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According to the second law of thermodynamics :

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An Intiative by Sri Chaitanya

heat energy cannot be completely converted to work

work can be completely converted to heat energy

for all cyclic processes we have $dQ / T < 0$

the reason all heat engine efficiencies are more than $100 %$ .

answer is A.

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Heat cannot be converted in $100 %$ work, but reverse is true.

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