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Engineering :: Refrigeration and Air conditioning

171.  When ammonia is used as a refrigerant in vapour compression cycle, the mass circulated per ton of refrigerating effect will be nearly
A. 0.2 kg B. 0.5 kg
C. 1 kg D. 1.2 kg
E. 1.8 kg    
172.  When Freon 12 is used as a refrigerant in vapour compression cycle, the mass circulated per ton of refrigerating effect will be nearly
A. 0.2 kg B. 0.5 kg
C. 1 kg D. 12 kg
E. 1.8 kg    
173.  The critical temperature for Freon 12 is
A. Less than - 50?C B. Around - 20?C
C. 0?C D. Around 50?C
E. Above 100?C    
174.  When Freon 12 is the refrigerant, the condenser and evaporator cables are made of
A. Steel B. Wrought iron
C. Cast iron D. Copper
E. Aluminium    
175.  PVC tubes are used for condenser and evaporator when the refrigerant is
A. Freon 12 B. Freon 22
C. Ammonia D. Sulphur dioxide
E. None of the above    
176.  In vapour absorption system using ammonia, water is required for
A. Condenser only B. Absorber only
C. Separator only D. Condenser and absorber
E. Condenser, absorber and separator    
177.  When ammonia is the refrigerant, which of the following will be be the material for pipe through which refrigerant flows?
A. Copper B. Aluminium
C. Brass D. PVC
E. Cast steel or wrought iron    
178.  The horse power per ton of refrigerating effect when ammonia is used as a refrigerant, will be nearly
A. 0.1 B. 0.5
C. 1 D. 2
E. 5    
179.  Which of the following is not a property of Carbondioxide?
A. Non-toxic B. Non-inflammable
C. Colourless D. Pungent odour
E. All of the above    
180.  Which of the following is not a desirable property of a refrigerant?
A. High critical temperature B. Low specific heat of liquid
C. Low boiling point D. High specific volume of air
E. All of the above    

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