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A gas undergoes step 4 in Carnot cycle. Which of these processes describes the 2nd step?

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A gas undergoes step 4 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 at a job interview.

Query is from Heat Engines in section Internal Combustion Engines of Automobile Engineering

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The correct choice is (b) Isentropic compression

For explanation: The 4th process in carnot cycle is isentropic compression.

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