The ratio of isentropic work to euler’s work is known as _____________________?

A. Compressor efficiency
B. Isentropic efficiency
C. Euler’s efficiency
D. Pressure coefficient

The ratio of outlet whirl velocity to blade velocity in case of centrifugal compressor is called__________________?

A. Slip factor
B. Velocity factor
C. Velocity coefficient
D. Blade effectiveness

More than one stage will be preferred for reciprocating compressor if the delivery pressure is more than____________________?

A. 2 kg/cm2
B. 6 kg/cm2
C. 10 kg/cm2
D. 14.7 kg/cm2

Pick up the wrong statement about advantages of multistage compression____________________?

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

Losses in a centrifugal compressor are due to__________________?

A. Inlet losses
B. Impeller channel losses
C. Diffuser losses
D. All of the above

For a two stage compressor* if index of compression for higher stage is greater than index of compression for lower stage, then the optimum pressure as compared to ideal case will___________________?

A. Increase
B. Decrease
C. Remain unaffected
D. Other factors control it

The criterion of the thermodynamic efficiency for rotary compressor is_________________?

A. Isentropic compression
B. Isothermal compression
C. Polytropic compression
D. Any one of the above

The volumetric efficiency of a compressor falls roughly as follows for every 5°C increase in atmospheric temperature__________________?

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

For minimum work in multistage compression, assuming same index of compression in all stages_________________?

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

Which is false statement about advantages of multistage compressor in comparison to single stage compressor_________________?

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