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Powerplant > (Under Construction) > Flashcards

(Under Construction) Flashcards

1
Q

Turbojet and turbofan thrust reverser systems are generally powered by…

A

Hydraulic or pneumatic

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2
Q

What is required regarding aircraft fire protection systems?

-Illuminates a light on the flight deck which indicates location of fire

-Audible alarm

-Low number or no false alarms

-Resettable when fire is out

-Minimum electrical current requirements

-ALL the above

A

ALL the above

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3
Q

Which statement is true?
1. Some exhaust systems include an augmentor system to draw additional air over the engine for cooling.
2. Augmentor systems are used to create a low pressure area at the lower rear of the aircraft engine cowling.

A

Both are true

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4
Q

What does a booster coil on a radial engine operate off of?

A

Battery power and a trailing finger in the distributor

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5
Q

What is a common visual check of fire detection elements?

A

Cracked or broken sections

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6
Q

How does a fire detection system operate?

A

On the principle of building of a gas pressure within a tube proportional to a temp rise

Example: Lindberg pneumatic thermal system

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7
Q

What publication would be used to obtain crankshaft runout tolerances after a ground incident resulting in propeller sudden stoppage?

A

Current manufacturers maintenance manuals

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8
Q

What does a hissing sound from the carburetor indicate when the propeller is pulled through manually?

A

Intake valve blow-by

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9
Q

What is a manifold pressure gauge designed to indicate?

A

Absolute pressure in the intake manifold

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10
Q

What is a common method used to prevent carburetor icing?

A

Preheat the intake air

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11
Q

What must a QECA (quick-engine-change-assembly) be pre-approved by?

A

The administrator or an airframe and powerplant mechanic with inspection authorization

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12
Q

After control signals are sent from the Electronic Engine Control (EEC) to regulate fuel flow to the engine, what happens next?

A

Feedback from several systems in the engine is sent back to the EEC

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13
Q

How is aircraft electrical wire size measured?

A

According to American wire gauge (AWG)

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14
Q

Which of the following are NOT recommended markers for reciprocating engine exhaust systems?

A

Lead pencil

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15
Q

What does a movement of the propeller in the direction of engine rotation during a reciprocating engine compression check indicate?

A

The piston was positioned past top dead center

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16
Q

Compared to reciprocating engine oils, what do turbine engine oils have less tendency to produce?

A

Lacquer or coke

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17
Q

What increases pitch angle in constant speed non-feathering propellers like McCauley and Hartzell?

A

Oil pressure

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18
Q

How are cylinder head temperatures measured in a gas turbine engine?

A

By means of an indicator and a thermocouple sensing device

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19
Q

Where are fire protection systems mandatory?

A

On auxiliary power unit

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20
Q

For what primary purpose is a turbine engine fuel control unit trimmed?

A

To obtain maximum thrust output when desired

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21
Q

What percentage of the indicated horsepower on a modern aircraft engine may friction horsepower be?

A

10-15%

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22
Q

What is considered ground boosted engine manifold pressure?

A

Any manifold pressure above 30 inches Hg

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23
Q

What can cause hot spots that burn a hole in the combustion section liner on a turbine engine?

A

A misaligned fuel nozzle resulting in a flame that is not centered in the flame area

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24
Q

How are combustion liner walls cooled in a gas turbine engine?

A

By secondary airflow through the combustion chamber

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25
Q

How can a steel propeller hub be tested for cracks?

A

By magnetic particle inspection

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26
Q

How does high-tension ignition shielding tend to reduce radio interference?

A

Receives and grounds high frequency waves coming from the magneto and high tension ignition leads

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27
Q

How is a fire extinguishing agent distributed in the engine section?

A

By spray nozzles and perforated tubing

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28
Q

How may reciprocating engine exhaust system leaks be detected?

A

By signs of exhaust soot inside the cowling and on adjacent components

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29
Q

What happens when ice forms on propellers during flight?

A

Decreases thrust and causes excessive vibration

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30
Q

When should the combustion process be completed if fuel/air ratio is proper and ignition timing is correct?

A

20 to 30 degrees after top dead center at the beginning of the power stroke

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31
Q

What happens in a supervisory electronic engine control EEC if there is a fault that adversely affects engine operations?

A

Causes an immediate reversion to control by the hydromechanical fuel control unit

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32
Q

How can the condition of an engine be discerned in addition to changing oil regularly?

A

By the amount of metal chips found on the magnetic chip detector

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33
Q

What functions does engine oil perform in addition to lubrication?

