The thrust of a jet propulsion power unit can be increased by
The velocity of air entering in a rocket is __________ as compared to an aircraft.
With the decrease in compression ratio, the volumetric efficiency
The operation of the reciprocating air motor is similar to reciprocating air compressor.
If the flow of air through the compressor is parallel to its axis, then the compressor is
In a centrifugal compressor, the flow of air is __________ to the axis of compressor.
When the outlet angle from the rotor of a centrifugal compressor is more than 90°, then the blades are said to be
Which of the following statement is correct?
The volumetric efficiency of the compressor is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.
For minimum work required to compress and deliver a quantity of air by multi-stage compression,
Slip factor in a centrifugal compressor indicates the amount of air leaked from the storage vessel.
A centrifugal compressor is an axial flow compressor.
The speed of rotary air compressor is __________ as compared to reciprocating air compressor.
Separators are generally used in air compressor installations
The multi-stage compression ofair as compared to single stage compression
The volume of air sucked by the compressor during its suction stroke is called
The ratio of the isentropic work to the Euler's work is known as pressure coefficient.
A compressor must be driven by some prime mover.
When air is to be compressed at a high pressure, then it is advantageous to use
If the flow of air through the compressor is perpendicular to its axis, then it is a
Which one of the following is the effect of blade shape on performance of a centrifugal compressor ?
A turbo-prop is preferred to turbo-jet because
The absolute pressure of air at the outlet of a compressor is called
In air compressors, free air delivery means the
In a jet engine, the air-fuel ratio is
The air power of the compressor is also known as
The efficiency of the vane blower is (where W1 = Workdone due to compression, and W2 = Workdone due to back flow)
Volumetric efficiency of a compressor decreases with __________ in compression ratio.
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