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Engineering :: Refrigeration and Air conditioning

131.  In a small vapour compression cycle using capillary tubing for expansion, if suddenly uncondensed vapours enter the tubing, the result will be
A. Improved refrigerating capacity B. Loss in refrigerating capacity
C. Supply of superheated vapour to compressor D. Choking of drier
E. All of the above    
132.  In which of the following plants secondary refrigerant is used?
A. Domestic refrigerator B. Room air conditioner
C. Deep freezer D. Ice plant
E. None of the above    
133.  The secondary refrigerant used in milk chilling plants is usually
A. Brine B. Ammonia solution
C. Glycol D. Sodium silicate
E. Any of the above    
134.  If the condensation temperature of a refrigerant is 25?C which type of condenser cannot be used?
A. Air cooled condenser B. Water cooled condenser
C. Brine circulation condenser D. Ice cooled condenser
135.  Which type of compressor is commonly used in room air-conditioner
A. Reciprocating B. Rotory
C. Screw D. Centrifugal
E. None of the above    
136.  A refrigerant cycle is usually a
A. Open cycle B. Closed cycle
C. Mixed cycle D. Hybrid cycle
137.  Refrigerant No. 717 is
A. Ammonia B. Freon 12
C. Freon 22 D. Methyl chloride
E. Carbondioxide    
138.  Water is used as a refrigerant in
A. Vapour absorption cycle B. Steam jet refrigeration
C. Vapour absorption cycle D. Cascade system
E. None of the above    
139.  Class II group of refrigerants absorb sensible heat while giving refrigeration effect. Which of the following is a class II refrigerant
A. Ammonia B. Carbondioxide
C. Freon 12 D. Methyl chloride
E. All of the above    
140.  Which of the following is not a dehydrator?
A. Silica sel B. Molecular sieve
C. Calcium chloride D. Sodium chloride
E. All of the above    

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