A

Cools

Seals

Cleans

Prevents corrosion

Cushions impact loads

All the above

All functions are performed by engine oil

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34
Q

What are the two most common materials for conductors in aircraft applications?

A

Copper and aluminum

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35
Q

How should AN and MS electrical connectors be installed to reduce ground shorting possibility when separated for maintenance?

A

With the pin section on the ground side of the electrical circuit

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36
Q

Which statement is NOT true regarding using a turbine engine oil analysis program?

A

Generally

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37
Q

Prevents corrosion

A

All the above

This answer refers to the properties listed in the text

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38
Q

Cushions impact loads

A

All the above

This answer refers to the properties listed in the text

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39
Q

Two most common materials for conductors in aircraft applications

A

Copper and aluminum

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40
Q

Installation of AN and MS electrical connectors

A

Pin section on the ground side of the electrical circuit

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41
Q

Turbine engine oil analysis program

A

Generally, an accurate trend forecast may be made after an engine’s first oil sample analysis

Example sentence: Regular oil analysis helps in monitoring engine health.

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42
Q

Units turbine engine tachometers are calibrated in

A

Percent of engine RPM

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43
Q

Recommended maximum number of wires in wire bundles

A

75 wires

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44
Q

Timing of magneto breaker points

A

Greatest magnetic field stress exists in the magneto circuit

45
Q

Main bearing oil seals used in turbine engines

A

Labyrinth and/or carbon rubber

46
Q

Master rod bearings type

A

Plain

47
Q

Newton’s Third Law of Motion

A

For every action there is an equal and opposite reaction

48
Q

Factors in the selection of wire size in a particular application

A

Voltage drop, Allowable power loss, Current carrying capability

Factors 1, 4, and 5 from the text

49
Q

Variables for which trim valves are adjusted on a typical engine trim check chart

A

Ambient temperature and barometric pressure

50
Q

Oil source for propeller governor on a Pratt and Whitney PT-6 turboprop engine

A

The engine oil supply

51
Q

Part of cylinder walls where greatest amount of wear occurs in a normally operating engine

A

Near the top of the cylinder

52
Q

Commonly used source for carburetor air heat

A

Warm ducted air from around the exhaust system

53
Q

Clutch type in pneumatic starters

A

Manually engaged and automatically disengaged

54
Q

Unacceptable issue in reciprocating engine exhaust systems

A

Local hot spots

55
Q

Reason for using capacitor-type ignition system on turbine engines

A

High heat intensity spark

56
Q

Calculation of compression ratio of an engine

A

The volume of the cylinder at BDC divided by the volume of the cylinder at TDC

57
Q

Purpose of the crankcase of an aircraft engine

A

Is the foundation of the engine containing crankshaft bearings and cylinder pads

58
Q

Description of crankpin

A

Hardened by nitriding and is hollow to reduce weight

59
Q

Attachment method of cylinders to crankcase in aircraft engine

A

By studs mounted in threaded holes in the crankcase

60
Q

Energy source for turning the propeller on a turboprop engine

A

Additional turbine stages

61
Q

Indication of engine thrust from the engine pressure ratio indicator

A

Engine thrust being produced

62
Q

Design purpose of the exhaust section of a turbine engine

A

Impart a high exit velocity to the exhaust gasses

63
Q

Function of floating control thermostat in reciprocating engine installations

A

Controlling airflow through the oil cooler

64
Q

Purpose of exhaust cone assembly of a turbine engine

A

Straighten and collect the exhaust gasses into a solid exhaust jet

65
Q

General requirements for an aircraft engine

A

Have a good fuel economy, high durability, and be capable of sustained high power output

Additional requirements mentioned in the text

66
Q

Portion of heat generated by combustion in a typical aircraft reciprocating engine

A

Carried out with the exhaust gasses

67
Q

Heat engine predominantly used in aviation

A

Opposed-type engine

68
Q

Primary purpose of baffles and deflectors installed around cylinders of air-cooled aircraft engines

A

Force cooling air into close contact with all parts of the cylinder

69
Q

Primary purpose of the propeller

A

Change engine horsepower to thrust

70
Q

Purpose of a bellmouth inlet

A

Maximize the aerodynamic efficiency of the inlet

71
Q

Purpose of cascade vanes in a thrust reversing system

A

Turn the exhaust gasses forward just after exiting the exhaust nozzle

72
Q

Purpose of the engine inlet on a turbine engine

A

Provide a uniform and steady airflow to avoid compressor stall

73
Q

Receiving inspection for an engine needing to be overhauled

A

Includes checking the airworthiness directives, service bulletins and type certificate compliance

74
Q

Consideration for the resistance of the current return path through the aircraft

A

Structure is adequately bonded

75
Q

Type of ignition system used on most turbine aircraft engines

A

Capacitor discharge

76
Q

The purpose of the engine inlet on a turbine engine is to

A

Provide a uniform and steady airflow to avoid compressor stall

Example sentence: The engine inlet ensures the compressor receives consistent airflow.

