Feed water enters a boiler at $30C.$ Steam leaves the boiler $95\%$ dry at a pressure of

$2600$ KPa and passes through a super$-$heater where its temperature is raised to $260C$

at constant pressure. The steam output is $8\mathrm{.}5$ kg of coal burnt. The coal has a calorific

value of $50M\frac{J}{k}g,$ calculate

$3\mathrm{.}1.$ The plant efficiency.

$3\mathrm{.}2.$ The equivalent evaporation from and at $100C.$

$3\mathrm{.}3.$ The heat transfer rate per kg of coal in the evaporator and in the superheater.