Engine Instrument Systems-Powerplant
33 (8289) - Which of the following instrument discrepancies require replacement of the instrument?1. Red line missing from glass.2. Glass cracked.3. Case paint chipped.4. Will not zero out.5. Pointer loose on shaft.6. Mounting screw loose.7. Leaking at line B nut.8. Fogged.
B- 2, 4, 5, 8.
50 (8306) - Instruments that measure relatively high fluid pressures, such as oil pressure gauges, are usually what type?
B- Bourdon tube.
18 (8274) - What basic meter is used to indicate cylinder head temperature in most aircraft?
B- Galvanometer.
16 (8272) - Which statement is correct concerning a thermocouple-type temperature indicating instrument system?
B- It requires no external power source.
23 (8279) - If the thermocouple leads were inadvertently crossed at installation, what would the cylinder temperature gauge pointer indicate?
B- Moves off-scale on the zero side of the meter.
6 (8262) - On a twin-engine aircraft with fuel-injected reciprocating engines, one fuel-flow indicator reads considerably higher than the other in all engine operating configurations. What is the probable cause of this indication?
B- One or more fuel nozzles are clogged.
13 (8269) - Which of the following types of electric motors are commonly used in electric tachometers?
B- Synchronous motors.
17 (8273) - Which statement is true regarding a thermocouple-type cylinder head temperature measuring system?
B- The voltage output of a thermocouple system is determined by the temperature difference between the two ends of the thermocouple.
8 (8264) - In addition to fuel quantity, a computerized fuel system (CFS) with a totalizer-indicator provides indication of how many of the following?1. Fuel flow rate.2. Fuel used since reset or initial start-up.3. Fuel time remaining at current power setting.4. Fuel temperature.
B- Three.
38 (8294) - What instrument on a gas turbine engine should be monitored to minimize the possibility of a 'hot' start?
B- Turbine inlet temperature.
10 (8266) - 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
B- an increased fuel flow indication on the gauge.
27 (8283) - Thermocouple leads
B- are designed for a specific installation and may not be altered.
31 (8287) - Engine pressure ratio is determined by
B- dividing turbine outlet total pressure by engine inlet total pressure.
21 (8277) - Engine oil temperature gauges indicate the temperature of the oil
B- entering the engine.
15 (8271) - Basically, the indicator of a tachometer system is responsive to change in
B- frequency.
41 (8297) - Engine pressure ratio is the total pressure ratio between the
B- front of the compressor and the rear of the turbine.
2 (8258) - 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
B- fuel nozzles.
7 (8263) - The fuel-flow indication system used with many fuel-injected opposed engine airplanes utilizes a measure of
B- fuel pressure.
12 (8268) - The purpose of an exhaust gas analyzer is to indicate the
B- fuel/air ratio being burned in the cylinders.
53 (8309) - A red triangle, dot, or diamond mark on an engine instrument face or glass indicates
B- the maximum limit for high transients such as starting.
36 (8292) - Which of the following instrument conditions is acceptable and does NOT require immediate correction?1. Red line missing.2. Pointer loose on shaft.3. Glass cracked.4. Mounting screws loose.5. Case paint chipped.6. Leaking at line B nut.7. Will not zero out.8. Fogged.
C- 5
35 (8291) - An indication of unregulated power changes that result in continual drift of manifold pressure indication on a turbosupercharged aircraft engine is known as
C- Bootstrapping.
49 (8305) - Instruments that provide readings of low or negative pressure, such as manifold pressure gauges, are usually what type?
C- Diaphragm or bellows.
46 (8302) - What instrument indicates the thrust of a gas turbine engine?
C- Engine pressure ratio indicator.
47 (8303) - In a turbine engine, where is the turbine discharge pressure indicator sensor located?
C- Immediately aft of the last turbine stage.
43 (8299) - What is the primary purpose of the tachometer on an axial-compressor turbine engine?
C- Monitor engine RPM during starting and to indicate overspeed conditions.
22 (8278) - Why do helicopters require a minimum of two synchronous tachometer systems?
C- One indicates engine RPM and the other main rotor RPM.
