The ratio of isentropic work to euler’s work is known as _____________________? A. compressor efficiency B. isentropic efficiency C. Euler’s efficiencyD. pressure coefficient E. pressure ratio
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 E. none of the above
Pick up the wrong statement about advantages of multistage compression____________________? A. better lubrication is possible advantages of multistageB. more loss of air due to leakage past the cylinder C. mechanical balance is better D. air can be cooled perfectly in…
Losses in a centrifugal compressor are due to__________________? A. inlet losses B. impeller channel losses C. diffuser lossesD. all of the above E. none 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…
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 E. none 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% E. 10%.
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 decreaseD. work…
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 lubricationE. lower volumetric…