Compressors, Gas Dynamics and Gas Turbines problems
- 1. 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
Correct Answer: True
- 2. 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
Correct Answer: No
- 3. 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
Correct Answer: large quantities of air at low pressures
- 4. 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
Correct Answer: axial flow type
- 5. The capacity of a compressor is expressed in
Options- A. kg/m2
- B. kg/m3
- C. m3/min
- D. m3/kg Discuss
Correct Answer: m3/min
- 6. An axial compressor gives optimum performance at high speeds and large volume flows.
Options- A. Agree
- B. Disagree Discuss
Correct Answer: Agree
- 7. 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
Correct Answer: reduced volume flow rate
- 8. 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
Correct Answer: increases net output but decreases thermal efficiency
- 9. The rotary compressors are suitable for large discharge of air at low pressure.
Options- A. True
- B. False Discuss
Correct Answer: True
- 10. The ratio of the volume of free air delivery per stroke to the swept volume of the piston, is known as
Options- A. compressor efficiency
- B. volumetric efficiency
- C. isothermal efficiency
- D. mechanical efficiency Discuss
Correct Answer: volumetric efficiency
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