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Questions  

An ideal Carnot engine whose efficiency is 40% receives heat at 500K if the efficiency is to be 50%, the intake temperature for the same exhaust temperature is.

a
600 K
b
900 K
c
700 K
d
800 K

detailed solution

Correct option is A

T1=500K,Asn=1−T2T1 or T2T1=1−n ∴T2500=1−40100=35 or T2=300K now T2T1=1−n=1−50100=12 ∴T1=2T2=2×300=600K

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