Correct option is A
A superheater is a device used to increase the temperature of steam above its saturation temperature without increasing its pressure. Superheated steam is dry and contains more thermal energy, which makes power generation more efficient.Why Superheaters Are Used in Thermal Power PlantsThermal power plants operate on the Rankine cycle, which uses steam to drive turbines. In these plants:1. Steam Generation∙ Water is converted into saturated steam in the boiler.2. Superheating Process∙ The saturated steam passes through a superheater.∙ Its temperature is increased above the boiling point at constant pressure.3. Advantages of Superheated Steam∙ Higher thermal efficiency of the plant∙ Increased turbine output∙ Reduced moisture content, preventing turbine blade erosion∙ Improved overall reliability of turbinesBecause of these benefits, superheaters are an essential component of thermal (coal-fired or oil-fired) power plants.