CSYH Practice Cards 4

Question 1

The pressure exerted on the piston during the power stroke increases as the mass of charge induced …

Answer 1

increases and combustion temperature increases

Question 2

As the throttle is moved towards the fully open position …

Answer 2

manifold pressure increases and mass flow increases

Question 3

The volumetric efficiency of an engine depends on …

Answer 3

throttle position,
Ambient Temperature,
Ambient Pressure
RPM

Question 4

The best action to take at the onset of detonation in an engine is …

Answer 4

select mixture fully rich and decrease the power

Question 5

The onset of detonation in an engine is indicated by …

Answer 5

vibration,
Rising temperatures and
Reduced indicated air speed

Question 6

One of the limitations applying to increased RPM for increased power in a piston engine is …

Answer 6

excessive rotor tip speed

Question 7

The warm up period for an engine prior to take off provides …

Answer 7

proper oil viscosity and uniform heating of engine components

Question 8

If the engine is over heating during a long climb, an appropriate pilot action would be …

Answer 8

increase indicated airspeed, richen the mixture and if necessary, reduce power

Helicopters fly full rich at all times but this is a generic piston engine question.

Question 9

If cylinder head temperatures are becoming too low during a long descent, the pilot should …

Answer 9

reduce indicated air speed and increase power

Question 10

The octane rating of a fuel is a measure of …

Answer 10

it’s resistance to detonation

Question 11

A horizontally opposed engine should be held at about 1000 RPM after a cold start rather than idle to avoid …

Answer 11

excessive cylinder wear due to poor lubrication at RPM

Question 12

A radial engine always has an uneven number of cylinders, commonly 5, 7 or 11. This is a necessary design feature to ensure …

Answer 12

uniformly spaced power strokes during the cycle

Question 13

The function of oil in an engine is to …

Answer 13

clean,
cool and
lubricate

Question 14

The viscosity of an oil is a measure of

Answer 14

the oil’s resistance to flow

Question 15

The purpose of an oil cooler bypass is …

Answer 15

to prevent oil from passing through the cooler if it is already cold

Question 16

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

Answer 16

oil temperature will rise and oil pressure will fall

Question 17

One cause of high oil temperature and low oil pressure could be …

Answer 17

very low oil level in the sump

Question 18

The purpose of gearing a propeller (rotor) in an aircraft engine is to permit the propeller (rotor) to turn at …

Answer 18

lower RPM and higher torque than the engine

Question 19

Operating an engine with too low and oil quantity will produce …

Answer 19

rising oil temperature and dropping oil pressure

Question 20

During a long climb, the cylinder head temperature becomes too high. This can be rectified by …

Answer 20

richening the mixture to full rich and increasing the climbing indicated air speed

Question 21

With the majority of opposed engines, the left -hand magneto …

Answer 21

fires the right top and left bottom plugs

Question 22

In a constant speed engine, the onset of fuel vapor locking would be indicated by …

Answer 22

fluctuating oil pressure

Question 23

If fuel vaporisation occurs during flight, the appropriate pilot action would be …

Answer 23

operate the fuel boost pump

Question 24

If the take-off manifold pressure exceeds rated boost in a turbo-charged engine …

Answer 24

detonation and engine damage could result

Question 25

In a hydraulic system using a constant displacement pump, system pressure is controlled by …

Answer 25

the pressure regulator

Question 26

The main hydraulic power pump in a helicopter hydraulic system is powered by …

Answer 26

mechanical drive from the main rotor transmission

Question 27

If a left-hand-zero ammeter indicate zero during flight …

Answer 27

the alternator has failed

Question 28

A non return valve (check valve) is fitted to a hydraulic circuit to …

Answer 28

ensure fluid only flows in one direction

Question 29

The purpose of the cooler in an aircraft hydraulic system is to …

Answer 29

cool the fluid as it returns from the pressure regulator to the reservoir

Question 30

A reservoir may be pressurised to provide …

Answer 30

positive fluid supply and reduced foaming

Question 31

Hydraulic fluid requires …

Answer 31

lubricating properties

Question 32

A turbo charger with an exhaust leak upstream of the waste gate causes …

Answer 32

decreased power output

Question 33

The effect of a blocked pitot tube during a climb would be …

Answer 33

an increasing nose pitch up attitude required to maintain climb indicated airspeed

Question 34

To find the firing interval of a 4-stroke engine …

Answer 34

divide 720 by the number of cylinders

Question 35

A hazard associated with nickel/cadmium (NICAD) batteries in an aircraft is …

Answer 35

thermal runway

Question 36

A circuit breaker in an aircraft electrical system is provided to …

Answer 36

protect a circuit against overload conditions

Question 37

An airspeed indicator (ASI) will show true airspeed (TAS) in …

Answer 37

ISA conditions at mean sea level

Question 38

At 6000 ft the pitot becomes blocked, but the static vent is still clear. On descent the VSI will show …

Answer 38

the correct RDO

Question 39

With a fully articulated rotor head and wheeled undercarriage with unequal tyre pressures, a possible hazard is …

Answer 39

ground resonance

Question 40

The presence of carburettor icing may be verified by maintaining constant throttle and collective pitch settings, then applying carburettor heat and noting an immediate …

Answer 40

decrease in MP, then a gradual increase