What is the purpose of a Test Club Propeller (TCP) in engine testing?

To provide load and cooling airflow during engine test runs

To reduce engine friction during idling

To measure fuel pressure entering the carburetor

For actual flight to increase aircraft lift

What is Indicated Horsepower (IHP)?

The horsepower calculated from the indicated mean effective pressure in the cylinder, without reference to friction losses

The horsepower lost to auxiliary devices such as fuel and oil pumps

The horsepower measured directly at the crankshaft

The actual power delivered to the propeller after friction losses

What is Brake Horsepower (bhp)?

The actual horsepower delivered to the propeller for useful work after subtracting friction losses

The power required to start the engine

The theoretical power of an engine without considering friction losses

The power lost in overcoming mechanical friction inside the engine

What are the advantages of the Rich Mixture?

Safeguard against engine damage

What is the primary function of the connecting rod in a piston engine?

To carry the forces from the piston to the crankshaft

To reduce friction between crankshaft and bearings

To open and close the intake valves

To act as the combustion chamber

Which of the following statements about the crankshaft in piston engines is correct?

The crankshaft converts reciprocating motion of the piston into rotary motion to drive the propeller.

The crankshaft supports the piston directly without the connecting rod.

The crankshaft only rotates the camshaft and does not transmit piston forces.

The crankshaft is only used in radial engines and not in in -line or opposed engines.

Why is the cylinder head of an air -cooled piston engine usually made of alum inium alloy?

To conduct heat efficiently and reduce weight

To withstand high combustion pressure

To ease the assembly with the cylinder barrel

How are the cylinders of a single -row radial engine numbered?

Starting at the bottom right, clockwise

Starting at the bottom left, counter -clockwise

Starting at the top, counter -clockwise

Why do valve need two helical coil spring to operate?

To damp out all the spring surge vibration during engine operation

To reduce the possibility of fa ilure by breakage from heat and metal fatique

What is the advantages of sleeve valve?

It have high volumetric efficiency

Why valve that have liquid sodium in the stem should not be cut open?

It may contaminate other component

The part may be loose in the engine

Where is a double throw crankshaft arrangement typically found?

In a two -row radial engine, one throw for each row of cylinders

In an i n-line six -cylinder engine

In a single -cylinder in -line engine

What is th e main purpose of a dynamic damper fitted to a crankshaft?

To absorb and balance out vibration forces from power impulses

To provide additional lubrication to journals

To attach the prop eller to the crankshaft

To increase the crankshaft’s overall strength

Which method is used to reduce vibration in single -throw crankshafts for radial engines?

Using counterweights or dynamic balancing

Increasing the thickness of the journals

What is the main function of crankshaft journa ls?

To support the crankshaft within the main bearings

To attach connecting rods to the crankshaft

To balance vibrations during rotation

To reduce engine noise during operation

What is the purpose of carburetor ?

Meter into this air the correct amount of atomised liquid gasoline.

Maintain a constant proportion of fuel and air.

Measure the amount of air entering the engine.

What is the chief disadvantage of the float -type carburetor?

Incomplete vaporisation due to low fuel pressure

Difficulty in use with supercharged systems

Its response to abrupt manoeuvres

Why is a separate idling system necessary in a carburetor?

Because the main discharge nozzle cannot supply fuel when the throttle is closed

Because the float chamber is empty at low RPM

Because the Venturi does not create any airflow at idle

Because the throttle valve cannot control airflow at idle

What is the primary reason engine power decreases when carburetor heat is applied?

Warm air has lower density, re ducing the mass of air available for combustion

The fuel -to-air ratio automatically corrects itself, reducing efficiency

The carburetor flap partially closes, restricting airflow

The exhaust manifold absorbs some of the combustion gases

How is the air metering force created in the throttle body?

By the pressure differentia l between chamber A and chamber B

By the action of the throttle stop

By the flow of unmetered fuel through the regulator

By the movement of the idle valve

What is the function of Chamber C in the regulator?

Contains unmetered fuel pressure

At idle , how does the flow divider distribute fuel?

The valve opens slightly, exposing the V -slot for equal distribution

Fuel pressure is negligible, so no fuel reaches the nozzles

The fl ow divider bypasses fuel directly to the fuel pump

The valve is fully open, allowing unrestricted flow

What is the purpose of the enrichment jet installed in parallel with the main metering jet?

To increase fuel/air mixture strength for engine cooling at high power

To balance fuel flow among cylinders

What is one of the unique features of the fuel injector pump assembly?

It removes vapours from fuel and vents them back to the fuel tank

It bypasses fuel directly to the cylinders at idle

It eliminates the need for a fuel control unit

It prevents air metering force from fluctuating

What is the main advantage of the extremely high p ressure in a common -rail system?

It assures better vaporisation and cleaner combustion

It reduces the need for a fuel pump

It eliminates the need for FADEC

It allows the engine to run without injectors

What does FADEC stand for?

Full Authority Digital Electronic control.

Full Automatic Dual Engine Controller.

Finalized Analog Engine Control.

Fundamental Authority Digital Electronic Computer.

What to do if both sensors malfunction in dually redundant?

Use synthetic software default values.

Is switch to using a sensor from a non -redundant system.

What is the difference between an EEC and FADEC?

EEC allows manual override, but FADEC does not

FADEC allows manual override, but EEC does not

Which of the following is listed as an advantage of FADEC?

Provides better fuel efficiency

Requires constant pilot mixture adjustment

Operates without any electrical power

If the aircraft’s primary electrical system fails, how long can the FADEC battery supply the EEC?

Only when alternator is running

Engine Mechanics Quiz

Authored by Guitar (TheLifeIsHard)

Physics

University

Used 1+ times

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122 questions

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MULTIPLE CHOICE QUESTION

30 mins • 1 pt

Which stroke piston going down?

Exhaust stroke

Intake stroke

Compression stroke

Power

MULTIPLE CHOICE QUESTION

30 mins • 1 pt

What connect piston and crankshaft ?

Cylinder sleeve

Connecting rod

Crank pin

Piston ring

MULTIPLE CHOICE QUESTION

30 mins • 1 pt

Which is not valve head configuration

J-head

T-head

I-head

L-head

MULTIPLE CHOICE QUESTION

30 mins • 1 pt

During which stroke of a four -stroke engine is the exhaust valve open?

Intake

Exhaust

Compression

Power

MULTIPLE CHOICE QUESTION

30 mins • 1 pt

During which stroke of a four -stroke engine is both valve closed and piston move from TDC to BDC?

Intake

Exhaust

Power

Compression

MULTIPLE CHOICE QUESTION

30 mins • 1 pt

During which stroke of a four -stroke engine is both valve closed and piston move from BDC to TDC?

Power

Intake

Compression

Exhaust

MULTIPLE CHOICE QUESTION

30 mins • 1 pt

What is the correct Firing order of 4 cylinder inline

4-3-2-1

1-2-4-3

2-1-3-4

3-2-1-4

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Engine Mechanics Quiz

Which stroke piston going down?

What connect piston and crankshaft ?

Which is not valve head configuration

During which stroke of a four -stroke engine is the exhaust valve open?

During which stroke of a four -stroke engine is both valve closed and piston move from TDC to BDC?

During which stroke of a four -stroke engine is both valve closed and piston move from BDC to TDC?

What is the correct Firing order of 4 cylinder inline

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What is the correct Firing order of 4 cylinder opposed engine

What is the correct Firing order of Textron -Lycoming 6 cylinder opposed engine

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