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Which of the following refrigerant has the lowest boiling point?

A. Ammonia

B. Carbon dioxide

C. Sulphur dioxide

D. R-12

Correct Answer : B.


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  1. The wet bulb temperature during sensible cooling of air
  2. The undesirable property of a refrigerant is
  3. A refrigeration system
  4. The lowest thermal diffusivity is of
  5. On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line…
  6. The specific humidity during cooling and dehumidification
  7. Where does the lowest temperature occur in a vapour compression cycle?
  8. Superheating in a refrigeration cycle
  9. The relative coefficient of performance is
  10. The wet bulb temperature during sensible heating of air
  11. While designing the refrigeration system of an aircraft, the prime consideration is that the
  12. The refrigerant used in small tonnage commercial machines (hermetically sealed units) is
  13. The centrifugal compressors are generally used for refrigerants that require
  14. In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at
  15. The wet bulb temperature at 100% relative humidity is ________ dry bulb temperature.
  16. The ratio of the actual mass of water vapour in a unit mass of dry air to the mass of water vapour in…
  17. During sensible cooling of air, specific humidity
  18. The value of C.O.P in vapour compression cycle is usually
  19. The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative…
  20. The thermostatic expansion valve operates on the changes in the
  21. The reciprocating refrigerant compressors are very suitable for
  22. The dry bulb temperature lines, on the psychrometric chart are
  23. Which of the following statement is wrong?
  24. In refrigerator, liquid receiver is required between condenser and flow controlling device, if quantity…
  25. In vapour compression refrigeration system, refrigerant occurs as liquid between
  26. The superheated vapour region, in a pressure enthalpy chart, is represented by the space
  27. The coefficient of performance of a domestic refrigerator is ________ as compared to a domestic air-conditioner.
  28. Air refrigeration operates on
  29. The emissivity of a polished silver body is __________ as compared to black body.
  30. The coefficient of performance of Electrolux refrigerator is the ratio of