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Question

The efficiency of the heat engine is

A
75%
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B
33%
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C
50%
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D
25%
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E
100%
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Solution

The correct option is B 33%
Heat added to the system Qa=W+Qr=50+100=150 J
Efficiency of the engine η=WQa×100=50150×100=0.33×100
Thus the engine is 33 % efficient.

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