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
Related Mcqs:
- 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
E. lower volumetric efficiency - 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 - Pick up the wrong statement ?
A. centrifugal compressors deliver prac-tically constant pressure over a considerable range of capacities
B. Axial flow compressors have a sub-stantially constant delivery at variable pressures
C. centrifugal compressors have a wider stable operating range than axial flow compressors
D. axial flow compressors are bigger in diameter compared to centrifugal type
E. axial flow compressors apt to be longer as compared to centrifugal type - Pick up the wrong statement ?
A. large gas turbines employ axial flow compressors
B. axial flow compressors are more stable than centrifugal type compressors but not as efficient
C. axial flow compressors have high capacity and efficiency
D. axial flow compressors have instability region of operation
E. centrifugal compressors are used mainly on low flow pressure ratio gas turbines - Pick up the wrong statement ?
A. pulsojet requires no ambient air for propulsion
B. ramjet-engine has no turbine
C. turbine drives compressor in a burbojet
D. bypass turbo-jet engine increases the thrust without adversely affecting, the propulsive efficiency and fuel economy
E. propeller is an indirect reaction device - 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 - 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 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
E. work done in any stage is no criterion for minimum work but depends on other factors - 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 - Pick up the correct statement ?
A. gas turbine uses low air-fuel ratio to economise on fuel
B. gas turhine uses high air-fuel ratio to reduce outgoing temperature
C. gas turbine uses low air-fuel ratio to develop the high thrust required
D. all of the above
E. none of the above
