Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
A compressor mostly used for supercharging of I.C. engines is
Options- A. radial flow compressor
- B. axial flow compressor
- C. roots blower
- D. reciprocating compressor
- Correct Answer
- radial flow compressor
- 1. The volume of air sucked by the compressor during its suction stroke is called
Options- A. free air delivery
- B. compressor capacity
- C. swept volume
- D. none of these Discuss
- 2. The volumetric efficiency of a compressor
Options- A. increases with decrease in compression ratio
- B. decreases with decrease in compression ratio
- C. increases with increase in compression ratio
- D. decreases with increase in compression ratio Discuss
- 3. Reheating in a multi-stage expansion gas turbine __________ compressor work.
Options- A. has no effect on
- B. decreases
- C. increases Discuss
- 4. In a jet propulsion unit, the products of combustion after passing through the gas turbine are discharged into
Options- A. atmosphere
- B. vacuum
- C. discharge nozzle
- D. back to the compressor Discuss
- 5. In an axial flow compressor, the ratio of pressure in theTOtor blades to the pressure rise in the compressor in one stage is known as
Options- A. work factor
- B. slip factor
- C. degree of reaction
- D. pressure coefficient Discuss
- 6. The free air delivery is the volume of air that can be delivered by a compressor freely.
Options- A. True
- B. False Discuss
- 7. A regenerator in a gas turbine improves thermal efficiency.
Options- A. Correct
- B. Incorrect Discuss
- 8. The velocity of air entering in a rocket is __________ as compared to an aircraft.
Options- A. zero
- B. less
- C. more
- D. same Discuss
- 9. In a jet engine, the air-fuel ratio is
Options- A. 30:1
- B. 40:1
- C. 50:1
- D. 60:1 Discuss
- 10. The workdone on a compressor will be minimum if air is taken from
Options- A. the atmosphere
- B. a source at 0° C
- C. a source of low temperature air
- D. a source of high temperature air Discuss
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: swept volume
Correct Answer: decreases with increase in compression ratio
Correct Answer: decreases
Correct Answer: discharge nozzle
Correct Answer: degree of reaction
Correct Answer: False
Correct Answer: Correct
Correct Answer: zero
Correct Answer: 60:1
Correct Answer: a source of low temperature air
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