Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
In a single stage, single acting reciprocating air compressor, without clearance volume, the workdone is minimum during
Options- A. isothermal compression
- B. isentropic compression
- C. polytropic compression
- D. none of these
- Correct Answer
- isothermal compression
- 1. The overall isothermal efficiency of the compressor is defined as the ratio of
Options- A. work required to compress the air isothermally to the actual work required to compress the air for the same pressure ratio
- B. isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
- C. volume of free air delivery per stroke to the swept volume of the piston
- D. isentropic power to the power required to drive the compressor Discuss
- 2. With the decrease in compression ratio, the volumetric efficiency
Options- A. does not change
- B. increases
- C. decreases Discuss
- 3. The thrust of a jet propulsion power unit can be increased by
Options- A. injecting water into the compressor
- B. burning fuel after gas turbine
- C. injecting ammonia into the combustion chamber
- D. all of the above Discuss
- 4. The compression ratio for the compressor is always __________ unity.
Options- A. equal to
- B. less than
- C. more than Discuss
- 5. Slip factor in a centrifugal compressor indicates the amount of air leaked from the storage vessel.
Options- A. Yes
- B. No Discuss
- 6. The volumetric efficiency of the compressor is defined as the ratio of volume of free air delivery per stroke to the swept volume of the piston.
Options- A. Yes
- B. No Discuss
- 7. The gas in cooling chamber of a closed cycle gas turbine is cooled at
Options- A. constant volume
- B. constant temperature
- C. constant pressure
- D. none of these Discuss
- 8. A compressor must be driven by some prime mover.
Options- A. Agree
- B. Disagree Discuss
- 9. The overall thermal efficiency of an ideal gas turbine plant is (where r = Pressure ratio)
Options- A. r? - 1
- B. 1 - r? - 1
- C.
- D.
Discuss
- 10. In air compressors, free air delivery means the
Options- A. actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
- B. volume of air delivered by the compressor
- C. volume of air sucked by the compressor during its suction stroke
- D. none of the above Discuss
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: isothermal power to the shaft power or B.P. of the motor or engine required to drive the compressor
Correct Answer: increases
Correct Answer: all of the above
Correct Answer: more than
Correct Answer: No
Correct Answer: Yes
Correct Answer: constant pressure
Correct Answer: Agree
Correct Answer:
Correct Answer: actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
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