Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
If the clearance ratio for a reciprocating air compressor is 'K', then its volumetric efficiency is given by
Options- A.
- B.
- C.
- D.
- Correct Answer
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- 1. A turbo-prop is preferred to turbo-jet because
Options- A. it has high propulsive efficiency at high speeds
- B. it can fly at super sonic speeds
- C. it can fly at high elevations
- D. it has high power for take off Discuss
- 2. For minimum work required to compress and deliver a quantity of air by multi-stage compression,
Options- A. the compression ratio in each stage should be same
- B. the intercooling should be perfect
- C. the workdone in each stage should be same
- D. all of the above Discuss
- 3. If the flow of air through the compressor is parallel to its axis, then the compressor is
Options- A. reciprocating compressor
- B. centrifugal compressor
- C. axial flow compressor
- D. turbo-compressor Discuss
- 4. Which of the following statement is correct?
Options- A. The reciprocating compressors are best suited for high pressure and low volume capacity
- B. The effect of clearance volume on power consumption is negligible for the same volume of discharge
- C. both (a) and (b)
- D. none of these Discuss
- 5. Volumetric efficiency of a compressor decreases with __________ in compression ratio.
Options- A. decrease
- B. increase Discuss
- 6. In a high pressure compressor, the delivery pressure is
Options- A. 1 to 5 bar
- B. 5 to 8 bar
- C. 8 to 10 bar
- D. 10 to 15 bar Discuss
- 7. In a single stage, single acting reciprocating air compressor without clearance volume, the workdone is maximum during
Options- A. isothermal compression
- B. isentropic compression
- C. polytropic compression
- D. none of these Discuss
- 8. The volume of air delivered in a medium capacity air compressor per unit time is
Options- A. 0.1 to 1.2 m3/s
- B. 0.15 to 5 m3/s
- C. above 5 m3/s
- D. none of these Discuss
- 9. A simple turbo-jet engine is basically a gas turbine engine equipped with a propulsive nozzle and diffuser.
Options- A. Agree
- B. Disagree Discuss
- 10. The propulsive power of the rocket is (where v1 = Jet velocity, and v2 = Air-craft velocity)
Options- A.
- B.
- C.
- D.
Discuss
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: it has high power for take off
Correct Answer: all of the above
Correct Answer: axial flow compressor
Correct Answer: both (a) and (b)
Correct Answer: increase
Correct Answer: 8 to 10 bar
Correct Answer: isentropic compression
Correct Answer: 0.15 to 5 m3/s
Correct Answer: Agree
Correct Answer:
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