Question

# A carnot engine absorbs 760 kJ heat from a source at 380 K. It rejects (I) 650 kJ, (II) 560 kJ of heat to sink at 280 K. State which of these represent a reversible and irreversible cycle.

A
I - Reversible , II - Irreversible
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B
I - Reversible, II - Reversible
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C
I - Irreversible, II - Irreversible
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D
I - Irreversible, II - Reversible
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Solution

## The correct option is D I - Irreversible, II - ReversibleEfficiency of carnot engine (η)=Qh−QcQh=Th−TcTh According to given data, ηrev=380−280380=0.2631 For cycle I : η1=760−650760=0.1447 ∵ η1<ηrev Hence cycle is irreversible. For cycle II : η2=760−560760=0.2631 ∵ η2=ηrev Hence the cycle is reversible.

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