The following constitute short-circuit in the armature winding.
Correct answer: D. All of the above
- A. Insulation failure between two commutator bars
- B. Insulation failure between two turns of a coil
- C. Two of more turns of the same coil getting grounded
- D. All of the above
Explanation
A short circuit can result from insulation failure between commutator bars, between turns of a coil, or from turns of the same coil becoming grounded. Therefore, all the listed faults represent armature-winding short-circuit conditions.
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