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Q)

A Carnot engine, whose efficiency is 40%, takes in heat from a source maintained at a temperature of 500 K. It is desired to have an engine of efficiency 60%. Then, the intake temperature for the same exhaust (sink) temperature must be


( A ) 600 K
( B ) efficiency of Carnot engine canno be made larger than 50%
( C ) 1200 K
( D ) 750 K

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