A real heat engine has an efficiency of 40%. The work output of the engine is 100kJ per cycle. How much energy is extracted from the high temperature reservoir per cycle ?
A
40kJ
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B
250kJ
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C
400kJ
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D
Can be calculated only if the engine is a Carnot engine.
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Solution
The correct option is B250kJ Given,
Efficiency of heat engine (η)=40%
Work output (W)=100kJ
Using the formula,
Efficiency (η)=Work output(W)Heat input(Q) 0.4=100Heat input(Q) ∴ Heat extracted from high temperature reservoir per cycle Q=1000.4=250kJ
Thus, option (b) is the correct answer.