Q.

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.
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The efficiency of the reversible heat engine is ηr, and that of irreversible heat engine is ηl. Which of the following relations is correct?