A boiler generates \(8 \mathrm{~kg} / \mathrm{kg}\) of coal burnt at a pressure of 10 bar. The feed water temperature is \(70^{\circ} \mathrm{C}, \eta_{\text {boiler }}=75 \%\) and factor of evaporation \(=1.15\). Take \(c_{p s}=2.1 \mathrm{kj} / \mathrm{kg} \cdot \mathrm{K}\). Calculate

(a) degree of superheat and temperature of steam generated,

(b) Calorific value of coal \(\mathrm{kJ} /\) \(\mathrm{kg}\), and

(c) equivalent evaporation in \(\mathrm{kg}\) of steam \(/ \mathrm{kg}\) of coal.