The correct answer is C. Star/star transformers work satisfactorily on balanced as well as unbalanced loads.
A star/star transformer is a type of transformer that has a star-connected primary winding and a star-connected secondary winding. The primary winding is connected to the power source, and the secondary winding is connected to the load. The transformer works by transferring power from the primary winding to the secondary winding through electromagnetic induction.
When the load is balanced, the current in each winding is equal. This means that the voltage across each winding is also equal. However, when the load is unbalanced, the current in each winding is not equal. This means that the voltage across each winding is also not equal.
A star/star transformer can work satisfactorily on balanced as well as unbalanced loads. However, the efficiency of the transformer is lower when the load is unbalanced. This is because the transformer has to work harder to transfer power when the load is unbalanced.
Here is a brief explanation of each option:
- Option A: Star/star transformers work satisfactorily when load is unbalanced only. This is incorrect because star/star transformers can work satisfactorily on balanced as well as unbalanced loads.
- Option B: Star/star transformers work satisfactorily when load is balanced only. This is incorrect because star/star transformers can work satisfactorily on balanced as well as unbalanced loads.
- Option C: Star/star transformers work satisfactorily on balanced as well as unbalanced loads. This is the correct answer.
- Option D: None of the above. This is incorrect because star/star transformers can work satisfactorily on balanced as well as unbalanced loads.