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Refrigeration and Air Conditioning - Interview Questions and Answers

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81. The coefficient of performance is the ratio of the refrigerant effect to the
A. heat of compression
B. work done by compressor
C. enthalpy increase in compressor
D. all of the above
E. none of the above.
Explanation:
82. Under-cooling in a refrigeration cycle
A. increases COP
B. decreases COF
C. COP remains unaltered
D. other factors decide COP
E. unperdictable.
Explanation:
83. Choose the wrong statement
A. Temperature of medium being cooled must be below that of the evaporator
B. Refrigerant leaves the condenser as liquid
C. All solar thermally operated absorption systems are capable only of intermittent operation
D. frost on evaporator reduces heat transfer
E. refrigerant is circulated in a refrigeration system to transfer heat.
Explanation:
84. The general rule for rating refrigeration systems (excepting for C02 system) is to approximate following h.p. per ton of refrigeration
A. 0.1 to 0.5 h.p. per ton of refrigeration
B. 0.5 to 0.8 h.p. per ton of refrigeration
C. 1 to 2 h.p. per ton of refrigeration
D. 2 to 5 h.p. per ton of refrigeration
E. 5 to 10 h.p. per ton refrigeration.
Explanation:
85. The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.
A. more
B. less
C. equally.
D. unpredictable
E. none of the above.
Explanation:
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