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Q.

An ideal heat engine exhausting heat at 77°C is to have a 30% efficiency. It must take heat at

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An Intiative by Sri Chaitanya

a

127°C

b

227°C

c

327°C

d

673°C

answer is B.

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Detailed Solution

η=T1−T2T1 η=0⋅3 and T2=273+77=350K ∴ 0⋅3=T1−350T1 or T1=227∘C

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