Questions
The coefficient of performance of a refrigerator is 5. If the temperature inside freezer is , the temperature of the surroundings to which it rejects heat is:
detailed solution
Correct option is B
Coefficient of performance of refrigeratorCOP = TLTH-TLwhere TL→ lower temperature and TH → Higher temperatureSo, 5 = TLTH-TL⇒TH = 65TL = 65(253) = 303.6 K. Therefore tH =30.60 C ≃310CTalk to our academic expert!
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An electrical refrigerator abstracts 2000 calories from ice trays. The coefficient of performance is 4. Then the work done by motor in calories is
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