Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
An open cycle gas turbine works on the same cycle as that of a closed cycle gas turbine.
Options- A. Yes
- B. No
- Correct Answer
- Yes
- 1. The efficiency of a jet engine is higher at
Options- A. low speeds
- B. high speeds
- C. low altitudes
- D. high altitudes Discuss
- 2. The maximum combustion pressure in gas turbine is __________ as compared to I.C. engine.
Options- A. more
- B. less Discuss
- 3. A rotary compressor is driven by an
Options- A. electric motor
- B. engine
- C. either (a) or (b)
- D. none of these Discuss
- 4. In the aircraft propellers
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 the presence of air
- D. none of the above Discuss
- 5. Which of the following statement is wrong?
Options- A. In a two stage reciprocating air compressor with complete intercooling, maximum work is saved.
- B. The minimum work required for a two stage reciprocating air compressor is double the work required for each stage.
- C. The ratio of the volume of free air delivery per stroke to the swept volume of the piston is called volumetric efficiency.
- D. none of the above Discuss
- 6. The maximum temperature in a gas turbine is
Options- A. 200°C
- B. 500°C
- C. 700°C
- D. 1000°C Discuss
- 7. 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
- 8. 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
- 9. A closed cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
Options- A. same
- B. lower
- C. higher Discuss
- 10. 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
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: high altitudes
Correct Answer: less
Correct Answer: either (a) or (b)
Correct Answer: the propulsive matter is ejected from within the propelled body
Correct Answer: none of the above
Correct Answer: 700°C
Correct Answer: the propulsive matter is caused to flow around the propelled body
Correct Answer: cause moisture and oil vapour to drop out
Correct Answer: higher
Correct Answer: p2 = p1.p3
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