A. same as isothermal
B. same as adiabatic
C. better than isothermal and adiabatic
D. in between isothermal and adiabatic
E. none of the above
Related Mcqs:
- 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 - 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 - 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 - 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
E. 1 : 1 - Adiabatic compression is one in which___________________?
A. temperature during compression remains constant
B. no heat leaves or enters the compressor cylinder during cornpression
C. temperature rise follows a linear relationship
D. work done is maximum
E. entropy decreases - Compression efficiency is compared against_____________________?
A. ideal compression
B. adiabatic compression
C. botii isothermal and adiabatic compression
D. isentropic compression
E. isothermal compression - 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 - Ram compression in turbojet involves____________________?
A. reduction of speed of incoming air and conversion of part of it into pressure energy
B. compression of inlet air
C. increasing speed of incoming air
D. lost work
E. leakage losses - In jet engines the compression ratio__________________?
A. varies as square root of the speed
B. Varies linearly to the speed
C. varies as square of the speed
D. varies as cube of the speed
E. is constant irrespective of variation in speed
