Reciprocating Engine Induction and Cooling

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

Answer Choices

The manifold pressure will be increased.

The mixture will become leaner.

The mixture will become richer.

The mixture will become richer.

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

Answers

Improper adjustment of carburetor heat valve control linkage.

Excessively rich setting on the idle mixture adjustment.

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

Improper adjustment of carburetor heat valve control linkage.

Question 6 of 75

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

Answers

mixture will become richer.

manifold pressure will increase.

engine RPM will increase.

mixture will become richer.

The primary purpose of baffles and deflectors installed around cylinders of air-cooled aircraft engines is to

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create a low pressure area aft of the cylinders.

force cooling air into close contact with all parts of the cylinders.

increase the volume of air used to cool the engine.

force cooling air into close contact with all parts of the cylinders.

Bootstrapping of a turbocharged engine is indicated by

Answer Choices

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.

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

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HOT.

COLD.

NEUTRAL.

COLD

The differential pressure controller in a turbocharger system

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reduces bootstrapping during part-throttle operation.

positions the waste gate 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

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turbocharger boost pressure.

induction manifold pressure.

upper deck pressure.

upper deck pressure.

How do cowl flaps aid in cooling a horizontally opposed aircraft engine?

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Recirculates air through the engine cylinders.

Directs air through the engine cylinders.

Controls the amount of air flowing around the cylinders.

Controls the amount of air flowing around the cylinders.

Which of the following results in a decrease in volumetric efficiency?

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Cylinder head temperature too low.

Part-throttle operation.

Short intake pipes of large diameter.

Part-throttle operation.

Where are cooling fins usually located on air-cooled engines?

Answer Choices

Exhaust side of the cylinder head, inside the pistons, and connecting rods.

Cylinder head, cylinder walls, and inside the piston.

Cylinder head, cylinder barrel, and inside the piston.

Cylinder head, cylinder barrel, and inside the piston.

Bootstrapping of a turbocharged engine is indicated by

Answer Choices

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.

Which of the following defects would likely cause a hot spot on a reciprocating engine cylinder?

Answer Choices

Too much cooling fin area broken off.

A cracked cylinder baffle.

Cowling air seal leakage.

Too much cooling fin area broken off.

A broken cooling fin on a cylinder head

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is cause for rejection of the head.

may be filed to smooth contours if damage and/or repair limits are not exceeded.

should be left alone.

may be filed to smooth contours if damage and/or repair limits are not exceeded.

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

Answer Choices

A means of cooling the engine by utilizing the propeller backwash.

A tube used to load a cartridge starter.

A device to cool an engine accessory.

A device to cool an engine accessory.

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

Answer Choices

loss of power and possible detonation.

possibility of induction system overboost.

inability of the engine to supply enough heat to make a significant difference.

Explanation

loss of power and possible detonation.

The application of carburetor heat during engine operation will

Answer Choices

decrease the weight of the fuel/ air charge.

decrease the volume of air in the cylinder.

increase the density of air in the cylinder.

decrease the weight of the fuel/ air charge.

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

Answer Choices

a very lean mixture.

excessive increase in manifold pressure.

a decrease in power and possibly detonation.

a decrease in power and possibly detonation.

When a fireguard is standing by during an engine start, they should be watching for potential fires that could start

Answer Choices

close to the battery compartment or starter.

in the induction system or the exhaust system.

at the ground power receptacle (if connected to a ground power unit).

in the induction system or the exhaust system.

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

Answer Choices

The supercharger or impeller section.

The airstream ahead of the carburetor.

The low-pressure area ahead of the throttle valve.

The airstream ahead of the carburetor.

The undersides of pistons are frequently finned. The principal reason is to

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provide sludge chambers and sediment traps.

provide for greater heat transfer to the engine oil.

support ring grooves and piston pins.

provide for greater heat transfer to the engine oil

On small aircraft engines, fuel vaporization may be increased by

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cooling the air before it enters the engine.

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

heating the fuel before it enters the carburetor.

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

Which of the following assists in removing heat from the metal walls and fins of an air-cooled cylinder assembly?

Answer Choices

An intercooler system.

A baffle and cowl arrangement.

An engine induction system.

A baffle and cowl arrangement.

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

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cool the engine.

keep fuel lines cool and prevent vapor lock.

increase the pressure of the incoming air by ram effect.

increase the pressure of the incoming air by ram effect.

One source commonly used for carburetor air heat is

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turbocharger heated air.

alternate air heat.

exhaust gases.

exhaust gases.

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

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

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

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.

High cylinder head temperatures are likely to result from

Answer Choices

a very lean mixture at high power settings.

fouled spark plugs.

a very rich mixture at high power settings.

a very lean mixture at high power settings.

What is the purpose of an augmenter used in some reciprocating engine exhaust systems?

Answer Choices

To reduce exhaust back pressure.

To aid in cooling the engine.

To assist in displacing the exhaust gases.

To aid in cooling the engine.

The greatest portion of heat generated by combustion in a typical aircraft reciprocating engine is

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converted into useful power.

carried out with the exhaust gases.

dissipated through the cylinder walls and heads.

carried out with the exhaust gases.

If the turbocharger waste gate is completely closed,

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none of the exhaust gases are directed through the turbine.

the turbocharger is in the OFF position.

all the exhaust gases are directed through the turbine.

all the exhaust gases are directed through the turbine.

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

Answer Choices

a decrease in power output with no change in manifold pressure or RPM.

an increase in manifold pressure with a constant RPM.

a decrease in manifold pressure with a constant RPM.

a decrease in manifold pressure with a constant RPM.

A bent cooling fin on an aluminum cylinder head should be

Answer Choices

sawed off and filed smooth.

left alone if no crack has formed.

straightened out as much as possible without breaking.

left alone if no crack has formed.

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

Answer Choices

Wing leading edge.

Propeller spinner or dome.

Carburetor.

Carburetor

What is the position of the cowl flaps during engine starting and warmup operations under normal conditions?

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Full open at all times.

Full closed at all times.

Open for starting, closed for warmup.

Full open at all times.

What directly regulates the speed of a turbocharger?

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Turbine.

Waste gate.

Throttle

Waste gate.

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?

Answer Choices

Venturi.

Intake manifold.

Carburetor air scoop.

Carburetor air scoop.

On small aircraft engines, fuel vaporization may be increased by

Answer Choices

cooling the air before it enters the engine.

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

heating the fuel before it enters the carburetor.

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

Which of the following assists in removing heat from the metal walls and fins of an air-cooled cylinder assembly?

Answer Choices

An intercooler system.

A baffle and cowl arrangement.

An engine induction system.

A baffle and cowl arrangement.

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

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silicon fouling of spark plugs.

sludge formation.

acid formation.

silicon fouling of spark plugs.

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

Answer Choices

Exhaust bypass assembly, compressor assembly, and density controller.

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

Pump and bearing casing, compressor assembly, and density controller.

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

As manifold pressure increases in a reciprocating engine, the

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volume of air in the cylinder increases.

weight of the fuel/air charge decreases.

density of air in the cylinder increases.

density of air in the cylinder increases.