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Powerplant Writtens > Induction and Engine Airflow Systems > Flashcards

Induction and Engine Airflow Systems Flashcards

1
Q

A method commonly used to prevent carburetor icing is to what?

A

preheat the intake air.

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2
Q

Carburetor icing is most severe at what?

A

air temperatures between 30 and 40 degrees F

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3
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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4
Q

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

A

a decrease in manifold pressure with a constant RPM.

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5
Q

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

A

Carburetor

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6
Q

Carburetor icing may be eliminated by which of the following methods?

A

Alcohol spray and heated induction air.

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7
Q

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

A

None is required.

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8
Q

An increase in manifold pressure when carburetor heat is applied indicates what?

A

ice was forming in the carburetor.

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9
Q

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

A

Carburetor air scoop.

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10
Q

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

A

a decrease in power and possibly detonation.

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11
Q

As manifold pressure increases in a reciprocating engine, the…

A

density of the air in the cylinder increases.

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12
Q

Which of the following statements regarding volumetric efficiency of an engine is true?

A

It is possible to exceed 100 percent volumetric efficiency of some engines by the use of superchargers of the proper type.

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13
Q

Bootstrapping of a turbocharged engine is indicated by what?

A

A transient increase in engine power.

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14
Q

Which of the following would be a factor in the failure of an engine to develop full power at takeoff?

A

Improper adjustment of carburetor heat valve control linkage.

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15
Q

If the turbocharger waste gate is completely closed, …

A

all the exhaust gases are directed through the turbine.

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16
Q

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

A

30 “Hg

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17
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.

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18
Q

What is the purpose of the rate-of-charge controller in a turbocharger system?

A

Controls the rate at which the turbocharger discharge pressure will increase.

19
Q

What directly regulates the speed of a turbocharger?

A

Waste gate.

20
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.

21
Q

What are the three basic regulating components of a sea-level boosted turbocharger system?

A

Exhaust bypass assembly, density controller, and differential pressure controller.

22
Q

The differential pressure controller in a turbocharger system…

A

reduces bootstrapping during part-throttle operation.

23
Q

The pressure between the turbocharger and the throttle valve is called what?

A

upper deck pressure.

24
Q

Which of the following is a function of the differential pressure controller?

A

It controls all positions of the waste gate except at fully open position.

25
Q

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

A

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

26
Q

What is used to drive a supercharger?

A

Gear train from the crankshaft.

27
Q

The purpose of a bellmouth compressor inlet is to what?

A

maximize the aerodynamic efficiency of the inlet.

28
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.

29
Q

The vortex dissipators installed on some turbine powered aircraft to prevent engine FOD utilize what?

A

a stream of engine bleed air blown toward the ground ahead of the engine.

30
Q

Vortex dissipator systems are generally activated by what?

A

a landing gear switch.

31
Q

When an engine with a subsonic divergent type inlet duct is running in place at high speed on the ground, the air pressure within the inlet is what?

A

positive.

32
Q

What engine instrument indications shift when a turbofan engine anti-icing (bleed air) system is turned on?

A

tachometer, EGT, and EPR

33
Q

The purpose of an engine/inlet anti-ice system is primarily to what?

A

prevent ice formation in engine and/or inlet areas.

34
Q

If carburetor or induction system icing is not present when carburetor heat is applied with no change in the throttle setting, the what?

A

mixture will become richer.

35
Q

When starting an engine equipped with a carburetor air heater, in what position should the heater be placed?

A

COLD.

36
Q

The application of carburetor heat during engine operation will what?

A

decrease the weight of the fuel/air charge.

37
Q

The application of carburetor heat will have which of the following effects?

A

The mixture will become richer.

38
Q

When operating an engine, the application of carburetor heat will have what effect on the fuel/air mixture?

A

Enriching the mixture until the AMC can make a compensation.

39
Q

In addition to causing accelerated wear, dust or sand ingested by a reciprocating engine may also cause what?

A

silicon fouling of spark plugs.

40
Q

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

A

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

41
Q

If a fire starts in the induction system during the engine starting procedure, what should the operator do?

A

Continue cranking the engine.

42
Q

On a small aircraft engines, fuel vaporization may be increased by what?

A

circulating the fuel and air mixture through passages in the oil sump.

43
Q

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

A

increase the pressure of the incoming air by ram effect.

44
Q

A carburetor air pre-heater is not generally used on takeoff unless absolutely necessary because of the what?

A

loses of power and possible detonation.

Powerplant Writtens (28 decks)

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