AT 363 Final Exam Fall 2017 (Exams 1-3 Questions)
Match the type of propeller force with its description Centrifugal Force Torque Bending Force Thrust Bending Force Aerodynamic Twisting Force Centrifugal Twisting Force a. The force that tends to force the blades toward low blade angle b. The force that tends to bend the propeller blades in the direction opposite that of rotation c. The force that tends to throw the rotating propeller blades away from the hub d. The force that tends to turn the blades to a high blade angle e. The load that tends to bend propeller blades forward as the aircraft is pulled through the air
C - Centrifugal Force B - Torque Bending Force E - Thrust Bending Force D - Aerodynamic Twisting Force A - Centrifugal Twisting Force carburetors break everyday, designed attrociously
When the primary circuit current flow is stopped, the magnetic field surrounding the primary windings ___________________
COLLAPSES
Match the chamber with the fuel or air pressure it contains. Chamber A Chamber B Chamber C Chamber D Chamber E A. fuel pump pressure B. unmetered fuel pressure C. manifold air pressure D. air-inlet pressure E. venturi air pressure F. nozzle fuel pressure G. metered fuel pressure
DEGBA like degobah from starwards A - air inlet pressure B - venturi air pressure C - metered fuel pressure D - unmetered fuel pressure E - fuel pump pressure
T/F: Capacitance is the ability to produce an electrostatic charge between two conducing plates connected by a dielectric.
FALSE
T/F: The carbon trail results from the electric spark burning dirt particles that contain moisture.
FALSE
Since most high-tension magnetos have many thousands of turns of wire in the secondary coil windings, a very HIGH/LOW voltage is generated.
HIGH
The __________ ___________ _________ system is still the most widely used aircraft ignition system.
HIGH TENSION MAGNETO
Which of the following are distinct circuits of a high tension magneto? 1. Magnetic 2. Primary 3. E gap 4. P lead 5. Secondary
Magnetic, primary, secondary 1, 2, 5
Magneto operation is timed to the ___________ so that a spark occurs only when the piston is on the ________________ at a specified number of [crankshaft] __________ before the top dead center ___________ position. Fill in the blanks: -engine -proper stroke -crankshaft degrees -piston
Magneto operation is timed to the [engine] so that a spark occurs only when the piston is on the [proper] [stroke] at a specified number of [crankshaft] [degrees] before the top dead center [piston] position.
T/F: Good magneto air circulation and ventilation also ensures that corrosive gases produced by normal arching across the distributor air gap, such as ozone, are carried away.
TRUE
T/F: A "Shower of Sparks" system utilizes a battery to provide electricity to the ignition system.
TRUE
T/F: Flange-mounted magnetos are attached to the engine by a flange around the driven end of the rotating shaft of the magneto.
TRUE
T/F: In a pressurized magneto, the air is allowed to flow through and out of the magneto housing
TRUE
The magneto generates electrical power by the engine rotating the ______________ ______________ and inducing a _____________ to flow in the coil windings. Place the terms correctly. Not all are used. permanent magnet coil windings current voltage
The magneto generates electrical power by the engine rotating the PERMANENT MAGNET and inducing a CURRENT to flow in the coil windings.
Is there a problem if an aircraft ignition switch is turned off and the engine continues to run normally? a) Yes, the p-lead is grounded. b) Yes, the OFF position of the ignition switch is grounded. c) No, this is acceptable if the RPM is in the green arc.
a) Yes, the p-lead is grounded.
In a direct drive engine, you can get how much of a change in RPM by changing the blade angle 2 degrees? a. 120-180 b. 60-90 c. 100-110
a. 120-180
What would likely cause a reciprocating engine equipped with a float carburetor to hesitate momentarily when the throttle is rapidly advanced from idle to full power? a. A malfunctioning accelerator pump. b. The automatic mixture control is malfunctioning. c. A mis-adjusted mixture cable.
a. A malfunctioning accelerator pump.
Which method is commonly used to adjust the level of a float in a float type carburetor? a. Add or remove shims under the needle valve seat b. Lengthening or shortening the float shaft c. Change the angle of the float arm pivot
a. Add or remove shims under the needle valve seat
What does a fuel-injected engine have that prevents the loss of induction air, if the air inlet filter should become covered with ice? a. An alternate air valve allows warm air from inside the engine cowling to flow into the fuel metering system. b. Air filters have heating elements to eliminate icing. c. No alternative is needed because there is no air filter in a fuel injection system
a. An alternate air valve allows warm air from inside the engine cowling to flow into the fuel metering system.
* How does the propeller overspeed governor on a turboprop engine decrease propeller RPM? a. By allowing oil to escape from the propeller hub thus driving the blades to an increased blade angle. b. By increasing oil pressure in the propeller thus driving the blades to an increased blade angle. c. By reducing fuel flow to the fuel control thus driving the blades to an increased blade angle.
a. By allowing oil to escape from the propeller hub thus driving the blades to an increased blade angle.
* How is the speed of a constant-speed propeller changed in flight? a. By changing the load tension against the flyweights in the governor. b. By varying the output of the governor booster pump. c. By advancing or retarding the throttle.
a. By changing the load tension against the flyweights in the governor.
