The correct answer is: B. 0.8 to 1.0 Wb/m2
The maximum flux density for distribution transformers using hot rolled silicon steel is typically 0.8 to 1.0 Wb/m2. This is because hot rolled silicon steel has a high permeability, which means that it can be magnetized to a high level with a relatively small amount of current. This makes it ideal for use in transformers, where the goal is to minimize the amount of copper required to carry the current.
The maximum flux density is the maximum amount of magnetic flux that can be safely stored in a material without causing it to saturate. If the flux density exceeds the maximum value, the material will become saturated and will no longer be able to store any additional magnetic flux. This can lead to a number of problems, including increased core losses, decreased efficiency, and even transformer failure.
Therefore, it is important to select a material with a maximum flux density that is appropriate for the application. In the case of distribution transformers, a material with a maximum flux density of 0.8 to 1.0 Wb/m2 is typically used. This provides a good balance between performance and cost.
The other options are incorrect because they do not represent the typical maximum flux density for distribution transformers using hot rolled silicon steel. Option A is too low, while options C and D are too high.