In a cold storage, ice melts at the rate of 2 kg per hour when the external temperature is 20^ C . The minimum power output of the motor used to drive the refrigerator which just prevents the ice from melting is (latent heat of fusion of ic

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In a cold storage, ice melts at the rate of 2 kg per hour when the external temperature is 20^ C . The minimum power output of the motor used to drive the refrigerator which just prevents the ice from melting is (latent heat of fusion of ice =80 cal g ⁻¹ )

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Correct answer: B. 13.6 W

The coefficient of performance of refrigerator is cop = Q ₂ ~W = T ₂ ~T ₁- T ₂ ~mL ~W = 273 20 W = 20 273 2 10^3 60 60 80 4.2=13.6 ~W

In a cold storage, ice melts at the rate of 2 kg per hour when the external temperature is 20^ C . The minimum power output of the motor used to drive the refrigerator which just prevents the ice from melting is (latent heat of fusion of ice =80 cal g ⁻¹ )

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