* Which of the following forces or combination of forces operates to move the blades of a constant-speed counterweight-type propeller to the HIGH PITCH position? a. Centrifugal force acting on the counterweights. b. Engine oil pressure acting on the propeller piston-cylinder arrangement and centrifugal force acting on the counterweights. c. Prop governor oil pressure acting on the propeller piston-cylinder arrangments.
a. Centrifugal force acting on the counterweights.
In the Bendix RSA fuel injection system, which chamber in the regulator unit will have the lowest air pressure? a. Chamber A: venturi air section b. Chamber B: inlet air pressure c. Chamber C: metered fuel pressure
a. Chamber A: venturi air section
What is the purpose of the p-lead while the magneto is off? a. Disable the output of the magneto by connecting the primary coil to ground b. Disable the output of the magneto by connecting the secondary coil to ground c. Disable the output of the magneto by connecting the breaker points to ground
a. Disable the output of the magneto by connecting the primary coil to ground
A trailing finger electrode in a booster coil allows a. For retardation of the spark during start b. For advancement of the spark during normal operation c. Provides an additional path to ground when mag should not be firing
a. For retardation of the spark during operation
The best time for carburetor ice to form is a. High temp, high humidity days b. High temp, low humidity days c. Late in the afternoon
a. High temp, high humidity days
How is the magneto ignition switch connected to the breaker points? a. In parallel b. In series c. In series-parallel
a. In parallel
Which of the following statements regarding magneto switch circuits is NOT true? a. In the BOTH position the right and left magneto circuits are grounded b. In the OFF position neither the right nor left magneto circuits are open c. In the RIGHT position, the right magneto circuit is open and the left magneto circuit is grounded
a. In the BOTH position the right and left magneto circuits are grounded they are open, not grounded
If you are operating an airplane with a constant speed propeller and increase the propeller control lever what effect are you having on propeller load? a. Increase b. Decrease c. No change
a. Increase
From the Magneto Inductor Vibrator Circuit video, which of the following is NOT component of the system? a. induction magnet b. inductor vibrator c. ignition switch
a. Induction Magnet
An aircraft's propeller system beta range a. Is used to produce zero or negative thrust b. Is used to achieve maximum thrust during takeoff c. Refers to the most fuel efficient pitch range to use at a given RPM
a. Is used to produce zero or negative thrust
* Which of the following best describes the blade movement of a propeller that is in the high RPM position when reversing action is begun? a. Low pitch directly to reverse pitch. b. Low pitch through feather position to reverse pitch. c. Low pitch through high pitch to reverse pitch.
a. Low pitch directly to reverse pitch.
If the fuel strainer is plugged, what problem can be the result? a. Low takeoff fuel flow b. High fuel flow indicator reading c. Poor cutoff
a. Low takeoff fuel flow
An engine misses in both the right and left positions of the magneto switch. The quickest method for locating the trouble is to a. Perform a compression check b. Check each spark plug c. Check for one or more cold cylinders
a. Perform a compression check
The Bendix RSA system is also known as a. Precision Airmotive b. Marvel-Schebler c. Bendix Float Systems
a. Precision Airmotive
What is the purpose of the metal tipping that is fastened to the leading edge of wooden propellers? a. Protect wood from damage and erosion b. Improves aerodynamic performance c. Decorative
a. Protect wood from damage and erosion
What kind of voltage does the starting vibrator produce? a. Pulsating DC b. Pulsating AC c. Direct DC d. Direct AC
a. Pulsating DC
What is the purpose of using an impulse coupling with a magneto? a. To produce a momentary high rotational speed of the magneto. b. To absorb impulse vibrations between the magneto and the engine. c. To compensate for backlash in the magneto and the engine gear.
a. To produce a momentary high rotational speed of the magneto.
What is the correct method for measuring spring height in a magneto? a. Top of spring to top of tower b. Bottom of tower to top of spring c. Bottom of tower to top of tower
a. Top of spring to top of tower
A deice system is used to remove ice already formed on the propeller blade a. True b. False
a. True
Bending the float tab is an acceptable way to raise or lower the float in a float type carburetor. a. True b. False
a. True
The metering force (pressure differential) in most carburetors decreases as the throttle opening is decreased. a. True b. False
a. True
* The purpose of a three-way propeller valve is to a. direct oil from the engine oil system to the propeller cyclinder. b. permit constant-speed operation of the propeller. c. direct oil from the engine through the governor to the propeller.
a. direct oil from the engine oil system to the propeller cyclinder.
Which carburetor system operates at high speeds to reduce burning temperatures and prevent detonation? a. economizer valve b. automatic mixture control c. venturi
a. economizer valve
* The primary purpose of a feathering propeller is to a. eliminate the drag created by a windmilling propeller when an engine fails in flight. b. prevent further engine damage when an engine fails in flight. c. prevent propeller damage when an engine fails in flight.
a. eliminate the drag created by a windmilling propeller when an engine fails in flight.