14 (8270) - Where are the hot and cold junctions located in an engine cylinder temperature indicating system?
C- The hot junction is located at the cylinder and the cold junction is located at the instrument.
42 (8298) - What would be the possible cause if a gas turbine engine has high exhaust gas temperature, high fuel flow, and low RPM at all engine power settings?
C- Turbine damage or loss of turbine efficiency.
25 (8281) - The indication on a thermocouple-type cylinder head temperature indicator is produced by
C- a current generated by the temperature difference between dissimilar metal hot and cold junctions.
30 (8286) - (1) Generally, when a turbine engine indicates high EGT for a particular EPR (when there is no significant damage), it means that the engine is out of trim.(2) Some turbine-powered aircraft use RPM as the primary indicator of thrust produced, others use EPR as the primary indicator.Regarding the above statements,
C- both No. 1 and No. 2 are true.
51 (8307) - The RPM indication of a synchronous ac motor-tachometer is governed by the generator
C- frequency.
3 (8259) - 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
C- higher than normal fuel flow indication.
11 (8267) - A manifold pressure gauge is designed to
C- indicate absolute pressure in the intake manifold.
37 (8293) - A change in engine manifold pressure has a direct effect on the
C- mean effective cylinder pressure.
45 (8301) - The exhaust gas temperature (EGT) indicator on a gas turbine engine provides a relative indication of the
C- turbine inlet temperature.
34 (8290) - A Bourdon-tube instrument may be used to indicate1. pressure.2. temperature.3. position.4. quantity.
A- 1 and 2.
1 (8257) - Which unit most accurately indicates fuel consumption of a reciprocating engine?
A- Fuel flowmeter.
39 (8295) - In regard to using a turbine engine oil analysis program, which of the following is NOT true?
A- Generally, an accurate trend forecast may be made after an engine's first oil sample analysis.
48 (8304) - In what units are turbine engine tachometers calibrated?
A- Percent of engine RPM.
19 (8275) - Which of the following is a primary engine instrument?
A- Tachometer.
29 (8285) - What unit in a tachometer system sends information to the indicator?
A- The three-phase ac generator.
5 (8261) - The fuel-flow indicator rotor and needle for a motor-impeller and turbine indicating system is driven by
A- an electrical signal.
26 (8282) - (1) Powerplant instrument range markings show whether the current state of powerplant operation is normal, acceptable for a limited time, or unauthorized.(2) Powerplant instrument range markings are based on installed engine operating limits which may not exceed (but are not necessarily equal to) those limits shown on the engine Type Certificate Data Sheet.Regarding the above statements,
A- both No. 1 and No. 2 are true.
32 (8288) - Jet engine thermocouples are usually constructed of
A- chromel-alumel.
24 (8280) - A common type of electrically operated oil temperature gauge utilizes
A- either a wheatstone bridge or ratiometer circuit.
44 (8300) - The engine pressure ratio (EPR) indicator is a direct indication of
A- engine thrust being produced.
9 (8265) - The fuel-flow indication data sent from motor driven impeller and turbine, and motorless type fuel flow transmitters is a measure of
A- fuel mass-flow.
40 (8296) - On an aircraft turbine engine, operating at a constant power, the application of engine anti-icing will result in
A- noticeable shift in EPR.
52 (8308) - The EGT gauge used with reciprocating engines is primarily used to furnish temperature readings in order to
A- obtain the best mixture setting for fuel efficiency.
28 (8284) - (1) Engine pressure ratio (EPR) is a ratio of the exhaust gas pressure to the engine inlet air pressure, and indicates the thrust produced.(2) Engine pressure ratio (EPR) is a ratio of the exhaust gas pressure to the engine inlet air pressure, and indicates volumetric efficiency.Regarding the above statements,
A- only No. 1 is true.
20 (8276) - A complete break in the line between the manifold pressure gauge and the induction system will be indicated by the gauge registering
A- prevailing atmospheric pressure.
4 (8260) - Motor driven impeller and turbine fuel flow transmitters are designed to transmit data
A- using aircraft electrical system power.