Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
The relative coefficient of performance is equal to
Options- A.
- B.
- C. Actual C.O.P. x Theoretical C.O.P.
- D. none of these
- Correct Answer
-
- 1. The reciprocating refrigerant compressors are very suitable for
Options- A. small displacements and low condensing pressures
- B. large displacements and high condensing pressures
- C. small displacements and high condensing pressures
- D. large displacements and low condensing pressures Discuss
- 2. R-11 has the highest critical point temperature.
Options- A. Correct
- B. Incorrect Discuss
- 3. The space between the two walls of a thermos flask is evacuated because vacuum is a __________ conductor of heat.
Options- A. good
- B. bad Discuss
- 4. The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour in the same volume of saturated air at the same temperature and pressure, is called
Options- A. humidity ratio
- B. relative humidity
- C. absolute humidity
- D. degree of saturation Discuss
- 5. The cooling system used for supersonic aircrafts and rockets is
Options- A. simple air cooling system
- B. boot-strap air cooling system
- C. reduced ambient air cooling system
- D. regenerative air cooling system Discuss
- 6. In a pressure enthalpy chart, the space between the saturated liquid line and saturated vapour line, represents sub-cooled liquid region.
Options- A. True
- B. False Discuss
- 7. Air refrigerator works on
Options- A. reversed Carnot cycle
- B. Bell Coleman cycle
- C. both (a) and ib)
- D. none of these Discuss
- 8. Most thermostatic expansion valves are set for a superheat of
Options- A. 5°C
- B. 10°C
- C. 15°C
- D. 20°C Discuss
- 9. The boiling point of carbon dioxide is
Options- A. -20.5°C
- B. -50°C
- C. -63.3°C
- D. -78.3°C Discuss
- 10. The desirable property of a refrigerant is
Options- A. low boiling point
- B. high critical temperature
- C. high latent heat of vaporisation
- D. all of these Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: small displacements and high condensing pressures
Correct Answer: Correct
Correct Answer: bad
Correct Answer: relative humidity
Correct Answer: regenerative air cooling system
Correct Answer: False
Correct Answer: both (a) and ib)
Correct Answer: 5°C
Correct Answer: -78.3°C
Correct Answer: all of these
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