What is used in the TCM fuel injection system to control the injector pump output pressure? a. engine speed b. oil pressure c. flyweight position d. prop RPM
a. engine speed
An A&P mechanic in the field my adjust all of the below EXCEPT a. fuel nozzle calibration b. idle speed adjustment c. idle mixture adjustment
a. fuel nozzle calibration
The _______ _____________ position produces the maximum number of magnetic lines of force. a. full register b. half register c. fully open d. half open
a. full register
What is a downside to having a pusher propeller? a. ground damage b. reduced thrust c. more complex installation
a. ground damage
During an underspeed condition, the flyweights in a propeller governor move a. in b. out c. no change
a. in during underspeed, weights move in to lower the torque required on each blade
Counterweights in propellers are generally used to aid in a. increasing blade angle b. decreasing blade angle c. unfeathering the propellers
a. increasing blade angle
The float chamber provides a(n) ____________ level of fuel to the main discharge nozzle. a. nearly constant b. decreasing c. increasing
a. nearly constant
When checking an ignition switch after installation with the switch in the OFF position, using an ohmmeter, the meter shows: a. no resistance b. infinite resistance c. battery voltage
a. no resistance
After installation of an ignition switch, and using an ohmmeter to check, what reading would you expect to see when the switch is in the ON position? a. open circuit/infinite resistance b. complete circuit/no resistance c. voltage
a. open circuit/infinite resistance
Which fuel control unit operates on the principle of a closed, pressurized fuel system? a. pressure injection carburetor b. continental fuel injection system c. float carburetor
a. pressure injection carburetor
* On most reciprocating multi-engine aircraft, automatic propeller synchronization is accomplished through the actuation of the a. propeller governors. b. throttle levers. c. propeller control levers.
a. propeller governors.
The Angle of Attack is the angle between the blade chord and the a. relative wind b. plane of rotation c. blade face
a. relative wind
If you are sitting on the ramp in a long line of aircraft ahead of you, which fuel mixture should you have? a. rich b. lean c. doesn't matter
a. rich
If the float is set too high in the float chamber what is the result? a. richer mixture b. leaner mixtures c. no fuel flow
a. richer mixture
What is the force where the loads tend to bend the propeller blades forward as the aircraft is pulled through the air? a. thrust bending b. aerodynamic twisting c. torque bending
a. thrust bending
A fuel rating of 100 has the same anti-knock properties as octane a. true b. false
a. true
As the volume of air that flows through a venturi increases, the pressure decreases a. true b. false
a. true
Carburetors control the weight of fuel for a given weight of air a. true b. false
a. true
E-Gap is typically 10-15 degrees past the neutral position of the rotating magnet in the magneto a. true b. false
a. true
Geometric pitch is usually expressed in pitch inches. a. true b. false
a. true
Mixture control is provided to lean the mixture and compensate for natural enrichment as the aircraft altitude increases. a. true b. false
a. true
The EGT increases as the F/A mixture is leaned out a. true b. false
a. true
The propeller is the unit which much absorb the power output of the engine a. true b. false
a. true
There are several forces acting on the propeller as it turns, one of the major forces is centrifugal force. a. true b. false
a. true
The air measuring unit in the carburetor is the _________. a. venturi b. automatic mixture control c. discharge nozzle
a. venturi
If the ground wire of a magneto is disconnected at the ignition switch, the result will be the: a) The engine will not start b) Engine will no stop running when the ignition switch is turned off c) Affected magneto will be isolated and the engine will run on the opposite magneto d) Engine will stop running
b) Engine will not stop running when the ignition switch is turned off
If the ground wire of a magneto is disconnected at the ignition switch, the result will be the a) Affected magneto will be isolated and the engine will run on the opposite magneto. b) Engine will not stop running when the ignition switch is turned off. c) The engine will not start d) Engine will stop running.
b) Engine will not stop running when the ignition switch is turned off.
Where is the voltage supplied *to* in a starting vibrator system? a) From the battery b) It delivers voltage to the primary coil of the magneto c) It delivers voltage to the secondary coil of the magneto
b) It delivers voltage to the primary coil of the magneto
When the ignition switch of a single (reciprocating) engine aircraft is turned to the OFF position, a) the secondary circuits of both magnetos are opened. b) the primary circuits of both magnetos are grounded. c) all circuits are automatically opened. d) there will be a slight increase in RPM before the engine stops
b) The primary circuits of both magnetos are grounded.
Place the following steps for the internal timing of a magneto in their proper order. 1) Hook up timing light 2) Pointer aimed at 0 degrees 3) Adjust points to JUST open and lock down 4) Start with magnet in neutral 5) Turn E-gap & lock down a. 1, 4, 3, 2, 5 b. 4, 2, 5, 1, 3 c. 4, 2, 3, 5, 1
b. 4, 2, 5, 1, 3 4) Start with magnet in neutral 2) Pointer aimed at 0 degrees 5) Turn E-gap & lock down 1) Hook up timing light 3) Adjust points to JUST open and lock down
Place the following events in correct sequence for the operation of an impulse coupling. 1) Lug moves forward and strikes heel of flyweight 2) Spring inside housing is being wound 3) Causes flyweight to rotate OFF the stop pin 4) Centrifugal force generated by rotation then acts through the CG of the flyweight, rotating the tail out and the toe in. 5) Allows spring to rapidly spin rotor 6) Flyweight toe engages the stop pin a. 6, 2, 3, 1, 5, 4 b. 6, 2, 1, 3, 5, 4 c. 1, 2, 6, 5, 3, 4
b. 6, 2, 1, 3, 5, 4 6) Flyweight toe engages the stop pin 2) Spring inside housing is being wound 1) Lug moves forward and strikes heel of flyweight 3) Causes flyweight to rotate OFF the stop pin 5) Allows spring to rapidly spin rotor 4) Centrifugal force generated by rotation then acts through the CG of the flyweight, rotating the tail out and the toe in.
