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WorksheetsParting quizz
Total questions: 17
Worksheet time: 51mins
Which components is driven by a turbine that is rotated by the exhaust gases and compress the air?
Turbochargers
Supercharger
Wastegate
Aneroid Capsule
An Automatic Boost Control Unit:
prevents detonation and dissociation in the cylinder
maintains an automatic preset boost pressure
maintains the correct mixture strength for the boost pressure set
sets the position of the wastegate to ensure the preset boost is maintained
Rated Altitude is:
height at which the boost pressure ceases to be effective with a specific rpm set
comparison between the boost pressure at sea level and that at a given altitude
maximum altitude at which Rated Boost can be maintained with Rated rpm set
altitude at which the wastegate becomes fully shut
The turbocharger wastegate is spring loaded towards:
the open position
the closed position
A neutrally balanced partly open position
the maximum boost position
The main function of a supercharger is to:
increase the thermal efficiency of the engine
increase the compression ratio of the engine
maintain sea level pressure in the engine to above rated altitude
increase the volumetric efficiency of the engine
With a constant manifold pressure set during the climb, the power output from an internally supercharged engine:
decreases
increases
remains constant
is unaffected by altitude change
The blade angle of a propeller is the angle between:
the root chord and the tip chord of the propeller
the chord and the airflow relative to the propeller
the chord of the propeller and the longitudinal axis of the aircraf
the propeller chord and the plane of rotation of the propeller
The geometric pitch of a propeller is:
the distance it would move forward in one revolution at the blade angle
the angle the propeller chord makes to the plane of rotation
the distance the propeller actually moves forward in one revolution
the angle the propeller chord makes to the relative airflow
The Beta range of a propeller is from:
the feather stops to the flight fine pitch stop
the feather stops to the ground fine pitch stop
the feather stops to the reverse pitch stop
the flight fine pitch stop to the reverse pitch stop
In a turbofan engine, the fan speed is controlled by:
a reduction gear
a wastegate
the turbine
varying the pitch
The purpose of an air inlet is to provide a relatively ............. supply of air to the ............. of the ............ compressor.
turbulent free, face, low pressure
turbulent, face, low pressure
turbulent free, rear, low pressure
turbulent free, face, high pressure
The occurrence of compressor stalls is limited by:
bleed valves
nozzle guide vanes
swirl vanes
cascade vanes
One advantage of an annular combustion chamber system is that:
the diameter of the engine is reduced
there is unrestricted airflow at maximum rpm
there are no flame propagation problems
the air casing area is greater
Swirl vanes in the combustion chamber:
increase the velocity of the airflow
reduce the velocity of the airflow
prevent compressor stall
help to stabilize combustion
the effect on the temperature and pressure of the gases as they pass across the turbine is:
their temperature decreases and their pressure rises.
both their temperature and pressure increase.
both their temperature and pressure decrease.
their temperature increases and their pressure falls.
The impulse-reaction blade is twisted along its length so that:
there is a greater angle at the base than at the tip.
the gas flow is accelerated through the turbine.
the gas does equal work along the whole of its length.
the gas flow is decelerated through the nozzle guide vanes.
A choked nozzle:
decreases thrust
gives additional pressure without the addition of heat
has no effect on thrust
implies that no further increase in velocity can be obtained without the increase of heat
