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What is the efficiency of a heat engine with heat input 10 J and work output 7 J?

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What is the efficiency of a heat engine with heat input 10 J and work output 7 J?

(a) 30%

(b) 70%

(c) 100%

(d) 140%

I had been asked this question in a job interview.

My question comes from Efficiency topic in portion Energy Balances that Include the Effects of Chemical Reaction, Ideal Processes, Efficiency and the Mechanical Energy Balance and Heats of Solution and Mixing of Basic Chemical Engineering

1 Answer

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Right option is (b) 70%

For explanation: Efficiency = 7/10*100 = 70%.

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