Engineering :: Refrigeration and Air conditioning

31.  Defrosting in a refrigerator may be done by
A. Stopping the compressor for a while B. Opening the door of refrigerator
C. Placing trays of warm water in the refrigerator D. Any of the above
E. None of the above    

32.  A thermometer installed, in a vapour compression ammonia system, after the condenser shows elevated reading than the normal. It shows that
A. Condenser needs cleaning B. Cooling tower or spray pond not handling the load properly
C. Uneven water distribution over the condensing surfaces D. Any of the above
E. None of the above    

33.  In ammonia vapour compression system the temperature rise between the condenser outlet and the expansion valve should be
A. As high as possible to improve the performance B. As high as possible to reduce motor power inputs
C. As little as possible for better performance D. Anything as it has no bearing on the performance of system
E. None of the above    

34.  In a vapour compression refrigeration cycle using ammonia as a refrigerant the temperature of ammonia after compression will be at the range
A. ? 15?C to - 40?C B. 0?C to - 15?C
C. 40?C to 0?C D. 50?C to 40?C
E. 70?C to - 110?C    

35.  In a vapour compression cycle the lowest temperature occurs in
A. Compressor B. Expansion valve
C. Condenser D. Receiver
E. Evaporator    

36.  The most common type of vapour absorption system in use for industrial application is
A. Freon 12 and water B. Freon 22 and water
C. Ammonia and water D. Brine and water
E. Hydrogen and water    

37.  In a vapour absorption system as compared to vapour compression system, the compressor is replaced by
A. Evaporator B. Receiver
C. Expansion valve D. Conderser
E. Absorber and generator    

38.  The moisture in a refrigeration system is removed by
A. Driers B. Dehumidifiers
C. Evaporators D. Coolers
E. None of the above    

39.  A refrigerant with lowest freezing point temperature is
A. Freon 11 B. Freon 12
C. Freon 22 D. Ammonia
E. Carbondioxide    

40.  The condition of refrigerant before and after compression in vapour compression cycle is
A. Wet vapour, cry saturated vapour B. Liquid, wet vapour
C. Dry saturated vapour, superheated vapour D. Dry saturated vapour, liquid
E. Wet vapour, wet vapour    

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