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R-12 is generally preferred over R-22 in deep freezers since

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

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  1. The optimum effective temperature for human comfort is
  2. Most of the domestic refrigerators work on the following refrigeration system
  3. The C.O.P. of a heat pump working on a reversed Carnot cycle is
  4. The wet bulb temperature during sensible heating of air
  5. In which of the following refrigeration system, waste heat can be effectively used?
  6. The C.O.P. of an absorption type refrigerator is given by (where T₁ = Temperature at which the…
  7. A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called
  8. The lowest thermal diffusivity is of
  9. Dry bulb temperature is the temperature of air recorded by a thermometer, when
  10. The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called
  11. The coefficient of performance of a domestic refrigerator is ________ as compared to a domestic air-conditioner.
  12. The unit of thermal diffusivity is
  13. Reducing suction pressure in refrigeration cycle
  14. In a vapour compression system, the condition of refrigerant before passing through the condenser is
  15. The leakage in a refrigeration system using Freon is detected by
  16. The desirable property of a refrigerant is
  17. In Electrolux refrigerator
  18. In a domestic vapour compression refrigerator, the refrigerant commonly used is
  19. In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at
  20. The emissivity of a polished silver body is __________ as compared to black body.
  21. Which of the following is not a desirable property of a refrigerant?
  22. Bell Coleman cycle is a
  23. The higher temperature in vapour compression cycle occurs at
  24. The sensible heat factor during the heating and humidification process is given by (where h₁…
  25. The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is
  26. In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the
  27. For ammonia refrigerating systems, the tubes of a shell and tube condenser are made of
  28. The refrigerant supplied to a compressor must be
  29. The evaporator used in household refrigerators is
  30. In a refrigerating machine, heat rejected is _________ heat absorbed.