Compressors, Gas Dynamics and Gas Turbines problems
- 1. The ratio of the discharge pressure to the inlet pressure of air is called
Options- A. compression ratio
- B. expansion ratio
- C. compressor efficiency
- D. volumetric efficiency Discuss
Correct Answer: compression ratio
- 2. Which of the following bladings will give maximum pressure rise in a centrifugal compressor, assuming the same overall dimensions, blade inlet angle and rotational speeds?
Options- A. Forward curved blades
- B. Backward curved blades
- C. Radial blades
- D. all of these Discuss
Correct Answer: Forward curved blades
- 3. 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
Correct Answer: degree of reaction
- 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
Correct Answer: discharge nozzle
- 5. Reheating in a multi-stage expansion gas turbine __________ compressor work.
Options- A. has no effect on
- B. decreases
- C. increases Discuss
Correct Answer: decreases
- 6. 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
Correct Answer: decreases with increase in compression ratio
- 7. 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
Correct Answer: swept volume
- 8. 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 Discuss
Correct Answer: radial flow compressor
- 9. The free air delivery is the volume of air that can be delivered by a compressor freely.
Options- A. True
- B. False Discuss
Correct Answer: False
- 10. A regenerator in a gas turbine improves thermal efficiency.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Correct
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