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Q.

A carnot engine whose low temperature reservoir is at 70C 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

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a

840 K

b

280K

c

560K

d

373.3K

answer is D.

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Detailed Solution

η=1−T2T10.5=T1−(273+7)T1T1=560Kη1=T11−(273+7)T110.7=T11−(280)T11T11=933KΔT=933−560=373.3K
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