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2. CPLH Aircraft General Knowledge > CSYH Practice Cards 3 > Flashcards

CSYH Practice Cards 3 Flashcards

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1
Q

An engine with a combustion chamber of 13 cubic inches capacity and swept volume of 78 cubic inches, has a compression ratio of …

A

7 to 1

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2
Q

When the inlet valve is closed after BDC in a 4-stroke engine, the maximum quantity of fuel/air charge entering the cylinder is ensured. This modification to the valve timing is know as …

A

valve lag

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3
Q

Friction horsepower is …

A

the difference between the indicated horsepower and the brake horsepower

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4
Q

How many degrees of crankshaft rotation are required to fire all cylinders on an in-line engine using a 4-stroke cycle?

A

720

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5
Q

The position of the valves during the intake stroke of an actual for stroke cycle engine is …

A

exhaust open but starting to close at start of stroke and inlet open throughout

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6
Q

An engine with a combustion chamber of 9 cubic inches capacity and a swept volume of 45 cubic inches has a compression ratio of …

A

6 to 1

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7
Q

The purpose of a scavenge pump in an oil system is to …

A

to remove the oil from the engine and send it to the external oil tank in a dry sump system

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8
Q

With regard to a piston engine helicopter with correlation between collective and throttle …

A

the collective lever is the primary control for manifold pressure and the throttle is the primary control for RPM

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9
Q

Lead acid type batteries need to be located in a vented battery box within an aircraft …

A

to dissipate the flammable gases produced as by products of the chemical reactions occurring with the battery.

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10
Q

The most probable cause of a pronounced low frequency per revolution vibration which is felt as a vertical bounce in forward flight is …

A

the main rotor blades being out of track

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11
Q

On a piston engine with a 4-stroke cycle, each stroke commences …

A

when the piston is at either BDC or TDC

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12
Q

A voltage regulator controls alternator output by …

A

varying the current flow to the alternator field coil

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13
Q

A rapid fluctuating CHT reading would indicate that …

A

the CHT indication system is faulty

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14
Q

An unchanged altimeter reading during climb in an unpressurised aircraft could indicate a …

A

blocked static vent

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15
Q

Aircraft hydraulic systems may incorporate hand operated pumps for the purpose of …

A

providing emergency hydraulic pressure in the event of mechanical pump failure

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16
Q

With a rigid rotor system, the blades do not have complete freedom to …

A

drag or flap, but can feather

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17
Q

Operating an engine with the oil level below the specified minimum is likely to cause…

A

engine overheating

18
Q

During normal advancement of the throttle of a turbo charged engine, the manifold pressure rose excessively. This could have been caused by …

A

the waste gate being jammed shut

19
Q

The purpose of the idle jet in a simple carburettor in a piston powered helicopter is to …

A

ensure a small amount of fuel is delivered to the intake manifold when the throttle is closed during idle operation of the engine

20
Q

One disadvantage of a carburettor is …

A

uneven mixture distribution to cylinders

21
Q

The reading of a manifold pressure gauge on an inoperative engine at 3000 ft AMSL would be approximately (assume ISA)

A

27 inches Hg

22
Q

An actuating jack may be stopped at any position by …

A

placing the selector valve in a neutral position

23
Q

A typical hydraulically powered Bell helicopter Semi Rigid teetering type rotor system uses …

A

2 servo actuators for cyclic and 1 servo actuator for collective

24
Q

When accelerating on a Southerly heading in the Southern Hemisphere, the direct reading magnetic compass will …

A

be unaffected

25
Q

When flying towards a area of low atmospheric pressure without adjusting the altimeter subscale …

A

the altimeter will overread

26
Q

A high frequency buzz is most likely to be coming from …

A

tail rotor being out of track

27
Q

Cyclic feathering in a semi-rigid rotor can be used to …

A

tilt the tip path plane

28
Q

A likely result of mixing AVGAS and AVTUR and using the mixture control in a piston engine is …

A

severe detonation

29
Q

A helicopter’s fuel tank is vented to the outside of the fuselage, but the vent opening should be covered with a small fairing which is missing. In this situation …

A

may cause the tank to collapse by reducing tank pressure

30
Q

The ratio of the power output of an engine to the power developed by the pistons is know as …

A

mechanical efficiency

31
Q

For take-off under very high density altitude conditions …

A

the mixture should be leaned until engine runs smoothly

*this is a common question, not helicopter specific but you may find it on the exam

32
Q

If throttle and mixture levers remained unchanged during a long climb for sea level, power available will decrease because …

A

volumetric efficiency reduces and mixture becomes too rich

33
Q

Shielding, as employed in aircraft electrical systems, is used for …

A

reducing noise in radio receiving and transmitting equipment

34
Q

If airflow to the oil cooler is interrupted by obstruction in the duct …

A

oil temperature will rise, oil pressure will fall

35
Q

Hydraulic fluids are …

A

virtually incompressible

36
Q

Pressure altimeters measure the difference between the pressure indicated on the sub-scale and the …

A

static pressure

37
Q

During the compression and power strokes of a theoretical 4-stroke cycle, on a horizontally opposed engine …

A

both valves remain closed

38
Q

As mixture is progressively leaned from full rich condition to engine misfire the engine will achieve …

A

best power,
best economy, then
peak EGT

39
Q

The magneto ground wire is connected to …

A

the magneto switch

40
Q

A piston engined aircraft ignition system using magnetos to fire the spark plugs …

A

may be live if the ground wire is broken

2. CPLH Aircraft General Knowledge (5 decks)

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