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
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 - Adiabatic process is________________?
A. essentially an isentropic process
B. non-heat transfer process
C. reversible process
D. constant temperature process
E. constant enthalpy process - Isothermal compression effeicency can be attained by running the compressor__________________?
A. at very high speed
B. at very slow speed
C. at average speed
D. at zero speed
E. isothermally - 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 - Isothermal compression though most efficient, but is not -practicable because_________________?
A. ityrequires very big cylinder
B. it does not increase pressure much
C. it is impossible in practice
D. compressor has to run at very slow speed to achieve it
E. it requires cylinder to be placed in water - 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 - Compression efficiency is compared against_____________________?
A. ideal compression
B. adiabatic compression
C. botii isothermal and adiabatic compression
D. isentropic compression
E. isothermal compression
