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Calculate the coefficient of performance of a refrigerator working between -10oc to 20oc is

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a

6.77

b

7.77

c

8.77

d

10.77

answer is C.

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Detailed Solution

temperature of source is T1=20+273=293 K (converting into kelvin scale) temperature of sink is T2=-10+273=263 KFor Refrigerator coefficient of performance is β=T2T1-T2 substitute the given values β=263293−263=26330 β=8.77

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