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It is desired to condition the outside air from 70% relative humidity and 45° C dry bulb temperature to 50% relative humidity and 25° C dry bulb temperature (room condition). The practical arrangement will be

A. Dehumidification

B. Cooling and humidification

C. Cooling and dehumidification

D. Dehumidification and pure sensible cooling

Correct Answer : C.


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  1. A vapour absorption refrigerator uses __________ as a refrigerant.
  2. The condensing pressure due to the presence of non-condensable gases, as compared to that actually required…
  3. Allowable pressure on high pressure side or ammonia absorption system is of the order of
  4. The ratio of heat extracted in the refrigerator to the work-done on the refrigerant is called
  5. If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the…
  6. In a domestic refrigerator, a capillary tube controls the flow of refrigerant from the
  7. The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is
  8. One tonne of refrigeration (1TR) means that the heat removing capacity is
  9. During adiabatic saturation process on unsaturated air __________ remains constant.
  10. The relative humidity lines on a psychrometric chart are
  11. The leakage in a refrigeration system using ammonia is detected by
  12. During sensible cooling,
  13. In order to cool and dehumidify a stream of moist air, it must be passed over the coil at a temperature
  14. The Freon group of refrigerants are
  15. When the temperature of the surrounding is higher than the temperature of the body, then the heat loss…
  16. The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate…
  17. In aqua ammonia and Lithium bromide water absorption refrigeration systems, the refrigerants are respectively
  18. For unsaturated air, the dew point temperature is __________ wet bulb temperature.
  19. A one tonne refrigerating machine means that
  20. Moisture in Freon refrigeration system causes
  21. The refrigeration effect in a dry evaporator compared to flooded evaporator in a similar plant is
  22. One of the purposes of sub cooling the liquid refrigerant is to
  23. In chemical dehumidification process,
  24. In a refrigeration system, heat absorbed in comparison to heat rejected is
  25. One ton refrigeration corresponds to
  26. The human body feels comfortable when the heat stored in the body is
  27. In vapour compression cycle, the condition of refrigerant is very wet vapour
  28. The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature…
  29. The total pressure exerted by the mixture of air and water vapour is equal to the sum of pressures which…
  30. The pressure at the inlet of a refrigerant compressor is called