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One tonne of refrigeration (1TR) means that the heat removing capacity is

A. 21 kJ/min

B. 210 kJ/min

C. 420 kJ/min

D. 620 kJ/min

Correct Answer : B.


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  1. Which of the following cycles uses air as the refrigerant?
  2. Which of the following refrigerants has lowest freezing point?
  3. The undesirable property of a refrigerant is
  4. In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the
  5. The moisture in a refrigerant is removed by
  6. Where does the lowest temperature occur in a vapour compression cycle?
  7. During heating and dehumidification process, dry bulb temperature
  8. The leaks in a refrigeration system using Freon are detected by
  9. The COP of a domestic refrigerator
  10. In actual air-conditioning applications for R-12 and R-22, and operating at a condenser temperature…
  11. Which of the following statement is correct?
  12. During sensible heating of air _________ decreases.
  13. Dry bulb temperature is the temperature of air recorded by a thermometer, when
  14. Which of the following refrigerant is highly toxic and flammable?
  15. The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature…
  16. The pressure at the outlet of a refrigerant compressor is called
  17. During a refrigeration cycle, heat is rejected by the refrigerant in a
  18. The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature…
  19. Rating of a domestic refrigerator is of the order of
  20. A refrigerant with the highest critical pressure is
  21. In a domestic vapour compression refrigerator, the refrigerant commonly used is
  22. The horizontal and non-uniformly spaced lines on a psychrometric chart indicates
  23. The boiling point of ________ is 10.5°C.
  24. The dry bulb temperature lines, on the psychrometric chart are
  25. The dry bulb temperature during sensible heating of air
  26. The refrigerant used in small tonnage commercial machines (hermetically sealed units) is
  27. Cooling water is required for following equipment in ammonia absorption plant
  28. The operating temperature of a cold storage is 2°C. The heat leakage from the surrounding is 30…
  29. Vertical lines on pressure-enthalpy chart show constant
  30. Carbon dioxide is