
Manually feathering a hydromechanical propeller means to?
Port governer oil pressure from the cylinder of the propeller
The primary purpose of the front and rear cones for propellers that are installed on splined shafts is to?
Position the propeller hub on the splined shaft
When an engine with subsonic divergent type inlet duct is running in place at high speed on the ground, the air pressure within the inlet is?
Positive
The type of oil pump most commonly used on turbine engines are classified as?
Positive displacement
A rotary valve pump is best described as a?
Positive displacement pump
Ice formation on a propeller blade will?
Produce unbalanced vibration
Which of the following contains a table that lists the engines to which a given propeller is adaptable?
Propeller Type Certificate Data Sheets.
On most reciprocating multi engine aircraft, the automatic propeller synchronization is accomplished through the actuation of the?
Propeller governers
Which of the following determines oil and grease specifications for lubrication of propellers
Propeller manufacturers instructions
The purpose of a safety gap in a Magneto is to?
Protect the high voltage winding from damage
What kind of air entrance is generally used on axial flow engines?
Single entrance
The two types of centrifugal compressor impellers are?
Single entry and double entry
The fuel level within the float chamber of a properly adjusted float type carburetor will be?
Slightly lower than the discharge nozzle outlet
Which of the following is not used to detect fires in reciprocating engine nacelles?
Smoke detectors
When cleaning aluminum and magnesium engine parts, it is in advisable to soak them in solutions containing soap because?
Some of the soap will become impregnated in the surface of the material and subsequently cause engine oil contamination and foaming
One of the best indicators of reciprocating engine combustion chamber problems is?
Spark plug condition
If staggered ignition timing is used, the?
Spark plug nearest the exhaust valve will fire first
A term commonly used when two or more electrical terminals are installed on a single lug of a terminal strip is?
Stacking
Which of the following variables affect the inlet air density of a turbine engine?
Speed of the aircraft, altitude of the aircraft, ambient temperature
Oil leakage around the rear cone of a hydromatic propeller usually indicated a defective?
Spider shaft oil seal
Cylinder walls are usually lubricated by?
Splashed or sprayed oil
Which turbine engine compressor offers the greatest advantage for both starting flexibility and improved high altitude performance?
Split spool, axial flow
Detonation is best defined as?
Spontaneous explosion of the fuel/air mixture
How is the fire extinguishing agent distributed in the engine section?
Spray nozzles and perforated tubing
Reciprocating engines exhaust system designs commonly used to provide for ease of installation and/or allow for expansion and contraction, may include the use of?
Spring loaded ball/flexible joints, slip joints, bellows
The functions of an APU air inlet plenum is to?
Stabilize the pressure of the air before it enters the compressor
What are the two basic elements of the turbine section in a Turbine engine?
Stator and rotor
A safety feature usually employed in pneumatic starters that is used to prevent the starter from reaching burst speed if inlet air does not terminate on schedule is the?
Stator nozzle design that chokes airflow and stabilizes turbine wheel speed
Airflow to the pneumatic starter from a ground unit is normally prevented from causing starter over speed during engine start by?
Stator nozzle design that chokes airflow and stabilizes turbine wheel speed
The non-rotating axial flow compressor airfoils in an aircraft gas turbine engine are called?
Stator vanes
Between each row of rotating blades in a turbine engine compressor, there is a row of stationary blades which act to diffuse the air. These stationary blades are called?
Stators
Which of the following acts as a diffuser in a turbine engine and converts velocity to pressure?
Stators
A pilot reports that the fuel pressure fluctuates and exceeds the upper limits whenever the throttle is advanced. The most likely cause of the trouble is?
Sticking fuel pump relief valve
What type of oil do most engine manufacturers recommend for new reciprocating engine break in?
Straight mineral oil
The function of the exhaust cone assembly of a turbine engine is to?
Straighten and collect the exhaust gases into a solid exhaust jet
In an axial flow compressor, one purpose of the stator vanes at the discharge end of the compressor is to?
Straighten the airflow and eliminate turbulance
The most effective method of regulating aircraft direct current generator output is to vary, according to the load requirements, the?
Strength of the stationary field
When aircraft turbine blades are subjected to excessive heat stress, what type of failures would you expect?
Stress rupture
Which of the following fire detection systems will detect a fire when an element is inoperative but will not test when the test circuit is energized?
The Kidde system and the Fenwal system.
A spark plugs heat range is the result of?
The ability to transfer heat from the firing end of the spark plug to the cylinder head
Where would one find the type design information for an R1830-92 engine certificate Dundee the civil air regulations and installed on a DC-3?
The aircraft engine specifications
Into what part of a reciprocating engine induction system is deicing alcohol normally injected?
The airstream ahead of the carburetor.
What will occur if the vapor vent float in a pressure carburetor loses its buoyancy?
The amount of fuel returning to the fuel tank from the carburetor will be increased.
Usually most of the load placed on an APU occurs when?
The bleed air valve is opened
In a high tension ignition system, a primary capacitor of too low capacity will cause?
The breaker contacts to burn
What is the relationship between distributer and crankshaft speed of an aircraft reciprocating engine?
The distributer runs at one half crankshaft speed
Thrust reversers utilizing a pneumatic actuating system usually recieve operating pressure from ?
The engine bleed air system
The numbers appearing on the ignition distributer block indicate?
The firing order of the distributer
What occurs when a back suction type mixture control is placed in IDLE CUTOFF
The float chamber will be vented to a negative pressure area.
