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What is the efficiency of the system, if the actual work input from the process is 10 J and work input for a reversible process is 20 J?

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What is the efficiency of the system, if the actual work input from the process is 10 J and work input for a reversible process is 20 J?

(a) 20%

(b) 50%

(c) 100%

(d) 200%

I have been asked this question in a national level competition.

This interesting question is 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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The correct choice is (d) 200%

Explanation: Efficiency = 20/10*100 = 200%.

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