Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
A simple air cooling system is good for __________ flight speeds.
Options- A. low
- B. high
- Correct Answer
- low
- 1. In a psychrometric chart, dew point temperature lines are horizontal and non-uniformly spaced.
Options- A. Correct
- B. Incorrect Discuss
- 2. During dehumidification process, __________ remains constant.
Options- A. wet bulb temperature
- B. relative humidity
- C. dry bulb temperature
- D. specific humidity Discuss
- 3. The highest temperature during the cycle in a vapour compression system occurs after evaporation.
Options- A. True
- B. False Discuss
- 4. In chemical dehumidification process,
Options- A. dew point temperature decreases
- B. wet bulb temperature decreases
- C. dry bulb temperature increases
- D. all of these Discuss
- 5. A refrigerating system operating on reversed Brayton refrigeration cycle is used for maintaining 250 K. If the temperature at the end of constant pressure cooling is 300 K and rise in the temperature of air in the refrigerator is 50 K, then the net work of compression will be (assume air as working substance with cp = 1 kJ/kg)
Options- A. 25 kJ/kg
- B. 50 kJ/kg
- C. l00 kJ/kg
- D. 125 kJ/kg Discuss
- 6. Sulphur dioxide has the lowest boiling point.
Options- A. Yes
- B. No Discuss
- 7. The lowest thermal diffusivity is of
Options- A. iron
- B. lead
- C. aluminium
- D. rubber Discuss
- 8. The ratio of actual heat transfer to the maximum possible heat transfer is known as heat exchanger effectiveness.
Options- A. Agree
- B. Disagree Discuss
- 9. The unit of overall coefficient of heat transfer is
Options- A. W/m2K
- B. W/m2
- C. W/mK
- D. W/m Discuss
- 10. The mass of water vapour present in 1 kg of dry air, is called humidity ratio.
Options- A. True
- B. False Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: Correct
Correct Answer: dry bulb temperature
Correct Answer: False
Correct Answer: all of these
Correct Answer: 50 kJ/kg
Correct Answer: No
Correct Answer: rubber
Correct Answer: Agree
Correct Answer: W/m2K
Correct Answer: True
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