Which of the following statement is correct as regard to centrifugal compressors?

A The flow of air is parallel to the axis of the compressor
B The static pressure of air in the impeller increases in order to provide centripetal force on the air
C The impeller rotates at high speeds
D The maximum efficiency is higher than multistage axial flow compressors

Correct Answer: The static pressure of air in the impeller increases in order to provide centripetal force on the air

In centrifugal compressor The static pressure of air in the impeller increases in order to provide centripetal force on the air
Bissoy MCQ
#Mechanical Engineering #Compressors #Gas Turbines And Jet Engines

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
Rotary compressors are used for delivering
A Small quantities of air at high pressures
B Large quantities of air at high pressures
C Small quantities of air at low pressures
D Large quantities of air at low pressures
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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