Engineering :: Refrigeration and Air conditioning

21.  Oil separator in a refrigeration cycle is installed
A. Before compressor B. Between compressor and condenser
C. Between condenser and evaporator D. Between condenser and expansion vlve
E. Could be installed anywhere    

22.  The leaks of refrigerant from a cycle may be detected by
A. Halide torch test B. Sulphur candle test
C. Soap and water test D. Any of above
E. None of the above    

23.  In halide torch test if there is leakage of refrigerant, the colour of flame with change to
A. Yellow B. Red or pink
C. Violet or orange D. Black or grey
E. Blue or bright green    

24.  Moisture in Freon refrigeration system causes
A. Ineffective refrigeration B. Damage to compressor
C. High power consumption D. Freezing of automatic regulating valve
E. None of the above    

25.  In a refrigerator system if compressor fails to operate, the probable reason could be
A. Power failure B. Low voltage
C. Burnt motor D. Fuse blown
E. Any of the above    

26.  In a refrigeration system, if the compressor short cycles, the probable cause could be
A. Intermittent contact in electric control circuit B. Dirty or iced evaporator
C. Lack of refrigerant D. Overchange of refrigerant
E. Any of the above    

27.  The condition of refrigerant before and after the condenser in a vapour compression cycle is
A. Dry saturated, saturated liquid B. Dry saturated, wet vapour
C. Dry saturated, dry saturated D. Wet vapour, wet vapour
E. Liquid, liquid    

28.  In electrolus refrigerator
A. Ammonia is absorbed in water B. Ammonia is absorbed in hydrogen
C. Hydrogen is absorbed in water D. Ammonia evaporates in hydrogen
E. Hydrogen evaporates in ammonia    

29.  In case of freon as refrigerant the pipe lines should be of
A. Copper B. Brass
C. Seamless steel tubes D. Stainless steel tubes
E. None of the above    

30.  Frost on cooling coils
A. Increases heat transfer B. Improves COP of the system
C. Reduces power consumption D. Reduces evaporator temperature
E. Acts as an insulation, increasing power consumption    

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