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Q.

A Carnot engine, whose efficiency is 40%, receives heat at 500 K. If its efficiency is 50% then the intake temperature for the same exhaust temperature is

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a

600 K

b

700 K

c

800 K

d

900 K

answer is A.

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Detailed Solution

We know that, Î·=1−T2T1For first case 40100=1−T2500∴ T2=300KFor second case 50100=1−300T1or     T1=600K
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