1.

Read the following paragraph and answer the following questions. According to Kelvin Planck's statement of second law of thermodynamic no process is possible whose sole result is the adsorption of heat from a reservoir and the complete conversion of heat into work. A carnot heat engine works at temperatures 227^(@)C and 127^(@)C. It absorbs 6.0 xx 10^(4) calories of heat from the source at high temperature in each cycle. The amount of heat converted into work in above carnot engine is :

Answer»

`1.2xx10^(4)` cals
`1.8xx10^(4)` cals
`3.5 xx10^(5)` cals
`4.8xx10^(4)` cals

Solution :`ETA=1-((T_(2))/(T_(1)))=1-(400)/(500)=(1)/(5)`
`therefore eta =(W)/(theta_(1)) rArr W=(1)/(5) xx6xx10^(4)=1.2xx10^(4)` cal
So, correct choice is (a).


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