If the ignition switch is moved from BOTH to either LEFT or RIGHT during a magneto check, a normal operation is usually indicated by a. No change in RPM b. A slight drop in RPM c. A momentary interruption of both ignition systems.
b. A slight drop in RPM
When performing a magneto ground check on an engine, correct operation is indicated by a. A slight increase in RPM. b. A slight drop in RPM. c. No drop in RPM. d. The engine shuts off
b. A slight drop in RPM.
What is the purpose of the cones on a propeller installation? a. Provide space between propeller hub and engine flange b. Align the propeller so it is centered on the shaft c. Hold bearings
b. Align the propeller so it is centered on the shaft
An aircraft engine continuous cylinder fuel injection system normally discharges fuel during which stroke(s)? a. Intake b. All (continuously) c. Intake and compression
b. All (continuously)
Why must a float type carburetor supply a rich mixture during idle? a. Engine operation at idle results in higher than normal volumetric efficiency. b. Because at idling speeds the engine may not have enough airflow around the cylinders to provide proper cooling. c. Because of reduced mechanical eefficiency during idle.
b. Because at idling speeds the engine may not have enough airflow around the cylinders to provide proper cooling.
* Which following statement about constant-speed counterweight propellers is also true when referring to two-position counterweight propellers? a. The pilot selects the RPM and the propeller changes pitch to maintain the selected RPM. b. Blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal. c. Since an infinite number of blade angle positions are possible during fight, propeller efficiency is greatly improved.
b. Blade angle changes are accomplished by the use of two forces, one hydraulic and the other centrifugal.
* When the centrifugal force acting on the propeller governor flyweights overcomes the tension on the speeder spring, a propeller is in what speed condition? a. Blade angle will decrease and RPM will decrease. b. Blade angle will decrease and RPM will increase c. Blade angle will increase and RPM will decrease.
b. Blade angle will decrease and RPM will increase
A defective primary capacitor in a magneto is indicated by a. A fine-grained frosted appearance of the breaker points b. Burned and pitted breaker points c. A weak spark
b. Burned and pitted breaker points
* How is anti-icing fluid ejected from the slinger ring on a propeller. a. By centripetal force. b. By centrifugal force. c. By pump pressure.
b. By centrifugal force.
Which chamber in the regulator unit will have the lowest air pressure? a. Chamber A b. Chamber B c. Chamber C
b. Chamber B
What is the last activity to be performed when overhauling a magneto? a. Run magneto on test stand to ensure acceptable operation b. Complete maintenance entry in log book c. Research any service bulletins or ADs required
b. Complete maintenance entry in log book
* What action takes place when the cockpit control lever for a hydromatic, constant-speed propeller is actuated? a. The governor booster pump pressure is varied. b. Compression of the speeder spring is changed. c. The governor bypass valve is positioned to direct oil pressure to the propeller dome.
b. Compression of the speeder spring is changed. hard one, literally no idea what the question is asking
A cycling timer is part of which system? a. Synchrophasing b. De-icing c. Anti-icing
b. De-icing
When the flyweights move out, this causes the engine RPM to a. Increase b. Decrease c. No change
b. Decrease
A "Shower of Sparks" system utilizes a battery to provide spark to the spark plugs a. True b. False
b. False
If the impulse coupling is magnetized the corrective action is to remove and demagnetize the impulse coupling, test for coming in speed, and reinstall. a. True b. False
b. False
Less air tends to make carburetors run leaner at altitude than at ground level. a. True b. False
b. False
On a Bendix RSA fuel injection system, in addition to adjusting idle mixture and idle speed, a field A&P mechanic may also adjust the calibration of fuel nozzles a. True b. False
b. False
The carburetor must measure the fuel flow through the fuel system and use this measurement to regulate the amount of fuel discharged into the airstream. a. True b. False
b. False
Which one of these is NOT a result of having a restriction in the fuel nozzles? a. Nozzle pressure will increase b. Flow meter gauge will indicate decrease in fuel flow c. Rough engine operation
b. Flow meter gauge will indicate decrease in fuel flow
* What actuates the pilot valve in the governor of a constant-speed propeller? a. Engine oil pressure. b. Governor flyweights. c. Governor pump oil pressure.
b. Governor flyweights.
For a McCauley non-feathering constant-speed propeller, what is the force that increases the blade pitch for THIS propeller type? a. Counterweights b. Governor oil pressure c. Air pressure
b. Governor oil pressure
* Propeller fluid anti-icing systems generally use which of the following? a. Ethyl alcohol. b. Isopropyl alcohol. c. Ethylene glycol.
b. Isopropyl alcohol.
