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23. A reversible engine converts one-sixth of the heat input into work. When the temperature of the sink is reduced by 62°C, the efficiency of the engine is doubled. The temperatures of the source and sink are

(a)  80°C, 37°C                                (b)  95°C, 28°C

(c)   90°C, 37°C                               (d) 99°C, 37°C

Answer-d

(4)

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