ANS:B - superheated

For the running of power generating turbines, the steam used should be superheated. Superheated steam is steam that has been heated to a temperature above its saturation point at a given pressure. In power generating turbines, superheated steam is preferred because it carries more energy per unit mass compared to saturated steam at the same pressure. This additional energy is utilized to drive the turbines more efficiently, resulting in increased power generation. Superheated steam also helps prevent erosion and corrosion of turbine blades by reducing the moisture content and minimizing the likelihood of water droplets impinging on the turbine surfaces. Additionally, superheated steam allows for better control over turbine operation and improves overall plant efficiency. In contrast, wet steam contains moisture in the form of droplets or liquid water mixed with the vapor phase. Wet steam can lead to erosion, corrosion, and reduced turbine efficiency. Steam at ordinary pressure may not provide the necessary energy required for efficient turbine operation in power generation applications. Therefore, superheated steam is the preferred choice for running power generating turbines.