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For air conditioning the operation theatre in a hospital, the percentage of outside air in the air supplied is

A. Zero

B. 20

C. 50

D. 100

Correct Answer : D.


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  1. During humidification process, __________ increases.
  2. The leakage in a refrigeration system using ammonia is detected by
  3. The condition of refrigerant after passing through the condenser in a vapour compression system is
  4. A valve which maintains a constant degree of superheat at the end of the evaporator coil, is called
  5. Which of the following refrigerant has the highest freezing point.
  6. The wet bulb depression indicates _________ humidity of the air.
  7. In larger industrial and commercial reciprocating compression systems, refrigerant widely used is
  8. Vertical lines on pressure-enthalpy chart show constant
  9. The bypass factor (B. P. F.) in case of sensible heating of air is (Where td₁ = Dry bulb temperature…
  10. One ton of the refrigeration is
  11. The difference between dry bulb temperature and dew point temperature, is called
  12. During heating and dehumidification process, dry bulb temperature
  13. Where does the lowest temperature occur in a vapour compression cycle?
  14. The COP of a domestic refrigerator
  15. The superheated vapour region, in a pressure enthalpy chart, is represented by the space
  16. During a refrigeration cycle, heat is rejected by the refrigerant in a
  17. In mechanical refrigeration system, the refrigerant has the maximum temperature
  18. One ton of refrigeration is equal to the refrigeration effect corresponding to melting of 1000 kg of…
  19. The conditioned air supplied to the room must have the capacity to take up
  20. For unsaturated air, the dew point temperature is __________ wet bulb temperature.
  21. Under cooling in a refrigeration cycle
  22. In a psychrometric process, the sensible heat added is 30 kJ/s and the latent heat added is 20 kJ/s.…
  23. In a psychrometric chart, specific humidity (moisture content) lines are
  24. Which of the following is not a desirable property of a refrigerant?
  25. Air refrigerator works on
  26. The refrigerant for a refrigerator should have
  27. In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at
  28. The C.O.P of a refrigeration cycle with increase in evaporator temperature, keeping condenser temperature…
  29. In a pressure enthalpy chart, the space to the left of the saturated liquid line represents
  30. The suction pipe diameter of refrigerating unit compressor in comparison to delivery side is