Compressors, Gas Dynamics and Gas Turbines problems
- 1. For a multi-stage compressor, the polytropic efficiency is constant throughout for all the stages.
Options- A. True
- B. False Discuss
Correct Answer: True
- 2. The degree of reaction is usually kept __________ for all types of axial flow compressors.
Options- A. 0.2
- B. 0.3
- C. 0.4
- D. 0.5 Discuss
Correct Answer: 0.5
- 3. The compressor capacity is defined as 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
Correct Answer: volume of air delivered by the compressor
- 4. In a centrifugal compressor, the flow of air is __________ to the axis of compressor.
Options- A. parallel
- B. perpendicular
- C. inclined
- D. none of these Discuss
Correct Answer: perpendicular
- 5. The ratio of the isentropic work to the Euler's work is known as pressure coefficient.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 6. 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
Correct Answer: in a single cylinder on both sides of the piston
- 7. 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
Correct Answer: centrifugal compressor
- 8. 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
Correct Answer: three times
- 9. For minimum work in multi-stage compression, the workdone on all stages should be equal.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
- 10. In a closed cycle gas turbine, the air is compressed
Options- A. isothermally
- B. polytropically
- C. isentropically
- D. none of these Discuss
Correct Answer: isentropically
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