For a particular heat engine, 3,000J of energy goes in at 700K and 2000J comes out at 200K. The rest of the energy is used to do useful work. What is the actual efficiency of this engine?
A
0.71
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B
0.33
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C
0.67
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D
0.29
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E
1.5
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Solution
The correct option is C0.33 Heat taken by the source QH=3000J
Heat rejected to the sink QL=2000J
∴ Actual efficiency of the engine η=1−QLQH=1−20003000=0.33