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Question

An engine is designed to convert 30% of heat energy into work. If the steam in the engine has 90KJ of heat energy, then the useful work done by the engine is ___.

A
16 kJ
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B
20 kJ
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C
27 kJ
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D
17 kJ
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Solution

The correct option is C 27 kJ
Total heat energy supplied = 90 kJ
Total amount of heat energy utilised for work = 30%
Total efficient work done by the engine = 90×30100 kJ
Hence, the work done = 27 kJ

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