engineering recuitment MP Vyapam Sub Engineer Mock Test 2024 Heat Engine

What is the efficiency or coefficient of performance of an engine? (where: Q2 = magnitude of input heat; Q1 = magnitude of rejected heat)

1
η = Q2 - Q1/Q2
2
η = Q2/Q1 - Q2
3
η = Q1/Q2 - Q1
4
η = Q2 - Q1/Q1
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