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Which of the following refrigerant is highly toxic and flammable?

A. Ammonia

B. Carbon dioxide

C. Sulphur dioxide

D. R-12

Correct Answer : A.


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  1. The thermostatic expansion valve is used in __________ type of evaporators.
  2. Which of the following refrigerant is highly toxic and flammable?
  3. Short horizontal lines on pressure-enthalpy chart show
  4. Absorption system normally uses the following refrigerant
  5. The process, generally used in summer air conditioning to cool and dehumidify the air, is called
  6. If a gas is to be liquefied, its temperature must be
  7. Rating of a domestic refrigerator is of the order of
  8. The higher temperature in vapour compression cycle occurs at
  9. In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s.…
  10. Ammonia absorption refrigeration cycle requires
  11. The specific humidity during dehumidification process
  12. One ton of the refrigeration is
  13. Choose the correct statement
  14. The relative coefficient of performance is equal to
  15. The boiling point of ammonia is
  16. The lowest temperature during the cycle in a vapour compression system occurs after
  17. The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate…
  18. The COP of a domestic refrigerator
  19. In a vapour compression system, the condition of refrigerant is dry saturated vapour
  20. The refrigerant used for absorption refrigerators working on heat from solar collectors is a mixture…
  21. In a bootstrap air evaporative cooling system, the evaporator is provided
  22. Chaperon equation is applicable for registration at
  23. The wet bulb depression indicates _________ humidity of the air.
  24. When the temperature of the surrounding is higher than the temperature of the body, then the heat loss…
  25. The formation of frost on cooling coils in a refrigerator
  26. While designing the refrigeration system of an aircraft, the prime consideration is that the
  27. The bypass factor of a cooling coil decreases with
  28. Critical temperature is the temperature above which
  29. Which of the following statement is correct?
  30. The condition of refrigerant after passing through the condenser in a vapour compression system is