Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
The efficiency of roots blower __________ with the increase in pressure ratio.
Options- A. decreases
- B. increases
- C. does not change
- Correct Answer
- decreases
- 1. In open cycle turbo-jet engines used in military aircraft, reheating the exhaust gas from the turbine by burning, more fuel is used to increase the
Options- A. thrust and range of aircraft
- B. efficiency of the engine
- C. both (a) and (b)
- D. none of these Discuss
- 2. In a single acting reciprocating air compressor, without clearance, the compression of air may be
Options- A. isothermal
- B. polytropic
- C. isentropic
- D. any one of these Discuss
- 3. For perfect intercooling in a three stage compressor,
Options- A.
- B.
- C. p1p2 = p3p4
- D. p1p3 = p2p4 Discuss
- 4. The perfect intercooling, in multistage compression, means that the temperature of air at inlet to subsequent stages is equal to the initial temperature.
Options- A. Agree
- B. Disagree Discuss
- 5. In reciprocating air compressors, isothermal efficiency is used for all sorts of calculations.
Options- A. Correct
- B. Incorrect Discuss
- 6. A closed cycle gas turbine works on
Options- A. Carnot cycle
- B. Rankine cycle
- C. Ericsson cycle
- D. Joule cycle Discuss
- 7. The clearance, in a single stage, single acting reciprocating air compressor does not effect the workdone on the air and the power required for compressing the air.
Options- A. True
- B. False Discuss
- 8. For a multi-stage compressor, the polytropic efficiency is constant throughout for all the stages.
Options- A. True
- B. False Discuss
- 9. 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
- 10. 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
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: thrust and range of aircraft
Correct Answer: any one of these
Correct Answer:
Correct Answer: Agree
Correct Answer: Correct
Correct Answer: Joule cycle
Correct Answer: True
Correct Answer: True
Correct Answer: 0.5
Correct Answer: volume of air delivered by the compressor
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