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? a. It will become leaner b. It will become richer c. No change will occur until the altitude changes
b. It will become richer
* 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? a. Low pitch through reverse pitch to feather position. b. Low pitch through high pitch to feather position. c. High pitch through low pitch to feather position.
b. Low pitch through high pitch to feather position.
When adjusting the float on a float type carburetor, the addition of shims under the set a. Raises the fuel level in the float chamber b. Lowers the fuel level in the float chamber c. Leans the fuel/air mixture
b. Lowers the fuel level in the float chamber
Why does a carburetor supply a rich mixture at idle? a. Engine has higher volumetric efficiency b. Not enough airflow around cylinders for cooling c. Reduce mechanical efficiency
b. Not enough airflow around cylinders for cooling
What is the engine crankshaft position when installing a magneto on the engine? a. Piston in the #1 cylinder must be at TDC on the compression stroke b. Piston in the #1 cylinder must be at prescribed number of degrees before TDC on the compression stroke c. Piston in the #1 cylinder must be at a prescribed number of degrees before TDC on the intake stroke
b. Piston in the #1 cylinder must be at prescribed number of degrees before TDC on the compression stroke crankshaft, compression
From the Magneto Inductor Vibrator Circuit video, once the retard magneto points open around Top Dead Center (TDC) the pulsating DC goes through the _____________________? a. rotating magnet b. primary coil windings c. secondary coil windings
b. Primary Coil Windings
On most reciprocating multiengine aircraft, automatic propeller synchronization is accomplished through the actuation of the a. Throttle levers b. Propeller governors c. Propeller control levers
b. Propeller governors
* What is a function of the automatic propeller synchronizing systems on mulit-engine aircraft? a. To control the power output of all engines. b. To control the engine RPM and reduce vibration. c. To control the tip speed of all propellers.
b. To control the engine RPM and reduce vibration.
* Why is the pulley stop screw on a propeller governor adjustable? a. To limit the maximum propeller pitch for takeoff. b. To limit the maximum engine speed during takeoff. c. To maintain the proper blade angle for crusing.
b. To limit the maximum engine speed during takeoff.
* Why is a constant-speed counterweight propeller normally placed in HIGH PITCH position before the engine is stopped? a. To prevent hydraulic lock of the piston when the oil cools. b. To prevent exposure and corrosion of the pitch changing mechanism. c. To prevent overheating of the engine during the next start.
b. To prevent exposure and corrosion of the pitch changing mechanism.
The piston-type economizer operates under what principle? a. A piston is used to pump extra fuel into the discharge nozzle at higher power settings b. Two pistons are used, one controls the flow of extra fuel, while the other controls an airbleed c. One piston is used, and it controls the main airbleed
b. Two pistons are used, one controls the flow of extra fuel, while the other controls an airbleed
How does a back suction mixture control system operate? a. Varying the pressure within the venturi b. Varying the pressure on the fuel in the float chamber c. Changing the cross-sectional area of the metering jet
b. Varying the pressure on the fuel in the float chamber
The metered fuel pressure (chamber C) in an injection-type carburetor a. Varies according to the position of the poppet valve b. Will be approximately equal to the pressure in chamber A c. Is held constant throughout the entire engine operating range
b. Will be approximately equal to the pressure in chamber A
What operational force tends to increase propeller blade angle? a. centrifugal twisting b. aerodynamic twisting c. thrust bending
b. aerodynamic twisting centrifugal is low blade angle, aerodynamic is high. A is higher in the alphabet than C
The spark is induced in a magneto ignition system when the breaker points are a. fully open b. beginning to open c. fully closed
b. beginning to open
Aviation fuels are generally colored by their type. 100LL avgas is colored a. yellow b. blue c. red
b. blue
What operational force causes the greatest stress on a propeller? a. aerodynamic twisting force b. centrifugal force c. thrust bending force
b. centrifugal force
* During the on-speed condition of a propeller, the a. centrifugal force acting on the governor flyweights is greater than the tension of the speeder spring. b. centrifugal force of the governor flyweights is equal to the speeder spring force. c. tension on the speeder spring is less than the centrifugal force acting on the governor flyweights.
b. centrifugal force of the governor flyweights is equal to the speeder spring force.
As an aircraft accelerates the pressure in Chamber B will a. increase. b. decrease. c. remain the same.
b. decrease.
