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Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
Intercooling in multi-stage compressors is done
Options- A. to cool the air during compression
- B. to cool the air at delivery
- C. to enable compression in two stages
- D. to minimise the work of compression
- Correct Answer
- to minimise the work of compression
- 1. The increase in pressure in a vane blower takes place first due to compression and then due to back flow of air.
Options- A. Correct
- B. Incorrect Discuss
- 2. When the temperature of air leaving the intercooler, in a two stage compression with intercooler, is __________ the original atmospheric air temperature, then the intercooling is known as perfect or complete intercooling.
Options- A. equal to
- B. less than
- C. more than Discuss
- 3. The clearance volume in the compressor is kept minimum because it effects on volumetric efficiency.
Options- A. Correct
- B. Incorrect Discuss
- 4. Which of the following statement is correct?
Options- A. The ratio of the discharge pressure to the inlet pressure of air is called compressor efficiency.
- B. The compression ratio for the compressor is always greater than unity.
- C. The compressor capacity is the ratio of workdone per cycle to the stroke volume.
- D. During isothermal compression of air, the workdone in a compressor is maximum. Discuss
- 5. The ratio of workdone per cycle to the stroke volume of the compressor is known as
Options- A. compressor capacity
- B. compression ratio
- C. compressor efficiency
- D. mean effective pressure Discuss
- 6. The stagnation pressure rise in a centrifugal compressor takes place
Options- A. in the diffuser only
- B. in the impeller only
- C. in the diffuser and impeller
- D. in the inlet guide vanes only Discuss
- 7. The type of rotary compressor used in aeroplanes, is of
Options- A. centrifugal type
- B. axial flow type
- C. radial flow type
- D. none of these Discuss
- 8. In a centrifugal compressor, an increase in speed at a given pressure ratio causes
Options- A. increase in flow
- B. decrease in flow
- C. increase in efficiency
- D. increase in flow and decrease in efficiency Discuss
- 9. The total heat rejected in a reciprocating air compressor is equal to the sum of the heat rejected during polytropic compression per kg of air and heat rejected in the intercooler per kg of air.
Options- A. True
- B. False Discuss
- 10. High air-fuel ratio in gas turbines
Options- A. increases power output
- B. improves thermal efficiency
- C. reduces exhaust temperature
- D. do not damage turbine blades Discuss
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: Correct
Correct Answer: equal to
Correct Answer: Correct
Correct Answer: The compression ratio for the compressor is always greater than unity.
Correct Answer: mean effective pressure
Correct Answer: in the diffuser and impeller
Correct Answer: axial flow type
Correct Answer: increase in flow and decrease in efficiency
Correct Answer: True
Correct Answer: reduces exhaust temperature
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