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Q. Which of the following is the efficiency of a Carnot engine(a = Temperature of source, b=Temperature of sink)?
Answer: 1 - b/a
Notes: Carnot engine is a reversible engine operating between two temperatures T1 (source) and T2 (sink). The Carnot cycle consists of two isothermal processes connected by two adiabatic processes. The efficiency of a Carnot engine is given as: 1 - T2/T1

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