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The central air conditioning system has ________ overall efficiency as compared to individual systems.

A. Same

B. Lower

C. Higher

D. None of these

Correct Answer : C.


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  1. The optimum effective temperature for human comfort is
  2. The vapour compression refrigerator employs the following cycle
  3. The higher temperature in vapour compression cycle occurs at
  4. The advantage of dry compression is that
  5. Most thermostatic expansion valves are set for a superheat of
  6. The temperature of air recorded by a thermometer, when it is not affected by the moisture present in…
  7. A vapour absorption refrigerator uses __________ as a refrigerant.
  8. During heating and dehumidification process, dry bulb temperature
  9. The bypass factor, in case of sensible cooling of air, is given by (where td₁ = Dry bulb temperature…
  10. The process, generally used in winter air-conditioning to warm and humidity the air, is called
  11. The wet bulb temperature at 100% relative humidity is ________ dew point temperature.
  12. Which of the following refrigerants has lowest freezing point?
  13. A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine…
  14. In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at
  15. In a vapour compression system, the condition of refrigerant before entering the expansion or throttle…
  16. In mechanical refrigeration system, the refrigerant has the maximum temperature
  17. The comfort conditions in air conditioning are at (where DBT = Dry bulb temperature, and RH = Relative…
  18. The horizontal and non-uniformly spaced lines on a psychrometric chart indicates
  19. The heat rejection factor (HRF) is given by
  20. Cooling water is required for following equipment in ammonia absorption plant
  21. During cooling and dehumidification, dry bulb temperature
  22. An Electrolux refrigerator is called a __________ absorption system.
  23. In a reversed Brayton cycle, the heat is absorbed by the air during
  24. The vertical and uniformly spaced lines on a psychrometric chart indicates
  25. The mass of water vapour present in __________ is called absolute humidity.
  26. For unsaturated air, the dew point temperature is __________ wet bulb temperature.
  27. In a refrigeration cycle, the flow of refrigerant is controlled by
  28. The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C.…
  29. The specific humidity during heating and humidification process.
  30. Carbon dioxide is