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A&P Powerplant > Induction And Cooling > Flashcards

Induction And Cooling Flashcards

1
Q

Decreased altitude will _____ air pressure.

A

Increase

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3
Q

Temperature will affect the ______ of air.

A

Density

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4
Q

Which of the following reduces engine performance?

High pressure
Low temperature
High humidity

A

High humidity

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5
Q

What are two things to consider in aircraft induction systems?

A

Filter ice and dirt.

Deliver balanced fuel and air mixture.

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6
Q

If a filter can be cleaned, in which direction should the cleaning solution flow?

A

opposite of the normal flow

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7
Q

Where can approved cleaning instructions for filter maintenance be found?

A

Aircraft Maintenance Manual

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8
Q

In flight, the forward motion of the aircraft produces an increase in intake pressure known as the

A

Ram

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9
Q

Which is a possible subsystem of a naturally aspirated induction system?

A

alternate air source

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10
Q

Which air filter system can be washed?

A

Flocked Screen

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11
Q

Manifold air pressure is measured between the

A

Throttle plate and intake valve

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12
Q

The fuel/air mixture is passed through the engine oil sump to

A

Warm the induction air

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13
Q

When will small induction system air leaks have the most noticable effect?

A

At low RPM

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14
Q

Carburetor icing is most severe at

A

at temperatures between 30 and 40 F

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15
Q

Into what part of a reciprocating engine induction system is deicing alcohol normally injected?

A

The airstream ahead of the carburetor.

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16
Q

Carburetor icing on an engine equipped with a constant-speed propeller can be detected by

A

constant RPM with a decrease in manifold pressure.

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17
Q

What part of an aircraft in flight will begin to accumulate ice before any other?

A

Carburetor

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18
Q

Where would a carburetor air heater be located in a fuel injection system?

A

Fuel injection systems use alternate air instead of carburetor heat.

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19
Q

An increase in manifold pressure when carburetor heat is applied indicates

A

ice was forming in the carburetor

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20
Q

During full power output of an unsupercharged engine equipped with a float-type carburetor, in which of the following areas will the highest presssure exist?

A

Carburetor air scoop

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21
Q

The use of the carburetor air heater when it is not needed causes

A

a decrease in power and possibly detonation.

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22
Q

As manifold pressure increases in a reciprocating engine, the

A

density of air in the cylinder increases.

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23
Q

In an airplane equipped with an alternate air system, if the main air duct filter becomes blocked or clogged, the

A

system will automatically allow warm, unfiltered air to be drawn into the engine.

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24
Q

The action of a carburetor air scoop is to supply air to the carburetor, but it may also

A

increase the pressure of the incoming air by ram effect.

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25
Q

One source commonly used for carburetor air heat is

A

A muffler shroud or heat muff

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26
Q

To what altitude will a turbo-charged engine maintain sea level pressure?

A

Critical Altitude

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27
Q

Bootstrapping of a turbocharged engine is indicated by

A

a transient increase in engine power

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28
Q

If the turbocharger waste gate is completely closed,

A

all the exhaust gases are directed through the turbine

29
Q

Boost manifold pressure is generally considered to be any manifold pressure above

A

30 inches of Mercury

30
Q

What is the purpose of the density controller in a turbocharger system?

A

Limits the maximum manifold pressure that can be produced by the turbocharger at full throttle.

31
Q

What is the purpose of a turbocharger system for a small reciprocating aircraft engine?

A

Compresses air to maintain manifold pressure constant from sea level to the critical altitude of the engine.

32
Q

The differential pressure controller in a turbocharger system

A

reduces bootstrapping during part-throttle operation.

33
Q

The purpose of a sonic venturi on a turbocharged engine is to

A

limit the amount of air that can flow from the turbocharger into t he cabin for pressurization.

34
Q

How is a supercharger driven?

A

Mechanically off of the crankshaft.

35
Q

The purpose of an intercooler when used with a turbocharger is to cool the

A

air entering the carburetor from the turbocharger.

36
Q

Superchargers which are powered by exhaust gasses are called

A

Turbochargers

37
Q

The valve that is used to control the amount of exhaust gases routed to the turbocharger is a

A

waste gate

38
Q

What is the air called in “A” between the compressor and the throttle plate?

A

Upper Deck Air

39
Q

What is the air in “B”, between the throttle plate and the intake valve, called?

A

Manifold Air

40
Q

On an aircraft with a two-speed supercharger, which speed will the aircraft use for take-off?

A

Low

41
Q

Which turbocharger component provides motive power to the rotor?

A

Turbine

42
Q

Which turbocharger component compresses the air?

A

Impeller

43
Q

Oil in a turbine rotor bearing housing provides what important functions?

A

Lubricating and cooling

44
Q

What provides the force to operate the waste gate?

A

Spring and engine oil pressure

45
Q

What releases upper deck pressure if all other turbo controllers fail?

A

Pressure relief valve

46
Q

Which controller prevents upper deck pressure from rising too rapidly?

A

Rate-of-change

47
Q

Which controller operates ONLY at full throttle?

A

Density

48
Q

Turbo systems which boost only to 30”Hg are called:

A

Sea-level boosted

49
Q

The wastegate is moved open by:

A

Spring Pressure

50
Q

If the wastegate looses oil pressure, it will move to which position?

A

Open

51
Q

Anti-icing of jet engine air inlets is commonly accomplished by

A

engine bleed air ducted through the critical areas.

52
Q

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

A

noticeable shift in EPR

53
Q

The purpose of a bellmouth compressor inlet is to

A

maximize the aerodynamic efficiency of the inlet

54
Q

What method(s) is/are used to provide clean air to the engines of helicopters and turboprop airplanes that have particle (sand and ice) separators installed?

A

Sharp airflow directional change to take advantage of inertia and/or centrifugal force, and filters or engine inlet screens.

55
Q

In a divergent duct air velocity _____ and air pressure increases.

A

decreases

56
Q

In flight, the forward motion of the aircraft produces an increase in intake pressure known as the

A

ram effect

57
Q

The inlet for a turbofan engine is similiar in design to that for a turboprop except that it discharges only a portion of its air into the engine, the remainder passes through the

A

fan

58
Q

The inlet duct on a subsonic turbojet powered aircraft is ______

A

Diverging

59
Q

When turbine engines are calibrated on a test stand, a _____ inlet is typically installed.

A

bellmouth

60
Q

What material is commonly used to reduce noise emissions in a turbine engine’s intake duct?

A

Acoustic shielding

61
Q

Abrasion strips inside a turbine engine inlet duct:

A

Increase aerodynamic efficiency of the compressor blades.

62
Q

Screens are typically placed on APU inlets to

A

Prevent FOD ingestion

63
Q

When performing maintenance inside turbine inlets, which of the following is not recommended:

A

Place as many loose objects in your pockets as you can.

64
Q

Which of the following discharges fan bypass air directly behind the fan?

A

Unducted fan

65
Q

What advantage(s) do modern titanium blades used in turbine engine fans have over older steel blades?

A

Lighter weight and increased resistance to FOD.

66
Q

Increase altitude will ___ the air pressure?

A

Decrease

A&P Powerplant (1 decks)

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