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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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An Intiative by Sri Chaitanya

a

840 K

b

280K

c

560K     

d

 

373.3K

 

answer is D.

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Detailed Solution

 

η=1−T2T1

0.5=T1−(273+7)T1

T1=560K

η1=T11−(273+7)T11

0.7=T11−(280)T11

T11=933K

ΔT=933−560

=373.3K      

 

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