Aerodynamic twisting force is greater than centrifugal twisting force. a. true b. false
b. false
Aviation gasoline is defined by its lead rating a. true b. false
b. false
Constant speed propellers have no pilot controls and require no adjustments in flight. a. true b. false
b. false
During takeoff, when maximum power and thrust are required, the constant-speed propeller is at high propeller blade angle or pitch. a. true b. false
b. false
For takeoff, you want a high pitch propeller and not a low pitch propeller a. true b. false
b. false
Ignition switches work the same as all other switches on the aircraft. When they are in the OFF position, the circuit is "broken" or "open" a. true b. false
b. false
In a low-tension magneto system the low voltage is stepped up by a transformer in the distribution cap a. true b. false
b. false
In the Bendix RSA fuel injection system, idle mixture and idle speed are adjusted at a repair shop after overhaul. a. true b. false
b. false
More air is drawn into the engine as altitude increases. a. true b. false
b. false
Tetraethyl lead is an additive to gasoline that adds more octane to fuel a. true b. false
b. false
The feed shoes of a de-icing system are molded with several parallel open channels in which fluid flows from the blade shank toward the blade tip by centrifugal force. a. true b. false
b. false
The higher the octane rating, the greater the fuel's resistance to combustion due to heat and pressure a. true b. false
b. false
The magneto is directly grounded to the airframe a. true b. false
b. false
The main discharge nozzle is located at the widest part of the venturi a. true b. false
b. false
Which is NOT an essential subsystem of a float-type carburetor? a. economizer system b. fuel delivery system c. accelerating system d. idling system
b. fuel delivery system
The distance a propeller travels through a solid object in one revolution is called a. effective pitch b. geometric pitch c. slip
b. geometric pitch
What is the distance a propeller should advance in one revolution with no slippage called? a. effective pitch inches b. geometric pitch inches c. slip
b. geometric pitch inches
Which is NOT a cause of vapor lock? a. lowering the pressure on the fuel b. high humidity c. high fuel temperatures
b. high humidity
Blade stations are measured from the a. index mark on the blade shank b. hub centerline c. blade base
b. hub centerline
The type of ice that forms in the float carburetor when there is snow and ice in the air that accumulates on the air filter. a. clear ice b. impact ice c. throttle ice
b. impact ice
* Assumption: A powerplant using a hydraulically controlled constant-speed propeller is operating within the propellers constant-speed range at a fixed throttle setting. Question: 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 a. decrease, engine manifold pressure will increase, and engine RPM will decrease. b. increase, engine manifold pressure will increase, and engine RPM will decrease. c. decrease, engine manifold pressure will decrease, and engine RPM will increase.
b. increase, engine manifold pressure will increase, and engine RPM will decrease.
As an aircraft's speed is increased, the voltage induced in the primary coil of the magneto a. remains constant b. increases c. varies with the setting of the voltage regulator
b. increases
* Manually feathering a hydro-mechanical propeller means to a. port governor oil pressure to the cylinder of the propeller. b. port governor oil pressure from the cylinder of the propeller. c. block governor oil pressure to the cylinder of the propeller.
b. port governor oil pressure from the cylinder of the propeller. take oil pressure away to let blade flutter
The centrifugal twisting moment of an operating propeller tends to a. increase pitch angle b. reduce pitch angle c. bend the blades in the direction of rotation
b. reduce pitch angle
* During engine operation at speeds lower than those for which the constant speed propeller control can govern in the INCREAESE RPM position, the propeller will a. maintain engine RPM in the normal manner until the HIGH PITCH stop is reached. b. remain in the full LOW PITCH position. c. remain in the full HIGH PTICH position.
b. remain in the full LOW PITCH position.
A carburetor is equipped with a mixture control to prevent the mixture from becoming too: a. lean at high altitudes b. rich at high altitudes c. rich at high speeds
b. rich at high altitutes
The blade angle of a fixed pitch propeller a. is greatest at the tip b. is smallest at the tip c. increases in proportion to the distance each section is from the hub
b. smallest at the tip
Which system of a float type carburetor is used to discharge an additional quantity of fuel into the carburetor airstream, when the throttle is opened suddenly? a. the power enrichment system b. the accelerating system b. the mixture control system
b. the accelerating system
A telltale sign of carburetor ice is a. the engine running hot. b. the engine RPM decreasing for no reason. c. the cabin heat quits working.
b. the engine RPM decreasing for no reason.
Which starting system is totally mechanical? a) Shower of sparks b) Booster coil c) Impulse coupling
c) Impulse coupling
In a Precision Airmotive, or Bendix RSA, fuel control system, place the following steps in sequence in order to control the amount of fuel sent to the nozzles starting with "A mass of air enters the engine." a. Fuel flows to the nozzles b. The air diaphragm moves the valve c. Air acts on a diaphrahm d. The ball valves moves in or out of the line between the regulator and flow divider
c, b, d, a Air acts on a diaphrahm The air diaphragm moves the valve The ball valves moves in or out of the line between the regulator and flow divider Fuel flows to the nozzles
A mixture ratio of 11:1 normally refers to a. A stoichiometric mixture b. 1 part air to 11 parts fuel c. 1 part fuel to 11 parts air
c. 1 part fuel to 11 parts air
* What normally prevents a Hartzell Compact propeller from going to feather when the engine is shut down on the ground? a. Accumulator provided oil pressure. b. Propeller cylinder air pressure. c. A latch mechanism composed of springs and lock pins.
c. A latch mechanism composed of springs and lock pins.
Which of the following engine operation problems is NOT caused by contact assemblies? a. Hard starting b. Engine roughness c. Both can be caused by problems with contact assemblies
c. Both can be caused by problems with contact assemblies
* How is aircraft electrical power for propeller deicer systems transferred from the engine to the propeller hub assembly? a. By flexible electrical connectors. b. By slip rings and segments plates. c. By slip rings and brushes.
c. By slip rings and brushes.
