Discussion
Arrange these in increasing order of severity of commutation duty.
1. A small machine at steady load 2. A large machine at steady load 3. A large machine with rapid load reversals
Answer: C
Reactance voltage grows with the current to be reversed, and rapid load changes add the difficulty of a commutating flux that must track them. The first needs only carbon brushes, the second interpoles and the third pole-face compensation as well.
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