A steam power station has an overall efficiency of 20% and 0.5 kg of coal is burnt per kWh of electrical energy generated. Calculate the calorific value of the fuel. Heat equivalent of 1 kWh is 860 kcal.
1
8600 kcal/kg
2
344 kcal/kg
3
860 kcal/kg
4
2150 kcal/kg