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Question

Carnot engine operating between temperature T1andT2 are efficiency 16.WhenT2 is lowered by 62 K its efficiency increases to 13 .Then T1andT2 are , respectively

A
372 K and 310 K
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B
372 K and 330 K
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C
330 K and 268 K
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D
310 K and 248 K
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Solution

The correct option is A 372 K and 310 K

Efficiency of Carnot engine is given by

η1=1T2T1

16=1T2T1

T2T1=56.........(1)

When T2 is lowered by 62K its efficiency increases to 1/3

So,

η2=1T262T1

13=1T262T1

2T13T2+186............(2)

Solving equation (1) and (2)

T1=372K

T2=310K


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