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An ideal Carnot's engine whose efficienc...

An ideal Carnot's engine whose efficiency 40% receives heat of 500K. If the efficiency is to be 50% then the temperature of sink will be

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600 k
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In a Carnot engine the temperature of source is 1000 K and the efficiency of engine is 70%. What is the temperature of the sink ?

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A carnot engine has an efficiency of 30% .Its efficiency is to be increased to 50% .By what must the temperature (in K) of the source be increased if the sink is at 300K ?

A Carnot's engine whose sink is at temperature of 300K has an efficiency of 40% By how much should the temperature of the source be increased so as to increase the efficiency to 60%?