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What is the efficiency of the system, if the actual work input from the process is 20 J and work input for a reversible process is 25 J?

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What is the efficiency of the system, if the actual work input from the process is 20 J and work input for a reversible process is 25 J?

(a) 20%

(b) 80%

(c) 125%

(d) 150%

I got this question in final exam.

This intriguing question comes from Efficiency in division 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

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Correct choice is (c) 125%

The explanation: Efficiency = 25/20*100 = 125%.

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