Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
In a centrifugal compressor, the highest Mach number leading to shock wave in the fluid flow occurs at
Options- A. diffuser inlet radius
- B. diffuser outlet radius
- C. impeller inlet radius
- D. impeller outlet radius
- Correct Answer
- diffuser outlet radius
- 1. Gas turbine as compared to internal combustion engine
Options- A. can be driven at a very high speed
- B. produces uniform torque
- C. has more efficiency
- D. all of these Discuss
- 2. The power actually developed by the engine cylinder of an I.C. engine is known as
Options- A. theoretical power
- B. actual power
- C. indicated power
- D. none of these Discuss
- 3. The air-fuel ratio of the petrol engine is controlled by
Options- A. carburettor
- B. injector
- C. governor
- D. none of these Discuss
- 4. A diesel engine has inlet valve, fuel injection valve and exhaust valve.
Options- A. Yes
- B. No Discuss
- 5. The relative efficiency of an I.C. engine is the ratio of the indicated thermal efficiency to the air standard efficiency.
Options- A. Correct
- B. Incorrect Discuss
- 6. In a gas turbine, air is obtained from the atmosphere and compressed in an air compressor.
Options- A. True
- B. False Discuss
- 7. If p1 is the pressure of air entering the L.P, cylinder and p3 is the pressure of air leaving the H.P. cylinder, then the ratio of cylinder diameters for a single acting, two stage reciprocating compressor with complete intercooling is given by
Options- A. D1/D2 = (p1p3)1/2
- B. D1/D2 = (p1/p3)1/4
- C. D1/D2 = (p1p3)1/4
- D. D1/D2 = (p3/p1)1/4 Discuss
- 8. The air is delivered __________ in one revolution in case of a three-lobbed rotor.
Options- A. two times
- B. three times
- C. four times
- D. six times Discuss
- 9. Maximum work is saved in a two stage reciprocating air compressor with incomplete intercooling.
Options- A. Agree
- B. Disagree Discuss
- 10. In a compressor, work is done on the piston during suction of air and work is done by the piston during compression as well as delivery of air.
Options- A. Agree
- B. Disagree Discuss
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: all of these
Correct Answer: indicated power
Correct Answer: carburettor
Correct Answer: Yes
Correct Answer: Correct
Correct Answer: True
Correct Answer: D1/D2 = (p3/p1)1/4
Correct Answer: six times
Correct Answer: Disagree
Correct Answer: Agree
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