Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
The speed of rotary air compressor is __________ as compared to reciprocating air compressor.
Options- A. high
- B. low
- Correct Answer
- high
- 1. 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
- 2. The absolute pressure of air at the outlet of a compressor is called
Options- A. back pressure
- B. critical pressure
- C. discharge pressure
- D. none of these Discuss
- 3. The assumption made in two stage compression with intercooler is that
Options- A. there is no pressure drop in the intercooler
- B. the compression in both the cylinders is polytropic
- C. the suction and delivery of air takes place at constant pressure
- D. all of the above Discuss
- 4. Standard air is the air at __________ and relative humidity of 36 percent.
Options- A. 0.1 bar and 20° C
- B. 1 bar and 20° C
- C. 0.1 bar and 40° C
- D. 1 bar and 40° C Discuss
- 5. The ratio of the isothermal power to the shaft power or brake power of the motor or engine required to drive the compressor is called overall isothermal efficiency.
Options- A. True
- B. False Discuss
- 6. A centrifugal compressor is an axial flow compressor.
Options- A. Correct
- B. Incorrect Discuss
- 7. 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
- 8. The basic principle of the rocket propulsion is the same as that of jet propulsion.
Options- A. Yes
- B. No Discuss
- 9. 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
- 10. 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
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: indicated power
Correct Answer: discharge pressure
Correct Answer: all of the above
Correct Answer: 1 bar and 20° C
Correct Answer: True
Correct Answer: Incorrect
Correct Answer: multi-stage compression with intercooling
Correct Answer: Yes
Correct Answer: compression ratio
Correct Answer: Forward curved blades
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