Which of the following occurs to cause front cone bottoming during propeller installation?
The front cone contacts the ends of the shaft splines, preventing the front and rear cones from being tightened against the cone seats in the propeller hub.
Newtons law of motion generally termed "law of momentum" states; acceleration is produced when force acts upon a mass.
The greater the mass the greater amount of force needed
Why are turbine engine igniters less susceptible to fouling than reciprocating engine spark plugs?
The high intensity spark cleans the igniter
Most exhaust system failures result from thermal fatigue cracking in the areas of stress concentration. This condition is usually caused by?
The higher temperature at which exhaust systems operate
Where are the hot and cold junctions located in an engine cylinder temperature indicating system?
The hot junction is located at the cylinder and the cold junction is located at the instrument.
Which statement is correct regarding a dour stroke cycle aircraft engine?
The intake valve closes on the compression stroke
When a 28 volt, 75 ampere generator is installed on a aircraft an electrical load analysis ground check is preformed and it is determined that the battery is furnishing 57 amperes to the system, with all electrical equiptment operating. This indicates?
The load will be within the generator load limit
Select the correct statement concerning the idle system of a conventional float type carburetor?
The low pressure between the edges of the throttle valve and the throttle body pulls the fuel from the idle passage.
What is the final authority for the details of carburetor overhaul?
The manufacturers reccomendations
What controls the constant speed range of a constant speed propeller?
The mechanical limits in the propeller pitch range
Which statement pertaining to fuel/air ratios is true?
The mixture ratio which gives the best power is richer than the mixture ratio which gives maximum economy
The application of carburetor heat ill have which of the following effects?
The mixture will become richer
Why does the smoothness of operation of an engine increase with a greater number of cylinders?
The power impulses are spaced closer together
The primary conditions that allow microorganisms to grow in the fuel in aircraft fuel tanks is (are)?
The presence of water
What is the primary purpose of changing aircraft engine lubricating oils at predetermined periods?
The oil becomes contaminated with moisture, acids, and finely divided suspended solid particles.
What will be the result of operating an engine in extremely high temperatures using a lubricant recommended by the manufacturer for a much lower temperature?
The oil pressure will be lower than normal
A clicking sound heard at engine coast down in a pneumatic starter incorporating a spray clutch ratchet assembly is an indication of?
The pawls re-contacting and riding on the ratchet gear
As the pressure is applied during a reciprocating engine compression check using a differential pressure tester, what would a movement of the propeller in the direction of engine rotation indicate?
The piston was positioned past top dead center.
The pitch changing mechanism of the hydromatic propeller is lubricated by?
The pitch changing oil
Generally when maximum APU shaft output power is being used in conjunction with pneumatic power?
The pneumatic loading will be automatically modulated to maintain a safe EGT.
What would be the result if a magneto breaker point mainspring did not have sufficient tension?
The points will float or bounce
Which statement is true regarding bearings used in high powered reciprocating aircraft engines?
There is less rolling friction when ball bearings are used than when roller bearings are employed
A fire detection system that operates on the rate of temperature rise is a?
Thermocouple
Cylinder head temperatures are measured by means of an indicator and a?
Thermocouple sensing device
Which of the following fire detection in systems measures temperature rise compared to a reference temperature?
Thermocouples
Spark plug fouling caused by lead deposits occurs most often?
When cylinder head temperatures are relitively low
How does the propeller over speed governor on a turboprop engine decrease propeller RPM?
When oil pressure is decreased, the return spring and counterweights force the oil out of the servo piston
During what period does the fuel pump bypass valve open and remain open?
When the boost pump pressure is greater than fuel pump pressure.
When does battery current flow through the primary circuit of a battery ignition coil?
When the breaker points are closed and the ignition switch is on
Under which of the following conditions is the oil cooler flow control valve open on a reciprocating engine?
When the temperature of the oil returning from the engine is too low
Which statement best describes the blow out type indicator disk on a fixed fire extinguishing system?
When the yellow indicator disk is missing, it indicated the fire extinguishing system has been normally discharged
The e gap angle is usually defined as the number of degrees between the neutral position of the rotating magnet and the position?
Where the contact points open
The use of water on a class D fire ?
Will cause the fire to burn more violently and can cause explosions
Standard aircraft cylinder oversizes usually range from 0.010 inch to 0.030 inch. Oversize on automobile engine cylinders may range up to 0.100 inch. This is because aircraft engine cylinders
have relatively thin walls and may be nitrided.
Lubricating oils with high viscosity index ratings are oils?
in which the viscosity does not vary much temp change.
An increase in manifold pressure with a constant RPM will cause the bearing load in an engine to
increase
If metallic particles are found in the oil filter during an inspection,
the cause should be identified and corrected before the aircraft is released for flight.
When internally timing a magneto, the breaker points begin to open when?
the magnet poles are a few degrees beyond the neutral position.
A red triangle, dot, or diamond mark on an engine instrument face or glass indicates?
the maximum limit for high transients such as starting.
The vent line connecting the oil supply tank and the engine in some dry sump engine installations permits?
the oil tank to be vented through the normal engine vent.
Propeller blade tracking is process of determining?
the positions of the tips of the propeller blades relative to each other.
When the ignition switch of a single (reciprocating) engine aircraft is turned to the OFF position,
the primary circuits of both magnetos are grounded.
Capacitance after firing of a spark plug is caused by?
the stored energy in the ignition shielded lead unloading after normal timed ignition.
