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Heat Engines

A frictionles...

Question

A frictionless heat engine can be $100 %$ efficient only if its exhaust temperature is

A

0^{o} C

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B

0 K

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C

equal to its input temperature

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D

half of its input temperature

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Solution

The correct option is D $0 K$
Maximum efficiency $η = 1 - \frac{T_{c}}{T_{h}} = 1 o n l y i f T_{c} = 0 K$

Hence, option B is correct.

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