Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
In a jet propulsion
Options- A. the propulsive matter is ejected from within the propelled body
- B. the propulsive matter is caused to flow around the propelled body
- C. its functioning does not depend upon presence of air
- D. none of the above
- Correct Answer
- the propulsive matter is caused to flow around the propelled body
- 1. The maximum temperature in a gas turbine is
Options- A. 200°C
- B. 500°C
- C. 700°C
- D. 1000°C Discuss
- 2. An open cycle gas turbine works on the same cycle as that of a closed cycle gas turbine.
Options- A. Yes
- B. No Discuss
- 3. The efficiency of a jet engine is higher at
Options- A. low speeds
- B. high speeds
- C. low altitudes
- D. high altitudes Discuss
- 4. The maximum combustion pressure in gas turbine is __________ as compared to I.C. engine.
Options- A. more
- B. less Discuss
- 5. A rotary compressor is driven by an
Options- A. electric motor
- B. engine
- C. either (a) or (b)
- D. none of these Discuss
- 6. An aftercooler is used to
Options- A. remove impurities from air
- B. reduce volume of air
- C. cause moisture and oil vapour to drop out
- D. cool the air Discuss
- 7. A closed cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
Options- A. same
- B. lower
- C. higher Discuss
- 8. For a two stage reciprocating compressor, compression from p1 to p3 is with perfect intercooling and no pressure losses. If compression in both the cylinders follows the same polytropic process and the atmospheric pressure is pa, then the intermediate pressure p2 is given by
Options- A. p2 = (p1 + p3)/2
- B. p2 = p1.p3
- C. P2 = Pa x p3/p1
- D. p2 = pa p3/p1 Discuss
- 9. The ratio of the indicated power to the shaft power or brake power of the motor or engine required to drive the compressor, is called
Options- A. compressor efficiency
- B. volumetric efficiency
- C. isothermal efficiency
- D. mechanical efficiency Discuss
- 10. Workdone by a two-stage reciprocating air compressor per cycle is equal to the workdone in LP. cylinder and H.P. cylinder.
Options- A. True
- B. False Discuss
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: 700°C
Correct Answer: Yes
Correct Answer: high altitudes
Correct Answer: less
Correct Answer: either (a) or (b)
Correct Answer: cause moisture and oil vapour to drop out
Correct Answer: higher
Correct Answer: p2 = p1.p3
Correct Answer: mechanical efficiency
Correct Answer: True
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