Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
A closed cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
Options- A. same
- B. lower
- C. higher
- Correct Answer
- higher
- 1. 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
- 2. 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 Discuss
- 3. The maximum temperature in a gas turbine is
Options- A. 200°C
- B. 500°C
- C. 700°C
- D. 1000°C Discuss
- 4. An open cycle gas turbine works on the same cycle as that of a closed cycle gas turbine.
Options- A. Yes
- B. No Discuss
- 5. The efficiency of a jet engine is higher at
Options- A. low speeds
- B. high speeds
- C. low altitudes
- D. high altitudes Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. The actual volume of air delivered by a compressor, When reduced to the normal temperature and pressure conditions is called compressor capacity.
Options- A. Yes
- B. No Discuss
- 10. Rotary compressors are used for delivering
Options- A. small quantities of air at high pressures
- B. large quantities of air at high pressures
- C. small quantities of air at low pressures
- D. large quantities of air at low pressures Discuss
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: cause moisture and oil vapour to drop out
Correct Answer: the propulsive matter is caused to flow around the propelled body
Correct Answer: 700°C
Correct Answer: Yes
Correct Answer: high altitudes
Correct Answer: p2 = p1.p3
Correct Answer: mechanical efficiency
Correct Answer: True
Correct Answer: No
Correct Answer: large quantities of air at low pressures
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