Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
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
- Correct Answer
- mechanical efficiency
- 1. 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
- 2. A closed cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
Options- A. same
- B. lower
- C. higher Discuss
- 3. 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
- 4. 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
- 5. The maximum temperature in a gas turbine is
Options- A. 200°C
- B. 500°C
- C. 700°C
- D. 1000°C Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. The type of rotary compressor used in gas turbines, is of
Options- A. centrifugal type
- B. axial flow type
- C. radial flow type
- D. none of these Discuss
- 10. The capacity of a compressor is expressed in
Options- A. kg/m2
- B. kg/m3
- C. m3/min
- D. m3/kg Discuss
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: p2 = p1.p3
Correct Answer: higher
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: True
Correct Answer: No
Correct Answer: large quantities of air at low pressures
Correct Answer: axial flow type
Correct Answer: m3/min
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