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Aircraft General Knowledge > Piston Engines > Flashcards

Piston Engines Flashcards

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1
Q

How do you measure power using rpm?

A

Power = RPM X torque

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2
Q

How do you measure torque?

A

Torque = force x distance

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3
Q

How is torque proportional to engine speed?

A

Torque is proportional to 1/speed

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4
Q

How does chemical energy become mechanical energy in a piston engine?

A

Chemical - heat - pressure - mechanical

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5
Q

What is the charge flow?

A

Air + fuel

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6
Q

What does it mean if a movement is reciprocal?

A

Up and down.

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7
Q

Whats the difference between a constant volume engine and a reciprocal engine?

A

They’re the same thing.

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8
Q

Whats the distance between the top dead centre and the bottom dead centre called?

A

Stroke.

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9
Q

How many degrees of rotation occur when the piston moves between the bottom dead centre and the top dead centre?

A

180 degrees.

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10
Q

How many strokes does an OTTO cycle have?

A

4.

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11
Q

What are the different strokes in the otto cycle?

A

Ignition - compression - power - exhaust.

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12
Q

What happens between a compression stroke and a power stroke in an otto cycle?

A

Ignition.

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13
Q

Which strokes in the otto cycle will you see the inlet and exhaust valves closed?

A

Compression and power stroke.

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14
Q

At the ineffective crank angle, how would you describe the linear movement of the piston?

A

Small.

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15
Q

What is the defintion for when the inlet valve is still open as the compression stroke begins in a piston engine cylinder?

A

Inlet valve lag.

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16
Q

What happens to the inlet and exhaust valve positions when there is an inlet valve lead in a piston engine aircraft?

A

The inlet valve and exhaust valve are both open.

17
Q

A car that has 6000 revolutions per minute has how many combustions per second?

A

25.

18
Q

At what angle of rotation does peak torque occur?

A

90 degrees.

19
Q

What happens to the pressure and volume when the piston descends?

A

Volume increases causing pressure to decrease.

20
Q

What does stoichiometric mean?

A

Chemically balanced.

21
Q

What is the recommended step to take in case you experience detonation during take-off?

A

Retard the throttle.

22
Q

A waste gate controls the output of a turbocharger by varying the amount of exhaust gasses passing through the turbocharger’s (1) _____. A fully (2) _____ waste gate will achieve the maximum turbocharger RPM. (Turbine/compressor) (open/closed)

A

Turbine closed

23
Q

The ignition system of a running piston engine receives electrical energy from…

A

Magnets

24
Q

What could be said about exhaust back pressure when using a supercharged (but not turbocharged) engine?

Exhaust back pressure decreases/increases with altitude and increases engine power slightly.

A

Decreases

25
Q

Consider a fuel injection system. Which is the central point from where fuel is distributed to the individual cylinders? Blank valve.

A

Manifold

26
Q

Which of these can be controlled by the FADEC system on a piston engine? Improve blank timing when RPM varies.

A

Ignition

27
Q

The part of a piston engine that transforms reciprocating movement into rotary motion is called the…

A

Crankshaft

28
Q

The thermal efficiency of a piston engine is about…

A

30%

29
Q

In a piston engine, applying carburettor heat decreases the (1) _____ of air entering the engine, thereby making the mixture (2) _____. Density/pressure. Leaner/richer

A

Density richer

30
Q

Which of the following factors contribute to the process of combustion within a piston engine?

(Pressure/temperature/viscosity)

A

Pressure

31
Q

Which of the following is the safest way to prime a piston engine for start-up? Injecting fuel straight into the

A

Inlet valves

32
Q

To maintain a constant mixture in a piston engine at low and high power settings, a carburettor is fitted with…

A

Diffuser

33
Q

When applying precautionary carburettor heating on a reciprocating engine with a fixed pitch propeller mixture becomes leaner/richer

A

Richer

34
Q

Why do we use cowl flaps?

A

Increase cooling

35
Q

True or false : Ice accretion affects both fuel injection systems and engines equipped with carburettors.

A

True

36
Q

The dry sump oil system for a piston engine incorporates an oil tank with normally two stack pipes installed. Stack pipes can be found… (top+bottom/both top/both bottom)

A

Bottom

Aircraft General Knowledge (49 decks)

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