Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
The reason for volumetric efficiency of reciprocating compressor being less than 100 percent is
Options- A. pressure drop across the valves
- B. superheating in compressor
- C. clearance volume and leakages
- D. all of these
- Correct Answer
- all of these
- 1. In a closed cycle gas turbine, the air is compressed
Options- A. isothermally
- B. polytropically
- C. isentropically
- D. none of these Discuss
- 2. For minimum work in multi-stage compression, the workdone on all stages should be equal.
Options- A. Yes
- B. No Discuss
- 3. The minimum work required for a three stage reciprocating air compressor is __________ the work required for each stage.
Options- A. equal to
- B. double
- C. three times
- D. six times Discuss
- 4. If the flow of air through the compressor is perpendicular to its axis, then it is a
Options- A. reciprocating compressor
- B. centrifugal compressor
- C. axial flow compressor
- D. turbo compressor Discuss
- 5. In a double acting compressor, the air is compressed
Options- A. in one cylinder
- B. in two cylinders
- C. in a single cylinder on both sides of the piston
- D. in two cylinders on both sides of the piston Discuss
- 6. A 3 m3/min compressor means that it
Options- A. compresses 3 m3/min of standard air
- B. compresses 3 m3/ min of free air
- C. delivers 3 m3/ min of compressed air
- D. delivers 3 m3/ min of compressed air at delivery pressure Discuss
- 7. Slip factor in a centrifugal compressor indicates the amount of air leaked from the storage vessel.
Options- A. Yes
- B. No Discuss
- 8. The compression ratio for the compressor is always __________ unity.
Options- A. equal to
- B. less than
- C. more than Discuss
- 9. 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
- 10. With the decrease in compression ratio, the volumetric efficiency
Options- A. does not change
- B. increases
- C. decreases Discuss
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: isentropically
Correct Answer: Yes
Correct Answer: three times
Correct Answer: centrifugal compressor
Correct Answer: in a single cylinder on both sides of the piston
Correct Answer: compresses 3 m3/ min of free air
Correct Answer: No
Correct Answer: more than
Correct Answer: all of the above
Correct Answer: increases
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