A. increase
B. decrease
C. remain same
D. may increase/decrease depending on clearance volume
E. none of the above
Related Mcqs:
- 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 - There is a certain pressure ratio (optimum) for a gas turbine at which its thermal efficiency is maximum. With increase in turbine temperature, the value of pressure ratio for the peak efficiency would__________________?
A. remain same
B. decrease
C. increase
D. unpredictable
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 - The volumetric efficiency of a compressor falls roughly as follows for every 100 m increase in elevation___________________?
A. 0.1%
B. 0.5%
C. 1.0%
D. 5%
E. 10%. - 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%. - The pressure ratio of an ideal vaned compressor with increase in mass flow rate_________________?
A. increases
B. decreases
C. remains constant
D. first decreases and then increases
E. unpredictable - The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turine and fixed higher and lower temperature) with increase in pressure ratio will___________________?
A. increase first at fast rate and then slow
B. increase first at slow rate and then fast
C. decrease continuously
D. first increase, reach maximum and then decrease
E. none of the above - 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 - 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 - Ratio of compression is the ratio of__________________?
A. gauge discharge pressure to the gauge intake pressure
B. absolute discharge pressure to the ab-solute intake pressure
C. pressures at discharge and suction cor-responding to same temperature
D. stroke volume and clearance volume
E. none of the above
