In a mechanical refrigerator, the low temperature coils are at a temperature of -33oC and the compressed gas in the condenser has a temperature of 27oC. The theoretical coefficient of performance is
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a
5
b
8
c
4
d
6.5
answer is C.
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Detailed Solution
Coefficient of performance K=T2T1−T2=(273−33)(273+27)−(273−33)=240300−240=24060=4