1.

In an refrigerator, compressor motor is of `1kW` power. Heat is transferred from `-3^(@)C` to `27^(@)C`. Whast amount of heat is coming out of the refrigerator per second assuming that efficiency of refrigerator is `50%` of a perfect engine ?A. `5 kJ`B. `6 kJ`C. `19 kJ`D. `20 kJ`

Answer» Correct Answer - D
In an refrigerator ………….
Efficiency of ideal engine
`eta = 1- (270)/(300) = (1)/(10)`
Efficiency of refrigerator `= (1)/(20)`
`(1)/(20) = (1kJ)/(Q) implies Q_(1) = 20 kJ`


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