77
Q

The receiving inspection for an engine needing to be overhauled

A

Includes checking the airworthiness directives, service bulletins and type certificate compliance

No additional information

78
Q

The resistance of the current return path through the aircraft is always considered negligible, provided the

A

Structure is adequately bonded

No additional information

79
Q

The type of ignition system used on most turbine aircraft engines is

A

Capacitor discharge

No additional information

80
Q

The wire identification code of aircraft wire is

A

The choice of the manufacturer

No additional information

81
Q

Thermal efficiency of an engine

A

Affects the fuel consumption of an engine

No additional information

82
Q

Thermocouples are usually inserted or installed on the

A

Hottest cylinder of the engine

No additional information

83
Q

Turbine engines produce noise primarily from engine air intake, vibration, and engine exhaust. Which of these is of the greatest concern?

A

Engine exhaust noise from the high velocity jet stream moving through a relatively quiet atmosphere

No additional information

84
Q

Turbine inlet nozzle assembly located on the upstream side of each turbine wheel are used in the gas turbine engine to

A

Increase the velocity of the gasses flowing past this point

No additional information

85
Q

Valve clearance changes on opposed-type engines using hydraulic lifters are accomplished by

A

Replacing the push rod

No additional information

86
Q

What component of a dual magneto is shared by both ignition systems?

A

Rotating magnet

No additional information

87
Q

What is the function of a blast tube as used on aircraft reciprocating engines?

A

A device to cool an engine accessory

No additional information

88
Q

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

A

Monitor engine RPM during starting and to indicate overspeed conditions

No additional information

89
Q

What type of fireproof connector is used in areas where it is vital that the electric current is not interrupted, even though the connector may be exposed to continuous open flame?

A

Class K connector

No additional information

90
Q

What type of nuts are used to hold an exhaust system to the cylinders?

A

Brass or heat-resistant high temperature locking nuts

No additional information

91
Q

What type of oil do most engine manufacturer’s recommend after new reciprocating engine break-in?

A

Straight mineral oil

No additional information

92
Q

When a reciprocating aircraft engine is started, what is the maximum time period to wait for an indication of oil pressure?

A

30 seconds

No additional information

93
Q

When internally timing a magneto, the breaker points begin to open when

A

The magnet poles are a few degrees beyond the neutral position

No additional information

94
Q

When mounting a replacement engine always,

A

Install the manufacturer specified bolts and torque to the manufacturer recommended value

No additional information

95
Q

When preparing to remove an engine, fuel valves must be

A

Fully closed even if they are solenoid operated

No additional information

96
Q

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

Overspeed

No additional information

97
Q

When trimming a turbine engine, the fuel control is adjusted to

A

Set idle RPIM and maximum RPM, indirectly affecting EPR

No additional information

98
Q

Where are sludge chambers, when used in aircraft lubrication systems, usually located?

A

In the crankshaft throws

No additional information

99
Q

Where is the oil temperature bulb usually located?

A

At the engine oil inlet

No additional information

100
Q

Which of the following generally renders an aluminum alloy propeller un-repairable?

A

Transverse cracks of any size

No additional information

101
Q

Which of the following is a function of the fuel/oil heat exchanger on a turbojet engine?

A

Increase fuel temperature

No additional information

102
Q

Which of the following is identified as the cambered or curved side of the propeller blade corresponding to the upper surface of a wing airfoil section? airfoil section?

A

Blade back

No additional information

103
Q

Which of the following is the safest fire-extinguishing agent?

A

Halon 1301

No additional information

104
Q

Which statement is correct regarding the ignition system of a turbine engine?

A

The system is normally de-energized as soon as the engine starts

No additional information

105
Q

Which statement is true concerning the inlet icing of turbine engines?

A

Most turboprop engines rely on electrical anti-icing

No additional information

106
Q

Which statement is true regarding proper throttle rigging of an airplane?

A

The throttle stop on the carburetor must be contacted before the stop in the cockpit

No additional information

107
Q

Which type of fuel control is used on most of today’s turbine engines?

A

Hydromechanical or electrical

No additional information

108
Q

Why are turbine engine igniters less susceptible to fouling than reciprocating engine spark plugs?

A

The high intensity spark cleans the igniter

No additional information

Powerplant (18 decks)

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