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Quiz 3
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Q.1
The rotary compressors are suitable for large discharge of air at low pressure.
True
False
Q.2
The volumetric efficiency for reciprocating air compressors is about
10 to 40%
40 to 60%
60 to 70%
70 to 90%
Q.3
A rocket works with maximum overall efficiency when air-craft velocity is __________ the jet velocity.
equal to
one-half
double
Q.4
The compressed air may be used
in gas turbine plants
for operating pneumatic drills
in starting and supercharging of I. engines
all of the above
Q.5
In a four stage compressor, if the pressure at the first and third stage are 1 bar andbar, then the delivery pressure at the fourth stage will be
1 bar
16 bar
64 bar
256 bar
Q.6
The reason for volumetric efficiency of reciprocating compressor being less thanpercent is
Pressure drop across the valves
Superheating in compressor
Clearance volume and leakages
All of these
Q.7
The work-done on a compressor will be minimum if air is taken from
The atmosphere
A source at 0° C
A source of low temperature air
A source of high temperature air
Q.8
The maximum delivery pressure in a rotary air compressor is
10 bar
20 bar
30 bar
50 bar
Q.9
Propulsion efficiency of the following order is obtained in practice
34%
50%
60%
72%
Q.10
The type of rotary compressor used in aeroplanes, is of
Centrifugal type
Axial flow type
Radial flow type
None of these
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