Sparking, is discouraged in a D.C. motor because_____________?
Correct answer: B. commutator gets damaged
- A. it increases the input power con-sumption
- B. commutator gets damaged
- C. both A. and B.
- D. none of the above
Explanation
Sparking at the brushes produces intense local heating and arcing, which burns and pits the commutator surface. Although it also wastes energy, commutator damage is the principal reason it is discouraged.
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