Related Questions

Centrifugal compressors compared to reciprocating compressors
A Require less space
B Have quieter operation
C Have lower operating costs
D All of the above
Rotary compressors are suitable for
A Large discharge at high pressure
B Low discharge at high pressure
C Large discharge at low pressure
D Low discharge at low pressure
The motor used for the compressors is
A d.c. series motor
B shaded pole motor
C capacitor-start capacitor-run motor
D reluctance motor
Multistage compressors are used in industry, because they
A Reduce the cost of compressor
B Reduce the size requirement
C Resemble closely to isothermal compression
D Are easy to control
In air compressors, free air delivery means the
A Actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
B Volume of air delivered by the compressor
C Volume of air sucked by the compressor during its suction stroke
D None of the above
The degree of reaction is usually kept ________ for all types of axial flow compressors.
A 0.2
B 0.3
C 0.4
D 0.5
Inter-cooling in multistage compressors is done
A To cool the air during compression
B To cool the air at delivery
C To enable compression in two stages
D To minimize the work of compression
During peak load periods, the best method of controlling compressors is
A Start-stop motor
B Constant speed unloader
C Relief valve
D Variable speed
Inter cooling in compressors
A Cools the delivered air
B Results in saving of power in compressing a given volume to given pressure
C Is the standard practice for big compressors
D Enables compression in two stages
The volumetric efficiency for reciprocating air compressors is about
A 10 to 40%
B 40 to 60%
C 60 to 70%
D 70 to 90%

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