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Environmental protection agencies advice against the use of chlorofluorocarbon refrigerants since

A. These react with water vapour and cause acid rain

B. These react with plants and cause greenhouse effect

C. These react with oxygen and cause its depletion

D. These react with ozone layer

Correct Answer : D.


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  1. In which of the following refrigeration system, waste heat can be effectively used?
  2. During humidification process, dry bulb temperature
  3. Which of the following statement is correct?
  4. The sensible heat factor during cooling and dehumidification process is given by (where h₁ =…
  5. In a psychrometric chart, specific humidity (moisture content) lines are
  6. The refrigerant supplied to a compressor must be
  7. The alignment circle is marked on the psychrometric chart at
  8. Which of the following statement is wrong?
  9. The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is
  10. When the lower temperature of a refrigerating machine is fixed, then the coefficient of performance…
  11. Which of the following refrigerant has the maximum ozone depletion potential in the stratosphere?
  12. Highest temperature encountered in refrigeration cycle should be
  13. Most of the domestic refrigerators work on the following refrigeration system
  14. Pick up the wrong statement. A refrigerant should have
  15. The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called
  16. In a reversed Brayton cycle, the heat is absorbed by the air during
  17. The refrigerant widely used in domestic refrigerators is
  18. The humidity ratio or specific humidity is the mass of water vapour present in
  19. The central air conditioning system has ________ overall efficiency as compared to individual systems.
  20. A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine…
  21. The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy diagram represents
  22. The leakage in a refrigeration system using Freon is detected by
  23. Bell Coleman cycle is a
  24. The boiling point of ammonia is
  25. The thermostatic expansion valve operates on the changes in the
  26. The value of C.O.P in vapour compression cycle is usually
  27. The mass of water vapour present in __________ is called absolute humidity.
  28. The cooling system used for supersonic aircrafts and rockets is
  29. A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking…
  30. A refrigeration system