Realtime Refrigeration and Air Conditioning Engineering Multiple choice Questions and Answers pdf

21.    The moisture in a refrigerant is removed by
(a)     evaporator     
(b)     safety relief valve
(c)     dehumidifier 
(d)     driers
(e)     expansion valve
Ans: d

22.    The condensing pressure due to the presence of non condemnable gases, as compared to that actually required for condensing temperatures without non condemnable gases,
(a)     will be higher
(b)     will be lower
(c)    will remain unaffected
(d)    may be higher or lower depending upon the nature of non condemnable gases
(e)    unpredictable.
Ans: a

23.    Critical pressure of a liquid is the pressure
(a)    above which liquid will remain liquid
(b)    above which liquid becomes gas
(c)    above which liquid becomes vapour
(d)    above which liquid becomes solid
(e)    at which all the three phases  exist together.
Ans: a

24.    Critical temperature is' the temperature above which
(a)     a gas will never liquefy
(b)     a gas will immediately liquefy
(c)    water will evaporate
(d)    water will never evaporate
(e)     none of the above.
Ans: a

25.    The refrigerant for a refrigerator should have
(a)     high sensible heat
(b)     high total heat
(c)     high latent heat
(d)     low latent heat
(e)     low sensible heat
Ans: c

26.    Rating of a domestic refrigerator is of the order of
(a)    0.1 ton 
(b)    5 tons
(c)    10 tons 
(d)    40 tons
(e)    100 tons.
Ans: a

27.    The COP of a domestic refrigerator
(a)    is less than 1
(b)    is more than 1
(c)    is equal to 1
(d)    depends upon the make
(e)    depends upon the weather conditions.
Ans: b

28.    The domestic refrigerator uses following type of compressor
(a)     centrifugal     
(b)     axial
(c)    miniature sealed unit
(d)    piston type reciprocating
(e)    none of the above.
Ans: d

29.    Presence of moisture in a refrigerant affects the working of
(a)     compressor    
(b)     condenser
(c)     evaparator    
(d)     expansion valve.
(e)     heat transfer.
Ans: d

30.    Refrigeration in aeroplanes usually employs the following refrigerant
(a)     C02 
(b)     Freon-11
(c)     Freon-22 
(d)     Air
(e)     none of the above.
Ans: d

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