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Refrigeration and Air Conditioning - Interview Questions and Answers

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51. For proper refrigeration in a cabinet, if the temperature and vapour pressure difference between cabinet and atmosphere is high, then
A. bigger cabinet should be used
B. smaller cabinet should be used
C. perfectly tight vapour seal should be used
D. refrigerant with lower evaporation temperature should be used
E. refrigerant with high boiling point must be used.
Explanation:
52. 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.
Explanation:
53. 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.
Explanation:
54. The lower horizontal line of the refrigeration cycle plotted on pressure-enthalpy-diagram represents
A. condensation of the refrigerant vapour
B. evaporation of the refrigerant liquid
C. compression of the refrigerant vapour
D. metering of the refrigerant liquid
E. none of the above.
Explanation:
55. Freon group of refrigerants are
A. inflammable
B. toxic
C. non-inflammable and toxic
D. non-toxic and inflammable
E. non-toxic and non-inflammable.
Explanation:
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