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The boiling point of ________ is 10.5°C.

A. Ammonia

B. R-12

C. Sulphur dioxide

D. Carbon dioxide

Correct Answer : C.


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  1. At lower temperatures and pressures, the latent heat of vaporisation of a refrigerant
  2. The power per tonne of refrigeration is
  3. The ratio of actual mass of water vapour in a given volume of moist air to the mass of water vapour…
  4. Which of the following refrigerant has the lowest freezing point?
  5. A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called
  6. In a refrigeration system, the expansion device is connected between the
  7. In a vapour compression system, the condition of refrigerant before entering the expansion or throttle…
  8. One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of…
  9. Which of the following refrigerant has the maximum ozone depletion potential in the stratosphere?
  10. Critical temperature is the temperature above which
  11. The fluids used in Electrolux refrigerator are
  12. Most thermostatic expansion valves are set for a superheat of
  13. Where does the lowest temperature occur in a vapour compression cycle?
  14. The emissivity of a polished silver body is __________ as compared to black body.
  15. The refrigerant used in small tonnage commercial machines (hermetically sealed units) is
  16. In a spray washing system, if the temperature of water is higher than the dry bulb temperature of entering…
  17. The thermal diffusivity for gases is generally __________ those for liquids.
  18. The evaporator used in household refrigerators is
  19. The relative humidity lines on a psychrometric chart are
  20. A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature…
  21. The formation of frost on cooling coils in a refrigerator
  22. The lowest thermal diffusivity is of
  23. The boiling point of carbon dioxide is
  24. A thermostatic expansion valve in a refrigeration system
  25. In a vapour compression system, the condition of refrigerant is dry saturated vapour
  26. A condenser of refrigeration system rejects heat at the rate of 120 kW, while its compressor consumes…
  27. The bypass factor for a cooling coil
  28. For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet…
  29. The coefficient of performance is the ratio of the refrigerant effect to the
  30. Hydrogen is used in Electrolux refrigeration system so as to _________ the rate of evaporation of the…