27. A Carnot engine whose low temperature reservoir is at 7°C has an efficiency of 50%. It is desired to increase the efficiency to 70%. By how many degrees should the temperature of the high temperature reservoir be increased
(a) 840 K (b) 280 K
(c) 560 K (d) 380 K
Answer-d
(84)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)