Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
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
- Correct Answer
- large quantities of air at low pressures
- 1. 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
- 2. 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
- 3. 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
- 4. 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
- 5. A closed cycle gas turbine gives __________ efficiency as compared to an open cycle gas turbine.
Options- A. same
- B. lower
- C. higher Discuss
- 6. 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
- 7. The capacity of a compressor is expressed in
Options- A. kg/m2
- B. kg/m3
- C. m3/min
- D. m3/kg Discuss
- 8. An axial compressor gives optimum performance at high speeds and large volume flows.
Options- A. Agree
- B. Disagree Discuss
- 9. A large clearance Volume in a reciprocating compressor results in
Options- A. reduced volume flow rate
- B. increased volume flow rate
- C. lower suction pressure
- D. lower delivery pressure Discuss
- 10. Intercooling in gas turbines
Options- A. decreases net output but increases thermal efficiency
- B. increases net output but decreases thermal efficiency
- C. decreases net output and thermal efficiency both
- D. increases net output and thermal efficiency both Discuss
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: No
Correct Answer: True
Correct Answer: mechanical efficiency
Correct Answer: p2 = p1.p3
Correct Answer: higher
Correct Answer: axial flow type
Correct Answer: m3/min
Correct Answer: Agree
Correct Answer: reduced volume flow rate
Correct Answer: increases net output but decreases thermal efficiency
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