The efficiency of the reversible heat engine is ηr, and that of irreversible heat engine is ηl. Which of the following relations is correct?
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a
ηr > ηl
b
ηr < ηl
c
ηr >, ηl
d
ηr > 1 and ηl < 1
answer is A.
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Detailed Solution
The efficiency of reversible engine is always greater than that of irreversible engine. In case of irreversible engine, a part of the energy may be dissipated against friction, etc.