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A gas undergoes step 2 in Carnot cycle. Which of these processes describes the 2nd step?

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A gas undergoes step 2 in Carnot cycle. Which of these processes describes the 2nd step?

(a) Isentropic expansion

(b) Isentropic compression

(c) Isothermal expansion

(d) Isothermal compression

I got this question in a national level competition.

I'd like to ask this question from Heat Engines topic in portion Internal Combustion Engines of Automobile Engineering

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The correct choice is (a) Isentropic expansion

To explain: The 2nd process in carnot cycle is isentropic expansion.

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