Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
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
- Correct Answer
- small displacements and high condensing pressures
- 1. R-11 has the highest critical point temperature.
Options- A. Correct
- B. Incorrect Discuss
- 2. 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
- 3. 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
- 4. 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
- 5. Which of the following statement is correct?
Options- A. In vapour absorption refrigerator, the compression of refrigerent is avoided.
- B. Sub-cooling can be achieved by circulating more quantity of cooling water through the condenser.
- C. In vapour compression refrigeration, the vapour is drawn in the compressor cylinder during its suction stroke and is compressed adiabatically during the compression stroke.
- D. all of the above Discuss
- 6. 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 Discuss
- 7. 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
- 8. Air refrigerator works on
Options- A. reversed Carnot cycle
- B. Bell Coleman cycle
- C. both (a) and ib)
- D. none of these Discuss
- 9. Most thermostatic expansion valves are set for a superheat of
Options- A. 5°C
- B. 10°C
- C. 15°C
- D. 20°C Discuss
- 10. The boiling point of carbon dioxide is
Options- A. -20.5°C
- B. -50°C
- C. -63.3°C
- D. -78.3°C Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: Correct
Correct Answer: bad
Correct Answer: relative humidity
Correct Answer: regenerative air cooling system
Correct Answer: all of the above
Correct Answer:
Correct Answer: False
Correct Answer: both (a) and ib)
Correct Answer: 5°C
Correct Answer: -78.3°C
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