Discussion
Home ‣ Mechanical Engineering ‣ Compressors, Gas Dynamics and Gas Turbines Comments
- Question
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
- Correct Answer
- 1 bar and 20° C
- 1. 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
- 2. 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
- 3. In axial flow compressors, the flow of air is parallel to the axis of compressor.
Options- A. Correct
- B. Incorrect Discuss
- 4. The mean effective pressure of the compressor is the
Options- A. actual volume of the air delivered by the compressor when reduced to normal temperature and pressure conditions
- B. volume of air delivered by the compressor
- C. volume of air sucked by the compressor during its suction stroke
- D. none of the above Discuss
- 5. Separators are generally used in air compressor installations
Options- A. before the intercooler
- B. after the intercooler
- C. between the aftercooler and receiver
- D. before first stage suction Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. The speed of rotary air compressor is __________ as compared to reciprocating air compressor.
Options- A. high
- B. low Discuss
- 10. A centrifugal compressor is an axial flow compressor.
Options- A. Correct
- B. Incorrect Discuss
Compressors, Gas Dynamics and Gas Turbines problems
Search Results
Correct Answer: True
Correct Answer: forward curved
Correct Answer: Correct
Correct Answer: none of the above
Correct Answer: between the aftercooler and receiver
Correct Answer: all of the above
Correct Answer: discharge pressure
Correct Answer: indicated power
Correct Answer: high
Correct Answer: Incorrect
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