Questions
A Camot heat engine has an efficiency of 10%. If the same engine is worked backward to obtain a refrigerator, then find its coefficient of performance.
detailed solution
Correct option is B
η = 1 -T2T1, T1T2 = 11-η ω = T2T1-T2 = 1(T1T2 )-1 = 1[11-η]-1 = 1-ηηAs η = 10% = 0.1, ω = 1-0.10.1 = 9Talk 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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