Efficiency of reversible heat engine - Thermodynamics

Q.  How are the efficiencies of any heat engine (η) and reversible heat engine (ηR) compared, when both are operating between same heat source and same heat sink?
- Published on 19 Aug 15

a. η = ηR
b. η > ηR
c. η < ηR
d. cannot say

ANSWER: η < ηR

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