Following energized winding of a D.C. machine should not be opened as it would produce high inductive voltage which may be dangerous to personnel and may cause its own insulation failure.
Correct answer: D. Shunt field
- A. Series field
- B. Compensating field
- C. Inter pole field
- D. Shunt field
Explanation
An energized shunt field is highly inductive, so opening its circuit can produce a large induced voltage that damages insulation and endangers personnel. It also removes the machine's excitation abruptly.
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