In larger industrial and commercial reciprocating compression systems, refrigerant widely used is

A. Ammonia

B. Carbon dioxide

C. Sulphur dioxide

D. R-12

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  1. A one tonne refrigerating machine means that
  2. Where does the lowest temperature occur in a vapour compression cycle?
  3. Formation of frost on evaporator in refrigerator
  4. The thermostatic expansion valve is also called
  5. The wet bulb temperature during sensible heating of air
  6. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is
  7. A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing…
  8. An Electrolux refrigerator is called a __________ absorption system.
  9. In vapour compression cycle the condition of refrigerant is superheated vapour
  10. The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute…
  11. The bypass factor, in case of sensible cooling of air, is given by (where td₁ = Dry bulb temperature…
  12. Efficiency of a Carnot engine is given as 80%. If the cycle direction be reversed, what will be the…
  13. In aqua ammonia absorption refrigeration system, incomplete rectification leads to accumulation of water…
  14. The condition of refrigerant after passing through the condenser in a vapour compression system is
  15. The curved lines on a psychrometric chart indicates
  16. A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking…
  17. The boiling point of ammonia is
  18. The capacity of a domestic refrigerator is in the range of
  19. The humidification process, on the psychrometric chart is shown by
  20. Air refrigeration cycle is used in
  21. When the air is passed through an insulated chamber having sprays of water maintained at a temperature…
  22. The difference between dry bulb temperature and wet bulb temperature, is called
  23. Nusselt number (NN) is given by
  24. The unit of thermal diffusivity is
  25. Carbon dioxide is
  26. Choose the wrong statement
  27. For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet…
  28. The temperature of air recorded by a thermometer, when it is not affected by the moisture present in…
  29. The operating temperature of a cold storage is 2°C. The heat leakage from the surrounding is 30…
  30. The boiling point of carbon dioxide is