My powerplant 8772-8813

A method commonly used to prevent carburetor icing is to

preheat the intake air.

Carburetor icing is most severe at

air tempurature between 30 and 40 degrees F.

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

The airstream ahead of the carburetor.

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

A decrease in manifold pressure with a constant RPM.

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


Caruretor icing may be eliminated by what method?

Alcohol spray and heated induction air.

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

None is required.

An increase in manifold pressure when carburetor heat is applied indicates

ice was forming in the carburetor.

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?

Carburetor air scoop.

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

a decrease in power and possible detonation.

As manifold pressure increases in a reciprocating engine, the

density of air in the cylinder increases.

What statement regarding volumetric efficiency of an engine is true?

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

Bootstrapping of a turbocharged engine is indicated by

a transient increase in engine power.

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

Improper adjustment of carburetor heat valve control linkage.

If the turbocharger waste gate is completely closed,

all the exhaust gases are directed through the turbine.

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

30 inches Hg.

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

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

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

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

What directly regulates the speed of a turbocharger?

Waste gate.

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

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

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

1)Exhaust bypass assembly, 2) Density controller, 3) Differential pressure controller.

The differential pressure controller in a turbo-charger system

reduces bootstrapping during part-throttle operation.

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

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

What is used to drive a supercharger?

Gear train from the crankshaft.

The purpose of a bellmouth compressor inlet is to

maximize the aerodynamic efficiency of the inlet.

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?

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

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

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

Vortex dissipator systems are generally activates by

a landing gear switch.

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

1) Tachometer, 2) EGT, 3) EPR

The purpose of an engine/inlet anti-cie system is primarily to

prevent ice formation in engine and/or inlet areas.

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

mixture will become richer.

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


The application of carburetor heat during engine operation will

decrease the weight of the fuel/air charge.

The application of carburetor heat will have what effects?

The mixture will become richer.

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

Enriching the mixture until the AMC can make a compensation.

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

silicon fouling of spark plugs.

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

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

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

Continue cranking the engine.

On small aircraft engines, fuel vaporization may be increased by

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

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

increase the pressure of the incoming air by ram effect.

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

loss of power and possible dentonation.