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When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance can be improved by

A. Operating the machine at higher speeds

B. Operating the machine at lower speeds

C. Raising the higher temperature

D. Lowering the higher temperature

Correct Answer : D.


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  2. The undesirable property of a refrigerant is
  3. In S.J. unit, one ton of refrigeration is equal to
  4. Where does the lowest temperature occur in a vapour compression cycle?
  5. An important characteristic of absorption system of refrigeration is
  6. Degree of saturation or percentage humidity is
  7. The superheating in a refrigeration cycle
  8. The advantage of dry compression is that
  9. The human body feels comfortable when the heat stored in the body is
  10. Formation of frost on evaporator in refrigerator
  11. A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking…
  12. The wet bulb temperature at 100% relative humidity is ________ dry bulb temperature.
  13. During adiabatic saturation process on unsaturated air __________ remains constant.
  14. Allowable pressure on high pressure side or ammonia absorption system is of the order of
  15. The dehumidification process, on the psychrometric chart, is shown by
  16. The dry bulb temperature during sensible heating of air
  17. Cooling water is required for following equipment in ammonia absorption plant
  18. Mass flow ratio of NH₃ in comparison to Freon12 for same refrigeration load and same temperature…
  19. A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called
  20. Dry bulb temperature is the temperature of air recorded by a thermometer, when
  21. Which of the following statement is correct?
  22. The boiling point of carbon dioxide is
  23. In a refrigeration cycle, the flow of refrigerant is controlled by
  24. In a bootstrap air evaporative cooling system, the evaporator is provided
  25. When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance…
  26. Most of the domestic refrigerators work on the following refrigeration system
  27. The material of pipe lines for a system using Freon as a refrigerant should be
  28. A bootstrap air cooling system has
  29. Domestic refrigerator working on vapour compression cycle uses the following type of expansion device
  30. The conditioned air supplied to the room must have the capacity to take up