Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
For perfect intercooling in a two stage compressor,
Options- A.
- B.
- C. p1 = p3
- D. p1 = p2 p3
- Correct Answer
-
- 1. The workdone on a compressor will be minimum if air is taken from
Options- A. the atmosphere
- B. a source at 0° C
- C. a source of low temperature air
- D. a source of high temperature air Discuss
- 2. In a jet engine, the air-fuel ratio is
Options- A. 30:1
- B. 40:1
- C. 50:1
- D. 60:1 Discuss
- 3. The velocity of air entering in a rocket is __________ as compared to an aircraft.
Options- A. zero
- B. less
- C. more
- D. same Discuss
- 4. A regenerator in a gas turbine improves thermal efficiency.
Options- A. Correct
- B. Incorrect Discuss
- 5. The free air delivery is the volume of air that can be delivered by a compressor freely.
Options- A. True
- B. False Discuss
- 6. The efficiency of the vane blower is (where W1 = Workdone due to compression, and W2 = Workdone due to back flow)
Options- A.
- B.
- C.
- D.
Discuss
- 7. In a two stage reciprocating compressor with intercooler, the amount of work saved with incomplete intercooling is __________ that in case of complete intercooling.
Options- A. less than
- B. more than Discuss
- 8. Which one of the following is the effect of blade shape on performance of a centrifugal compressor?
Options- A. Backward curved blades has poor efficiency
- B. Backward curved blades lead to stable performance
- C. Forward curved blades has higher efficiency
- D. Forward curved blades produce lower pressure ratio Discuss
- 9. The multi-stage compression ofair as compared to single stage compression
Options- A. improves volumetric efficiency for the given pressure ratio
- B. reduces workdone per kg of air
- C. gives more uniform torque
- D. all of these Discuss
- 10. The centrifugal compressors are generally used for refrigerants that require
Options- A. small displacements and low condensing pressures
- B. large displacements and high condensing pressures
- C. small displacements and high condensing pressures
- D. large displacements and low condensing pressures Discuss
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: a source of low temperature air
Correct Answer: 60:1
Correct Answer: zero
Correct Answer: Correct
Correct Answer: False
Correct Answer:
Correct Answer: less than
Correct Answer: Forward curved blades produce lower pressure ratio
Correct Answer: all of these
Correct Answer: large displacements and low condensing pressures
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