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Q.

An ideal heat engine exhausting heat at 770C  is to have a 25% efficiency. It must take heat at

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a

1270C

b

2270C

c

3270C

d

1930C

answer is D.

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Detailed Solution

η=1−T2T1                                    ⇒25100=1−(273+77)T1                 T1=466k  (or) 1930C
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An ideal heat engine exhausting heat at 770C  is to have a 25% efficiency. It must take heat at