Discussion
Home ‣ Mechanical Engineering ‣ Heat Transfer, Refrigeration and Air Conditioning Comments
- Question
The ratio of heat extracted in the refrigerator to the workdone on the refrigerant is called
Options- A. coefficient of performance of refrigeration
- B. coefficient of performance of heat pump
- C. relative coefficient of performance
- D. refrigerating efficiency
- Correct Answer
- coefficient of performance of refrigeration
- 1. The humidification process, on the psychrometric chart is shown by
Options- A. horizontal line
- B. vertical line
- C. inclined line
- D. curved line Discuss
- 2. 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
- 3. The boiling point of carbon dioxide is
Options- A. -20.5°C
- B. -50°C
- C. -63.3°C
- D. -78.3°C Discuss
- 4. Most thermostatic expansion valves are set for a superheat of
Options- A. 5°C
- B. 10°C
- C. 15°C
- D. 20°C Discuss
- 5. Air refrigerator works on
Options- A. reversed Carnot cycle
- B. Bell Coleman cycle
- C. both (a) and ib)
- D. none of these Discuss
- 6. During dehumidification process, the relative humidity
Options- A. remains constant
- B. increases
- C. decreases Discuss
- 7. The evaporator changes the low pressure liquid refrigerant from the expansion valve into
Options- A. high pressure liquid refrigerant
- B. low pressure liquid and vapour refrigerant
- C. low pressure vapour refrigerant
- D. none of these Discuss
- 8. When absorptivity (?) = 1, reflectivity (?) = 0 and transmittivity (?) = 0, then the body is said to be a
Options- A. black body
- B. grey body
- C. opaque body
- D. white body Discuss
- 9. The mass of water vapour present in __________ is called absolute humidity.
Options- A. 1 m3 of wetair
- B. 1 m3 of dry air
- C. 1 kg of wet air
- D. 1 kg of dry air Discuss
- 10. During sub-cooling, sensible heat from a liquid refrigerant is removed.
Options- A. Yes
- B. No Discuss
Heat Transfer, Refrigeration and Air Conditioning problems
Search Results
Correct Answer: vertical line
Correct Answer: all of these
Correct Answer: -78.3°C
Correct Answer: 5°C
Correct Answer: both (a) and ib)
Correct Answer: decreases
Correct Answer: low pressure vapour refrigerant
Correct Answer: black body
Correct Answer: 1 m3 of dry air
Correct Answer: Yes
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