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Question

In one complete cycle, a heat engine extracts heat Qh from a thermal reservoir, does work W and does not eject any heat into the environment. This heat engine is impossible because its operation violates:


A

Conservation of energy (1st Law) only

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B

2nd Law only

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C

Both 1st Law and 2nd Law

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D

Neither 1st nor 2nd law

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Solution

The correct option is B

2nd Law only


This would violate the 2nd Law only. The entropy of the hot reservoir decreases by ΔS=QT. The entropy of the engine did not change (since it returns to its initial state). The entropy of the rest of the universe did not change, since doing pure work does not change entropy.

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