13. The temperature of sink of Carnot engine is 27°C. Efficiency of engine is 25%. Then temperature of source is
(a) 227°C (b) 327°C
(c) 127°C (d) 27°C
Answer-c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a