Compressors, Gas Dynamics and Gas Turbines problems
- 1. When the outlet angle from the rotor of a centrifugal compressor is more than 90°, then the blades are said to be
Options- A. forward curved
- B. backward curved
- C. radial
- D. none of these Discuss
Correct Answer: forward curved
- 2. 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
Correct Answer: True
- 3. 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
Correct Answer: 1 bar and 20° C
- 4. 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
Correct Answer: all of the above
- 5. 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
Correct Answer: discharge pressure
- 6. 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
Correct Answer: indicated power
- 7. The speed of rotary air compressor is __________ as compared to reciprocating air compressor.
Options- A. high
- B. low Discuss
Correct Answer: high
- 8. A centrifugal compressor is an axial flow compressor.
Options- A. Correct
- B. Incorrect Discuss
Correct Answer: Incorrect
- 9. 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
Correct Answer: multi-stage compression with intercooling
- 10. The basic principle of the rocket propulsion is the same as that of jet propulsion.
Options- A. Yes
- B. No Discuss
Correct Answer: Yes
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