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
Related Mcqs:
- The advantage of multistage compression over single stage compression is ________________?
A. lower power consumption per unit of air delivered
B. higher volumetric efficiency
C. decreased discharge temperature
D. moisture free air
E. 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
E. unpredictable - Which is false statement about multistage compression ?
A. Power consumption per unit of air delivered is low
B. Volumetric efficiency is high
C. It is best suited for compression ratios around 7:1
D. The moisture in air is condensed in the intercooler
E. Outlet temperature is reduced - In multistage compressor, the isothermal compression is achieved by_________________?
A. employing intercooler
B. by constantly cooling the cylinder
C. by running compressor at very slow speed
D. by insulating the cylinder
E. none of the above - Isothermal compression efficiency, even when running at high speed, can be approached by using A. multi-stage compression B. cold water spray C. both A. and B. above D. fully insulating the cylinder E. high stroke_________________?
Isothermal compression efficiency, even when running at high speed, can be approached by using
A. multi-stage compression
B. cold water spray
C. both A. and B. above
D. fully insulating the cylinder
E. high stroke - Maximum work is done in compressing air when the compression is_________________?
A. isothermal
B. adiabatic
C. polytropic
D. any one of the above
E. none of the above - The work done per unit mass of air in compression will’be least when n is equal to______________?
A. 1
B. 1.2 ,
C. 1.3
D. 1.4
E. 1.5 - For a compressor, least work will be done if the compression is________________ ?
A. isentropic
B. isothermal
C. polytropic
D. somewhere in between isentropic and isothermal
E. none 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
E. more uniform torque, light cylinder and saving in work - Reheating in multistage expansion gas turbine results in____________________?
A. high thermal efficiency
B. reduction in compressor work
C. decrease of heat loss in exhaust
D. maximum work output
E. none of the above
