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Powerplant Writtens > Engine Instrument Systems > Flashcards

Engine Instrument Systems Flashcards

1
Q

Which unit most accurately indicates fuel consumption of a reciprocating engine?

A

Fuel flowmeter.

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2
Q

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 what?

A

fuel nozzles.

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3
Q

The principal fault in thep 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 what?

A

higher-than-normal fuel flow indication.

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4
Q

Motor-driven impeller and turbine fuel flow transmitters are designed to transmit data…

A

using aircraft electrical system power.

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5
Q

The fuel flowmeter indicator rotor and needle for a motor-impeller and turbine indicating system is driven by what?

A

an electrical signal.

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6
Q

On a twin-engine aircraft with fuel-injected reciprocating engines, one fuel flowmeter reads considerably higher than the other in all engine operating configurations. What is the probable cause of this indication?

A

One or more fuel nozzles are clogged.

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7
Q

The fuel flow indication system used with many fuel-injected opposed engine airplanes utilizes a measure of what?

A

fuel pressure.

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8
Q

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 settings.
  4. Fuel temperature.
A

Three.

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9
Q

The fuel flow indication data sent from motor driven impeller and turbine, and motor less type fuel flow transmitters is a measure of what?

A

fuel mass flow.

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10
Q

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 what?

A

an increased fuel flow indication on the gauge.

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11
Q

A manifold pressure gauge is designed to what?

A

indicate absolute pressure in the intake manifold.

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12
Q

The purpose of an exhaust gas analyzer is to indicate the what?

A

fuel/air ratio being burned in the cylinders.

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13
Q

Which of the following types of electric motors are commonly used in electric tachometers?

A

Synchronous motors.

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14
Q

Where are the hot and cold junctions located in an engine cylinder temperature indicating system?

A

The hot junction is located at the cylinder and the cold junction is located at the instrument.

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15
Q

Basically, the indicator of a tachometer system is responsive to change in what?

A

frequency.

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16
Q

Which statement is correct concerning a thermocouple-type temperature indicating instrument system?

A

It requires no external power source.

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17
Q

Which statement is true regarding a thermocouple type cylinder head temperatures measuring system?

A

The voltage output of a thermocouple system is determined by the temperature difference between two ends of the thermocouple.

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18
Q

What basic meter is used to indicate cylinder head temperatures in most aircraft?

A

Galvanometer.

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19
Q

Which of the following is a primary engine instrument?

A

tachometer.

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20
Q

A complete break in the line between the manifold pressure gauge and the induction system will be indicated by the gauge registering what?

A

prevailing atmospheric pressure.

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21
Q

Engine oil temperature gauges indicate the temperature of the oil…

A

entering the engine.

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22
Q

Why do helicopters require a minimum of two synchronous tachometer systems?

A

One indicates engine RPM and the other main rotor RPM.

23
Q

If the thermocouple leads were inadvertently crossed at installation, what would the cylinder temperature gauge pointer indicate?

A

Moves off-scale on the zero side of the meter.

24
Q

A common type of electrically operated oil temperature gauge utilizes what?

A

either a wheatstone bridge or a ratiometer circuit.

25
Q

The indication on a thermocouple-type cylinder head temperatures indicator is produced by what?

A

a current generated by the temperature difference between dissimilar metal hot and cold junctions.

26
Q

(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 1 and 3 are true.

27
Q

Thermocouples leads…

A

are designed for a specific installation and may not be altered.

28
Q

The thermocouple leads used to measure cylinder temperature on an aircraft reciprocating engine…

A

are connected to the electrical wiring on one end and the cylinder on the other end.

29
Q

(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 1 is true.

30
Q

What unit in a tachometer system sends information to the indicator?

A

the three-phase AC generator.

31
Q

(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,

A

Both 1 and 2 are true.

32
Q

Engine pressure ratio is determined by what?

A

dividing turbine outlet total pressure by engine inlet total pressure.

33
Q

Turbine engine EGT thermocouples are constructed of what?

A

chromel and alumel.

34
Q

Which of the following instrument discrepancies require replacement of the instrument?

A

Glass cracked, will not zero out, pointer loose on shaft, fogged.

35
Q

A Bourdon-tube instrument may be used to indicate what?

A

pressure and temperature.

36
Q

An indication of unregulated power changes that result in continual drift manifold pressure indication on a turbosupercharged aircraft engine is known as what?

A

Bootstrapping.

37
Q

Which of the following instrument conditions is acceptable and does not require immediate correction?

A

Case paint chipped.

38
Q

A change in engine manifold pressure has a direct effect on the what?

A

mean effective cylinder pressure.

39
Q

What instrument on a gas turbine engine should be monitored to minimize the possibility of a “hot” start?

A

Turbine inlet temperature.

40
Q

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.

41
Q

On an aircraft turbine engine, operating at a constant power, the application of engine anti-icing will result in what?

A

noticeable shift in EPR.

42
Q

Engine pressure ratio is the total pressure ratio between the what?

A

front of the compressor and the rear of the turbine.

43
Q

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?

A

Turbine damage or loss of turbine efficiency.

44
Q

What is the primary purpose of the tachometer on an axial-compressor turbine engine?

A

Monitor engine RPM during starting and to indicate over speed conditions.

45
Q

The engine pressure ratio (EPR) indicator is a direct indication of what?

A

engine thrust being produced.

46
Q

The exhaust gas temperature (EGT) indicator on a gas turbine engine provides a relative indication of the what?

A

turbine inlet temperature.

47
Q

What instrument indicates the thrust of a gas turbine engine?

A

Engine pressure ratio indicator.

48
Q

In a turbine engine, where is the turbine discharge pressure indicator sensor located?

A

Immediately aft of the last turbine stage.

49
Q

In what units are turbine engine tachometers calibrated?

A

Percent of engine pressure ratio.

50
Q

Instruments that provide readings of low or negative pressure, such as manifold pressure gauges, are usually what type?

A

Diaphragm of bellows.

51
Q

Instruments that measure relatively high fluid pressures, such as oil pressure gauges, are usually what type?

A

Bourdon tube.

52
Q

The RPM indication of a synchronous AC motor-tachometer is governed by the generator…

A

frequency.

53
Q

The EGT gauge used with reciprocating engines is primarily used to furnish temperature readings in order to what?

A

obtain the best mixture setting for fuel efficiency.

54
Q

A red triangle, dot, or diamond mark on an engine instrument face of glass indicates what?

A

the maximum limit for high transients such as starting.

Powerplant Writtens (28 decks)

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