Hiried Refrigeration and Air Conditioning - Mechanical Engineering Multiple choice Questions and Answers pdf

51.    A refrigeration cycle operates between condenser temperature of + 27°C and evaporator temperature of- 23°C. The Cannot coefficient of performance of cycle will be
(a)    0.2 
(b)    1.2
(c)    5 
(d)    6
(e)    10.
Ans: c

52.    Which of the following is not a desirable property of a refrigerant
(a)    high triiscibility with oil
(b)    low boiling point
(c)    good electrical conductor
(d)    large latent heat
(e)    non-inflammable.
Ans: c

53.    In vapour compression refrigeration system, refrigerant occurs as liquid between
(a)    condenser and expansion valve
(b)    compressor and evaporator
(c)    expansion valve and evaporator
(d)    compressor and condenser
(e)    none of the above.
Ans: c

54.    Pick up the correct statement about giving up of heat from one medium to other in ammonia absorption system
(a)    strong solution to weak solution
(b)    weak solution to strong solution
(c)    strong solution to ammonia vapour
(d)    ammonia vapour to weak solution
(e)    ammonia vapour to strong solution.
Ans: b

55.    Efficiency of a Cornot engine is given as 80%. If the- cycle direction be reversed, what will be the value of COP of reversed Carnot cycle
(a)     1.25 
(b)     0.8
(c)     0.5 
(d)     0.25
(e)     none of the above.
Ans: d

56.    Highest pressure encountered in a refrigeration system should be
(a)    critical pressure of refrigerant
(b)    much below critical pressure
(c)    much above critical pressure
(d)    near critical pressure
(e)     there is no such restriction.
Ans: b

57. If a heat pump cycle operates between the condenser temperature  of +27°C and evaporator temperature of - 23°C, then the Carnot COP will be
(a)    0.2 
(b)    1.2
(c)    5 
(d)    6
(e)    10.
Ans: d

58.    A certain refrigerating system has a normal operating suction pressure of 10 kg/cm gauge and condensing pressure of about 67 kg/cm. The refrigerant used is
(a)     Ammonia 
(b)     Carbon dioxide
(c)     Freon 
(d)     Brine
(e)    Hydrocarbon refrigerant.
Ans: b

59.    Aqua ammonia is used as refrigerant in the following type of refrigeration system
(a)     compression  
(b)     direct
(c)     indirect 
(d)     absorption
(e)     none of the above.
Ans: d

60.    If the evaporator temperature of a plant is lowered, keeping the condenser temperature constant, the h.p. of compressor required will be
(a)     same 
(b)     more
(c)    less
(d)    more/less depending on rating
(e)    unpredictable.
Ans: b

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