What is the efficiency of a heat engine with heat input 10 J and work – McqOptions

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1.	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%
Answer» C. 100%

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What is the efficiency of a heat engine with heat input 20 J and work output 5 J?$
What is the efficiency of a heat engine with heat input 10 J and work output 7 J?$