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Byju's Answer
Standard XII
Physics
Heat Engines
Efficiency of...
Question
Efficiency of heat engine can never be 1.Why
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Solution
For 100% efficiency T1 = ∞ (or) T2 = 0 k. As absolute zero and infinite temperature cannot be
realized in practice, the efficiency of a heat engine cannot have 100%. The efficiency of a heat
engine is always less than unity.
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