1.

A Carnot heat engine has an efficiency of `10%`. If the same engine is worked backward to obtain a refrigerator, then find its coefficient of performance.A. 3B. 5C. 7D. 9

Answer» Correct Answer - D
Efficiency of carnot engine is, `eta = 1 - (T_(2))/(T_(1))`
`0.1 = 1 - (T_(2))/(T_(1))`
`:. (T_(2))/(T_(1)) = 0.9`
Coefficient of perfomance (COP) of a refrigerator `= (T_(2))/(T_(1) - T_(2)) = (0.9T_(1))/(T_(1) - 0.9T_(1)) = 9`
`:. COP = 9`


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