minor insulation
major insulation
either of the above
none of the above
Answer is Right!
Answer is Wrong!
The correct answer is: B. major insulation.
The insulation between windings and grounded core is called major insulation. It is designed to withstand the full rated voltage of the transformer. The insulation between windings of the same phase is called minor insulation. It is designed to withstand the voltage between the windings, which is usually much lower than the rated voltage of the transformer.
Here is a more detailed explanation of each option:
- A. minor insulation is the insulation between windings of the same phase. It is designed to withstand the voltage between the windings, which is usually much lower than the rated voltage of the transformer.
- B. major insulation is the insulation between windings and grounded core. It is designed to withstand the full rated voltage of the transformer.
- C. either of the above is not correct because major insulation and minor insulation are two different types of insulation with different purposes.
- D. none of the above is not correct because major insulation and minor insulation are both types of insulation that are used in transformers.