Questions
The second law of thermodynamics implies
a
whole of heat can be converted into mechanical energy
b
no heat engine can be 100% efficient
c
every heat engine has an efficiency of 100%
d
a refrigerator can reduce the temperature to absolute zero
detailed solution
Correct option is B
Efficiency of an ideal heat engine η=1−T2T1will be 100%, if T2 = 0 which is not possible to achieve.Alternatively η=WQA=QA−QRQAAccording to second Law of Thermodynamics, heat rejected (QR) cannot be zero.Hence ηcannot be 100%.Talk to our academic expert!
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An ideal Carnot engine whose efficiency is 40% receives heat at 500K if the efficiency is to be 50%, the intake temperature for the same exhaust temperature is.
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