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Which of the following refrigerants has lowest freezing point?

A. Freon-12

B. NH3

C. CO2

D. Freon-22

Correct Answer : D.


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  2. If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature…
  3. When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance…
  4. The capillary tube, as an expansion device, is used in
  5. The boiling point of ________ is 10.5°C.
  6. In vapour compression cycle, the condition of refrigerant is saturated liquid
  7. In vapour compression cycle the condition off refrigerant is dry saturated vapour
  8. Air refrigeration cycle is used in
  9. The higher temperature in vapour compression cycle occurs at
  10. A vapour absorption refrigerator uses __________ as a refrigerant.
  11. In a vapour compression system, the condition of refrigerant before passing through the condenser is
  12. Domestic refrigerator working on vapour compression cycle uses the following type of expansion device
  13. The thermal diffusivity for gases is generally __________ those for liquids.
  14. For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet…
  15. Pick up the wrong statement. A refrigerant should have
  16. Pressure of water vapour is given by
  17. Cooling water is required for following equipment in ammonia absorption plant
  18. The process, generally used in winter air-conditioning to warm and humidity the air, is called
  19. Air conditioning means
  20. The human body feels comfortable when the heat stored in the body is
  21. Absorption system normally uses the following refrigerant
  22. A refrigerant compressor is used to
  23. A refrigeration system
  24. The vapour pressure of refrigerant should be
  25. Dry bulb temperature is the temperature of air recorded by a thermometer, when
  26. The wet bulb temperature during sensible cooling of air
  27. Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the…
  28. The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C.…
  29. Ammonia is
  30. The evaporator changes the low pressure liquid refrigerant from the expansion valve into