ENGINE CARBURATION

If the turbocharger waste gate is completely closed

• None of the exhaust gases are directed through the turbine

• All the exhaust gases are directed through the turbine

• The turbocharger is in the OFF position

All the exhaust gases are directed through the turbine

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

• Loss of power and possible detonation

• Inability of the engine to supply enough heat t make a significant difference

• Possibility of induction system overboat

Loss of power and possible detonation

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

1. Tachometer

2. EGT

3. EPR

• 1 and 3

• 1,2 and 3

• 1 and 2

1,2 and 3

An increase in manifold pressure when carburetor heat is applied indicates

• Ice was forming in the carburetor

• Overheating of cylinder heads

• Mixture was too lean

Ice was forming in the carburetor

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

• Cool the engine

• Increase the pressure of the incoming air by ram effect

• Keep fuel lines cool and prevent vapor lock

Increase the pressure of the incoming air by ram effect

What is used to drive a supercharge

• Exhaust gases

• Belt drive through a pulley arrangement

• Gear train form the crankshaft

Gear train form the crankshaft

On small aircraft engines, fuel vaporization may be increased by

• Heating the fuel before it enters the carburetor

• Cooling the air before it enters the engine

• Circulating the fuel and air mixture through passages in the oil sump

Circulating the fuel and air mixture through passages in the oil sump

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

• Enriching the mixture because the AMC cannot make a correction for increased temperature

• Leaning the mixture until the AMC can make a compensation

• Enriching the mixture until the AMC can make a compensation

Enriching the mixture until the AMC can make a compensation

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

• Wing leading edge

• Carburetor

• Propeller spinner or dome

Carburetor

Bootstrapping of a turbocharged engine is indicated by

• An overboost condition of the engine on takeoff

• A transient increase in engine power

• A maximum increase in manifold pressure

A transient increase in engine power

A method commonly used to prevent carburetor icing to

• Electrically heat the throttle valve

• Preheat the intake air

• Mix alcohol with the fuel

Preheat the intake air

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

• The supercharge or impeller section

• The airstream ahead of the carburetor

• The low pressure area ahead of the throttle valve

The airstream ahead of the carburetor

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

• Between air intake and the venturi

• At the air intake entrance

• None is required

None is required

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

1, Exhaust bypass assembly

2, Compressor assembly

3, Pump of bearing casing

4, Density controller

5, Differential pressure controller

• 2,3,4

• 1,4,5

• 1,2,3

1,4,5

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

• Manifold pressure will increase

• Engine RPM will increase

• Mixture will become richer

Mixture will become richer

Vortex dissipator systems are generally activated by

• A landing gear switch

• An engine inlet airflow sensor

• A fuel pressure switch anytime an engine is operating

A landing gear switch

The application of carburetor heat during engine operation will

• Increase the density of air in the cylinder

• Decrease the weight of the fuel/air change

• Decrease the volume of air in the cylinder

Decrease the weight of the fuel/air change

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, filtered alternate air to be drawn into the engine

• Flow of air into the engine will be slowed or cut off unless alternate air is selected

• System will automatically allow warm, unfiltered air to be drawn into the engine

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

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

• 50 inches Hg

• 30 inches Hg

• 14.7 inches Hg

30 inches Hg

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

• Positive

• Negative

• Ambient

Positive

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

• Maintains constant air velocity at the carburetor inlet

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

• Limits the maximum manifold pressure that can be produced at other than full throttle conditions

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

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

• A decrease in manifold pressure with a constant RPM

• An increase in manifold pressure with a constant RPM

• A decrease in power output with no change in manifold pressure or RPM

A decrease in manifold pressure with a constant RPM

The differential controller in a turbocharger system

• Reduces bootstrapping during part throttle operation

• Positions the wastegate valve for maximum power

• Provides a constant fuel to air ratio

Reduces bootstrapping during part throttle operation

The pressure between the turbocharger and the throttle valve is called

• Upper deck pressure

• Induction manifold pressure

• Turbocharger boost pressure

Upper deck pressure

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

• Excessive increase in manifold pressure

• A very lean mixture

• A decrease in power and possibly detonation

A decrease in power and possibly detonation

What directly regulates the speed of a turbocharger

• Throttle

• Turbine

• Waste gate

Waste gate

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

• Excessive rich setting on the idle mixture adjustment

• Improper adjustment of carburetor heat valve control linkage

• Failure of the economizer valve to remain closed at takeoff throttle setting

Improper adjustment of carburetor heat valve control linkage

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

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

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

• Controls the position of the waste gate after the aircraft has reached its critical altitude

Controls the rate at which the turbocharger discharge pressure will increase

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

• Remove the ice from the engine and/or inlet areas and prevent ice formation in the engine and/or inlet areas

• Remove ice from the engine and/or inlet areas

• Prevent ice formation in the engine and/or inlet areas

Prevent ice formation in the engine and/or inlet areas

As manifold pressure increases in a reciprocating engine, the

• Weight of the fuel/air decreases

• Volume of air in the cylinder increases

• Density of the air in the cylinder increases

Density of the air in the cylinder increases

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?

• Air/moisture separators, and washing the air clean utilizing water droplets

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

• Positive and negative charged areas to attract and/or repair particulates out of the airflow

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

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

• Silicon fouling of spark plugs

• Sludge formation

• Acid Formation

Silicon fouling of spark plugs

Carburetor icing may be eliminated by which of the following method

• Alcohol spray and heated induction air

• Ethylene glycol spray and heated induction air

• Alcohol spray and electrically heated induction duct

Alcohol spray and heated induction air

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

• Limit the amount of air that can flow from the turbocharged into the cabin for pressurization

• Increase the velocity of the fuel/air change

• Increase the amount of air that can flow from the turbocharger into the cabin for pressurization

Limit the amount of air that can flow from the turbocharged into the cabin for pressurization

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

• Turn off the fuel pump switches

• Turn off the magneto switches

• Continue cranking the engine

Continue cranking the engine

Carburetor icing is most severe at

• Low engine temperatures

• Air temperature between 30 and 40 F

• High altitudes

Air temperature between 30 and 40 F

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

• Hot

• Neutral

• Cold

Cold

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

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

• It limits the maximum manifold pressure that can be produced by the turbocharger at full throttle conditions

• it controls the position of the waste gate after the aircraft has reached its critical altitude

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

which of the following statements regarding the volumetric efficiency of an engine is true

• The volumetric efficiency of an engine will remain the same regardless of the amount of throttle opening

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

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

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

• venturi

• intake manifold

• carburetor air scoop

carburetor air scoop

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

• The manifold pressure will be increased

• the mixture will become leaner

• The mixture will become richer

The mixture will become richer

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

• Variable inlet guide vanes (IGV) and/or variable first stage fan blades

• Variable geometry inlet ducts

• A stream of engine bleed air blown toward the ground ahead of the engine

A stream of engine bleed air blown toward the ground ahead of the engine

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

• Compress the air to hold the cabin pressure constant after the aircraft has reached its critical altitude

• Maintains constant air velocity in the intake manifold

• Compress air to maintain manifold pressure constant from sea level to the critical altitude of the engine

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