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

Losses in a centrifugal compressor are due to__________________?

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

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

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

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

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 maximum compression ratio in an actual single stage axial flow comperssor is of the order of________________?

A. 1 : 1.2
B. 1 : 2
C. 1 : 5
D. 1 : 10

Surging is the phenomenon of___________________?

A. Air stream blocking the passage
B. Motion of air at sonic velocity
C. Unsteady, periodic and reversed flow
D. Air stream not able to follow the blade contour

The thermodynamic efficiency of rotary compressor is based on_______________?

A. Isothermal compression
B. Adiabatic compression
C. Isentropic compression
D. Polytropic compression

Maximum delivery pressure is a rotary air compressor is of the order of__________________?

A. 6 kg/cm2
B. 10 kg/cm2
C. 16 kg/cm2
D. 25 kg/cm2