Which of the following forces or combination of forces operates to move the blades of a constant-speed counterweight-type propeller to the HIGH PITCH position? a. Engine oil pressure acting on the propeller piston-cylinder arrangement and centrifugal force acting on the counterweights b. Prop governor oil pressure acting on the propeller piston-cylinder arrangement c. Centrifugal force acting on the counterweights
c. Centrifugal force acting on the counterweights centrifugal force pushes counterweights out, which raises pitch
A swirl well is used in the fuel pump of which fuel metering system? a. Carburetor b. Bendix RSA fuel injection c. Continental
c. Continental
The autofeather system is used during all of the below except a. Takeoff. b. Landing. c. Cruise.
c. Cruise.
If the impulse coupling is not operating correctly, the result to engine operation is a. Engine roughness b. Magneto drop-off out of limits c. Hard starting
c. Hard starting
What type of ice is considered the worst since it develops in both carburetors and fuel injection systems? a. Fuel evaporation or refrigeration b. Throttle c. Impact
c. Impact
In a high tension ignition system, the current in the magneto secondary winding is a. Conducted from the primary winding via the discharge of the capacitor b. Induced when the primary circuit discharges via the breaker points c. Induced when the primary circuit is interrupted d. Is located as close to the spark plug as possible.
c. Induced when the primary circuit is interrupted
From the Magneto Inductor Vibrator Circuit video, which of the following is NOT a component of the system? a. right magneto b. battery c. left magneto
c. Left Magneto
* To reduce the power output of an engine equipped with a constant-speed propeller and operating maximum BMEP, the a. Manifold pressure is reduced with the propeller control before the RPM is reduced with the throttle control. b. RPM is reduced with the propeller control before the manifold pressure is reduced with the throttle control. c. Manifold pressure is reduced with the throttle control before the RPM is reduced with the propeller control.
c. Manifold pressure is reduced with the throttle control before the RPM is reduced with the propeller control.
Which one of the following is not a contributor to impact ice? a. Ambient temperature is below zero b. Flying through visible moisture c. More volatile fuels
c. More volatile fuels
The propeller governor controls the a. Spring tension on the boost pump speeder spring b. Linkage and counterweights from moving in and out c. Oil to and from the pitch changing mechanism
c. Oil to and from the pitch changing mechanism
What information is NOT required to be printed on a propeller? a. Type certificate number b. Serial number c. Part number
c. Part number
The measure of the power output of an engine absorbed by the propeller is a. Shaft horsepower b. Centrifugal force c. Propeller load
c. Propeller load
The application of carburetor heat will have which of the following effects? a. The manifold pressure will be increased b. The mixture will become leaner c. The mixture will become richer
c. The mixture will become richer I guess because this melts ice that is restricting airflow, thus increasing airflow and increasing cooling, therefore resulting in a richer mixture
When the ignition switch of a single (reciprocating) engine aircraft is turned to the OFF position, a. There will be a slight increase in RPM before the engine stops b. The secondary circuits of both magnetos are opened. c. The primary circuits of both magnetos are grounded. d. All circuits are automatically opened.
c. The primary circuits of both magnetos are grounded.
When timing a magneto to an engine, which is NOT a way to set the correct timing on the propeller? a. "Flower pot" attached to prop spinner b. Timing marks on starter ring and timing hole on starter c. Timing marks on back of propeller and sight gauge in propeller cylinder
c. Timing marks on back of propeller and sight gauge in propeller cylinder
What is the purpose of an arbor used in balancing a propeller? a. To support the propeller on the balance knives b. To mark the propeller blades where weights are to be attached c. To level the balance stand
c. To level the balance stand
Which of the following conditions would most likely lead to detonation? a. Late ignition timing b. Use of fuel with too high an octane rating c. Use of fuel with too low an octane rating
c. Use of fuel with too low an octane rating
Which of the following are NOT sections in a Bendix RSA fuel injector? a. regulator section b. airflow section c. accelerating section
c. accelerating section
Which force tends to turn the blades to a high blade angle? a. centrifugal twisting b. torque bending c. aerodynamic twisting
c. aerodynamic twisting
The primary purpose of the air bleed openings used with continuous flow fuel injector nozzle is to a. provide for automatic mixture control. b. lean out the mixture. c. aid in proper fuel vaporization.
c. aid in proper fuel vaporization.
Which force tries to force the blades toward a low blade angle? a. aerodynamic twisting b. centrifugal c. centrifugal twisting
c. centrifugal twisting
Ice formed where the fuel is introduced into the venturi is known as a. clear ice b. impact ice c. evaporation ice d. crushed ice
c. evaporation ice
* Proper operation of electric deicing boots on individual propeller blades may best be determined by a. feeling the boots to see if they are heating. b. observing the ammeter or loadmeter for current flow. c. feeling the sequence of boot heating and have an assistant observe the loadmeter indications.
c. feeling the sequence of boot heating and have an assistant observe the loadmeter indications.
