Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
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
- Correct Answer
- centrifugal compressor
- 1. 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
- 2. The ratio of the isentropic work to the Euler's work is known as pressure coefficient.
Options- A. Yes
- B. No Discuss
- 3. 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
- 4. 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
- 5. 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
- 6. 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
- 7. For minimum work in multi-stage compression, the workdone on all stages should be equal.
Options- A. Yes
- B. No Discuss
- 8. In a closed cycle gas turbine, the air is compressed
Options- A. isothermally
- B. polytropically
- C. isentropically
- D. none of these Discuss
- 9. 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 Discuss
- 10. 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
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: in a single cylinder on both sides of the piston
Correct Answer: Yes
Correct Answer: perpendicular
Correct Answer: volume of air delivered by the compressor
Correct Answer: 0.5
Correct Answer: three times
Correct Answer: Yes
Correct Answer: isentropically
Correct Answer: all of these
Correct Answer: compresses 3 m3/ min of free air
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