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Q.

Carnot’s cycle operates between T and 300 K (T > 300K). it is 25% efficient when temperature of  source (T) is

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a

450 K

b

400 K

c

375 K

d

350 K

answer is B.

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Detailed Solution

T2=TK?;T1=300K;η=25%=25100=0.25

η=1-T1T2 Or T1T2=1-η=1-0.25=0.75

T2=3000.75=400K

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Carnot’s cycle operates between T and 300 K (T > 300K). it is 25% efficient when temperature of  source (T) is