Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
The lowest thermal diffusivity is of
Options- A. iron
- B. lead
- C. aluminium
- D. rubber
- Correct Answer
- rubber
- 1. Sulphur dioxide has the lowest boiling point.
Options- A. Yes
- B. No Discuss
- 2. A simple air cooling system is good for __________ flight speeds.
Options- A. low
- B. high Discuss
- 3. In a psychrometric chart, dew point temperature lines are horizontal and non-uniformly spaced.
Options- A. Correct
- B. Incorrect Discuss
- 4. During dehumidification process, __________ remains constant.
Options- A. wet bulb temperature
- B. relative humidity
- C. dry bulb temperature
- D. specific humidity Discuss
- 5. The highest temperature during the cycle in a vapour compression system occurs after evaporation.
Options- A. True
- B. False Discuss
- 6. The ratio of actual heat transfer to the maximum possible heat transfer is known as heat exchanger effectiveness.
Options- A. Agree
- B. Disagree Discuss
- 7. The unit of overall coefficient of heat transfer is
Options- A. W/m2K
- B. W/m2
- C. W/mK
- D. W/m Discuss
- 8. The mass of water vapour present in 1 kg of dry air, is called humidity ratio.
Options- A. True
- B. False Discuss
- 9. The refrigerant widely used in domestic refrigerators is
Options- A. ammonia
- B. carbon dioxide
- C. sulphur dioxide
- D. R-12 Discuss
- 10. R-12 is generally preferred over R-22 in deep freezers since
Options- A. it has low operating pressures
- B. it gives higher coefficient of performance
- C. it is miscible with oil over large range of temperatures
- D. all of the above Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: No
Correct Answer: low
Correct Answer: Correct
Correct Answer: dry bulb temperature
Correct Answer: False
Correct Answer: Agree
Correct Answer: W/m2K
Correct Answer: True
Correct Answer: R-12
Correct Answer: it is miscible with oil over large range of temperatures
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