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Question

In which process in a Carnot's heat engine, heat (Q1) is absorbed from a heat source?

A
Reversible isothermal expansion
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B
Reversible isothermal compression
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C
Reversible adiabatic expansion
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D
Reversible adiabatic compression
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Solution

The correct option is A Reversible isothermal expansion
Carnot's heat engine will follow carnot cycle.
In a Carnot's cycle the first step is a reversible isothermal expansion during which the working substance in the system absorbs heat from a heat source (which is at a higher temperature) and expands by doing work on surroundings.

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