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Q.

The efficiency of a Carnot engine kept at the temperatures of 270C and 1270C is

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a

20%

b

25%

c

30%

d

40%

answer is B.

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Detailed Solution

Efficiency,  η=1−T2T1Given,   T2=27∘C=27+273=300KT1=127∘C=127+273=400Kη=1−34=25%
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