The efficiency of an engine is found to increase from 0.3 to 0.4 when the temperature of the sink is lowered by 50^(@)C. Calculate the temperature of sink and source.

The efficiency of an engine is found to increase from 0.3 to 0.4 when

1.	The efficiency of an engine is found to increase from 0.3 to 0.4 when the temperature of the sink is lowered by 50^(@)C. Calculate the temperature of sink and source.
Answer» Solution :`eta =1 - (T _(2) //T _(1)) ,0.3 =1 - (T _(2)// T _(1)), 0.4 = 1 - (T _(2) - 50 // T _(1)), ` solving `T _(1) = 500 K, T _(2) = 350 K`