In the Bendix RSA fuel injector, the air metering section is attached to the ___________________ section. a. accelerator section b. air metering c. fuel metering
c. fuel metering
Which is NOT a disadvantage of float type carburetors? a. does not allow inverted flight b. increased risk of carburetor ice c. higher risk of fuel system contamination
c. higher risk of fuel system contamination
* An increase in manifold pressure with a constant RPM will cause the bearing load in an engine to a. decrease. b. remain relatively constant. c. increase.
c. increase.
The economizer system in a float type carburetor _____ a. keeps the fuel/air ratio constant. b. functions only at cruise and idle speeds. c. increases the fuel/air mixture at high power settings.
c. increases the fuel/air mixture at high power settings.
In a polar inductor magneto, which component rotates? a. primary winding b. horseshoe magnet c. magnetic poles
c. magnetic poles
* When engine power is increased, the constant-speed propeller tried to function so that it will a. maintain the RPM, decrease the blade angle, and maintain a low angle of attack. b. increase the RPM, decrease the blade angle, and maintain a low angle of attack. c. maintain the RPM, increase the blade angle, and maintain a low angle of attack.
c. maintain the RPM, increase the blade angle, and maintain a low angle of attack. doesn't want to spin faster bc it's constant speed, and higher blade angle exposes more of blade to the wind
* Constant-speed non-feathering McCauley, Hartzell, and other propellers of similar design without counter-weights increase pitch angle using a. centrifugal twisting moment. b. spring pressure. c. oil pressure.
c. oil pressure.
When the switch is off in a battery ignition system, the primary circuit is a. grounded b. shorted c. opened d. shunted to the closed position
c. opened
Which of the systems below is NOT a type of mixture control system? a. back suction b. needle type c. plug type
c. plug type
Which is NOT a type of economizer? a. needle type b. piston type c. plunger type
c. plunger type
Aviation fuels are generally colored by their type. 80 octane avgas is colored a. yellow b. blue c. red
c. red
All of the following are part of a propeller de-icing system except a. system controls b. resistance heating element c. slinger ring
c. slinger ring
* The low pitch stop on a constant-speed propeller is usually set so that a. maximum allowable engine RPM cannot be exceeded with any combination of manifold pressure, altitude, or forward speed. b. the limiting engine manifold pressure cannot be exceeded with any combination of throttle opening, altitude, or forward speed. c. the engine will turn at its rated takeoff RPM at seal level when the throttle is opened to allowable takeoff manifold pressure.
c. the engine will turn at its rated takeoff RPM at seal level when the throttle is opened to allowable takeoff manifold pressure.
Why is a fuel injected "difficult" to start within 30 minutes of shutdown? a. the spark plugs have not cooled down enough to create a hot spark to light off the mixture b. with the engine hot, the air is too "thin" to light off c. the heat from the engine may have caused the fuel in the fuel lines from the flow divider to the nozzle to have evaporated d. all the fuel has drained from the float bowl and there is no flow through the venturi to get the mixture into the cylinders
c. the heat from the engine may have caused the fuel in the fuel lines from the flow divider to the nozzle to have evaporated
On an aircraft reciprocating engine, carburetor ice is removed by a. not flying in summer. b. not flying in the clouds. c. the use of carb heat.
c. the use of carb heat.
What is the force in the form of air resistance that tends to bend the propeller blades opposite to the direction of rotation? a. centrifugal twisting b. aerodynamic twisting c. torque bending
c. torque bending
Which engines use shrouded fuel nozzles when there is a Bendix RSA fuel injection system? a. ambient air engines b. carburetor engines c. turbosupercharger engine
c. turbosupercharger engine
Which is NOT a way a mixture control system manages the fuel to air mixture? a. vary the size of the fuel orifice b. vary the pressure differential c. vary the pressure of the fuel from the pump
c. vary the pressure of the fuel from the pump
The carburetor component that measures the amount or volume of air that is delivered to the engine is the a. economizer valve b. automatic mixture control c. venturi
c. venturi
What is the difference between a low tension and a high tension engine ignition system? a) A high tension system is designed for high altitude aircraft, while a low tension system is for low to medium altitude aircraft. b) A low tension system will have a dedicated blast tube to keep it cool since they run hotter c) A low tension system produces relatively low voltage at the spark plug as compared to a high tension system. d) 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.
d) 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.
Failure of an engine to cease firing after turning the magneto switch off is an indication of a) An open high tension lead. b) The mixture control is not adjusted correctly. c) Grounded magneto switch. d) An open P-lead to ground.
d) An open P-lead to ground.
If an aircraft ignition switch is turned off and the engine continues to run normally, the trouble is probably caused by a) primary lead grounding b) arcing magneto breaker points c) this is normal, if the RPM is in the green arc d) an open ground lead in the magneto.
d) An open ground lead in the magneto
An indication that carburetor ice was present is/are a. the engine may "cough" as the water passes through. b. engine RPM will slowly decrease in cruise configuration. c. engine RPM will increase when carb heat is pulled on. d. all of the above
d. all of the above
The high-tension magneto system can be divided into 3 distinct circuits: ______________ _______________ and __________
magnetic primary secondary
