A Carnot engine is working between 127°C and 27°C. The increase in efficiency will be maximum when the temperature of(a) the source is increased by 50°C(b) the sink is decreased by 50°C(c) source is increased by 25°C and that of sink is decreased by 25°C(d) both source and sink are decreased by 25°C each.
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Here option B will be correct because if you subtract 0.37-0.25 you will get the maximum difference. As you have asked maximum efficiency so after carefully examining this difference is the maximum one
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