A boiler generates \(7.5 \mathrm{~kg}\) of steam per \(\mathrm{kg}\) of coal burnt at a pressure of 11 bar. The feed water temperature is \(70^{\circ} \mathrm{C}\); boiler efficiency is \(75 \%\); factor of evaporation is \(1.15 ; C_{p}=2.1 \mathrm{~kJ} / \mathrm{kgK}\). Calculate: (i) degree of superheat and temperature of steam generated, (ii) calorific value of coal in \(\mathrm{kJ} / \mathrm{kg}\), and (iii) equivalent evaporation in \(\mathrm{kg}\) of steam per \(\mathrm{kg}\) of coal.