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In a Carnot heat engine operating with irreversible steps, which outcome results from frictional losses driving down system temperature?

A)Work output is reduced
B)Efficiency always stays constant
C)Heat input is unlimited
D)The cycle turns reversible

💡 Explanation

The work output decreases because `the second law efficiency` measures actual performance divided by ideal Carnot values; frictional processes raise the system's entropy, so the useful converted energy lessens, therefore lowers the output rather than creating energy or becoming stable.

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