Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
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
- Correct Answer
- compression ratio
- 1. The basic principle of the rocket propulsion is the same as that of jet propulsion.
Options- A. Yes
- B. No Discuss
- 2. When air is to be compressed at a high pressure, then it is advantageous to use
Options- A. single stage compression
- B. multi-stage compression without intercooling
- C. multi-stage compression with intercooling
- D. none of these Discuss
- 3. A centrifugal compressor is an axial flow compressor.
Options- A. Correct
- B. Incorrect Discuss
- 4. The speed of rotary air compressor is __________ as compared to reciprocating air compressor.
Options- A. high
- B. low Discuss
- 5. The air power of the compressor is also known as
Options- A. indicated power
- B. brake power
- C. frictional power
- D. none of these Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. Reheating in a multi-stage expansion gas turbine __________ compressor work.
Options- A. has no effect on
- B. decreases
- C. increases Discuss
- 10. 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
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: Yes
Correct Answer: multi-stage compression with intercooling
Correct Answer: Incorrect
Correct Answer: high
Correct Answer: indicated power
Correct Answer: Forward curved blades
Correct Answer: degree of reaction
Correct Answer: discharge nozzle
Correct Answer: decreases
Correct Answer: decreases with increase in compression ratio
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