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In a domestic vapour compression refrigerator, the refrigerant commonly used is

A. CO₂

B. Ammonia

C. R-12

D. All of these

Correct Answer : C.


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  1. Which of the following refrigerant has the highest freezing point.
  2. In vapour compression cycle, the condition of refrigerant is very wet vapour
  3. In a bootstrap air evaporative cooling system, the evaporator is provided
  4. During a refrigeration cycle, heat is rejected by the refrigerant in a
  5. A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine…
  6. Freon group of refrigerants are
  7. The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression…
  8. The wet bulb temperature at 100% relative humidity is ________ dry bulb temperature.
  9. The refrigerant after condensation process is cooled below the saturation temperature before throttling.…
  10. The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate…
  11. Pick up the wrong statement. A refrigerant should have
  12. The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture…
  13. During heating and humidification, the final relative humidity of air
  14. The specific humidity during dehumidification process
  15. During sensible cooling of air ________ decreases.
  16. Moisture in Freon refrigeration system causes
  17. In a vapour compression system, the condition of refrigerant before passing through the condenser is
  18. During dehumidification process, the relative humidity
  19. The leakage in a refrigeration system using Freon is detected by
  20. In chemical dehumidification process,
  21. In a pressure enthalpy chart, the space to the left of the saturated liquid line represents
  22. In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature…
  23. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is
  24. Absorption system normally uses the following refrigerant
  25. In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water…
  26. Critical pressure of a liquid is the pressure
  27. Highest pressure encountered in a refrigeration system should be
  28. The minimum temperature to which water can be cooled in a cooling tower is
  29. In a refrigerating machine, heat rejected is _________ heat absorbed.
  30. The Freon group of refrigerants are