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A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

A. 1.33

B. 2.33

C. 3.33

D. 4.33

Correct Answer : B.


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  1. A mixture of dry air and water vapour, when the air has diffused the maximum amount of water vapour…
  2. The thermostatic expansion valve is also called
  3. The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression…
  4. The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature…
  5. When the temperature of the surrounding is higher than the temperature of the body, then the heat loss…
  6. Which of the following is not a desirable property of a refrigerant?
  7. A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes…
  8. One of the purposes of sub cooling the liquid refrigerant is to
  9. The COP of a domestic refrigerator
  10. In vapour compression refrigeration system, refrigerant occurs as liquid between
  11. The bypass factor, in case of sensible cooling of air, is given by (where td₁ = Dry bulb temperature…
  12. The operating temperature of a cold storage is 2°C. The heat leakage from the surrounding is 30…
  13. In case of sensible heating of air, the coil efficiency is given by (where B.P.F. = Bypass factor)
  14. In a reversed Brayton cycle, the heat is absorbed by the air during
  15. During sensible cooling of air, specific humidity
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  17. Condensing temperature in a refrigerator is the temperature
  18. Relative humidity is given by (where pv = Partial pressure of water vapour, pb = Barometric pressure,…
  19. In a vapour compression system, the condition of refrigerant is dry saturated vapour
  20. In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s.…
  21. In vapour compression cycle the condition of refrigerant is superheated vapour
  22. The index which correlates the combined effects of air temperature, relative humidity and air velocity…
  23. The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called
  24. For unsaturated air, the dew point temperature is __________ wet bulb temperature.
  25. During a refrigeration cycle, heat is rejected by the refrigerant in a
  26. The humidity ratio or specific humidity is the mass of water vapour present in
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  28. A bootstrap air cooling system has
  29. The unit of thermal diffusivity is
  30. A human body feels comfortable when the heat produced by the metabolism of human body is equal to the