Compressors

A. compressor efficiency
B. isentropic efficiency
C. Euler’s efficiency
D. pressure coefficient
E. pressure ratio

A. slip factor
B. velocity factor
C. velocity coefficient
D. blade effectiveness

A. 2 kg/cm2
B. 6 kg/cm2
C. 10 kg/cm2
D. 14.7 kg/cm2
E. none of the above

A. better lubrication is possible advantages of multistage
B. more loss of air due to leakage past the cylinder
C. mechanical balance is better
D. air can be cooled perfectly in between
E. more uniform torque, light cylinder and saving in work

A. inlet losses
B. impeller channel losses
C. diffuser losses
D. all of the above
E. none of the above

A. increase
B. decrease
C. remain unaffected
D. other factors control it
E. unpredictable

A. isentropic compression
B. isothermal compression
C. polytropic compression
D. any one of the above
E. none of the above

A. 0.1%
B. 0.5%
C. 1%
D. 5%
E. 10%.

A. work done in first stage should be more
B. work done in subsequent stages should increase
C. work done in subsequent stages should decrease
D. work done in all stages should be equal
E. work done in any stage is no criterion for minimum work but depends on other factors

A. less power requirement
B. better mechanical balance
C. less loss of air due to leakage past the cylinder
D. more effective lubrication
E. lower volumetric efficiency