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Q119 (CAPF/2026) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Which of the following statements regarding Carnot engine is/are correct?
1. It is an irreversible engine operating between two temperatures T1 (source) and T2 (sink).
2. Its efficiency is given by n= 1-T2 /T1, where T] is the temperature of source and T2 is the temperature of sink.
Select the answer using the code given below.

Explanation

A Carnot engine is a theoretical, idealized heat engine that operates on the Carnot cycle. A fundamental characteristic of this engine is that it is reversible; it consists of two isothermal and two adiabatic processes that are all reversible. Therefore, Statement 1 is incorrect because it labels the engine as irreversible.

The efficiency (often denoted by η or 'n' in the question) of a Carnot engine is determined solely by the absolute temperatures of the source (T1) and the sink (T2). The formula for efficiency is n = 1 - T2/T1 (where temperatures are in Kelvin). This efficiency represents the maximum theoretical limit for any heat engine operating between those two temperatures. Consequently, Statement 2 is correct.

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