Answer:

The correct option is bleeder turbine (option B). In a bleeder turbine, steam is taken from various points along the turbine solely for feed water heating. Let's understand this in detail:

Steam Turbines:
Steam turbines are devices that convert thermal energy from steam into mechanical energy, which is then used to generate electricity or perform other mechanical work. They are widely used in power plants and industrial processes.

Bleeder Turbine:
A bleeder turbine is a type of steam turbine that extracts steam from various points along the turbine for different purposes. In the case mentioned, the steam extracted from the turbine is used solely for feed water heating.

Feed Water Heating:
Feed water heating is a process in which the temperature of the water entering the boiler is increased by utilizing the waste heat from the turbine's exhaust steam. This preheated water requires less energy to reach the desired temperature, resulting in improved overall efficiency of the power plant.

Advantages of Bleeder Turbine:
Here are some advantages of using a bleeder turbine for feed water heating:

1. Improved Efficiency: By extracting steam from various points along the turbine, the waste heat is utilized effectively, resulting in higher overall thermal efficiency of the power plant.

2. Reduced Fuel Consumption: With preheated feed water, less fuel is required to reach the desired steam temperature, leading to reduced fuel consumption and operating costs.

3. Increased Power Output: By utilizing waste heat for feed water heating, more steam is available for power generation, thereby increasing the power output of the turbine.

4. Enhanced Equipment Life: The use of bleeder turbines reduces thermal stresses on the turbine blades and other components, leading to improved reliability and longer equipment life.

5. Flexibility: Bleeder turbines provide flexibility in controlling the extraction steam flow at different points along the turbine, allowing for optimal feed water heating as per the plant's requirements.

Overall, a bleeder turbine is an efficient and cost-effective solution for utilizing waste heat in steam turbines for feed water heating, resulting in improved power plant performance.