Questions
An ideal heat engine has an efficiency . The coefficient of performance of the engine when driven backward will be
a
1-(1η)
b
η-(1η)
c
(1η)-1
d
(11-η)
detailed solution
Correct option is C
η = 1-T2T1and ω = T2T1-T2 = T2T11-(T2T1) = (1-η)η = 1η-1Talk 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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