Carbon brushes are preferred in DC Machines to Copper Brushes because – DC Motor MCQ#12

Electrical Engineering MCQ Question on carbon brushes are preferable to copper brushes because

Carbon brushes are preferred in DC Machines to Copper Brushes because:

  1. Carbon brushes reduce armature reaction
  2. Copper brushes have high resistance
  3. Carbon brushes reduce sparking
  4. None of these

Correct answer: 3. Carbon brushes reduce sparking

Explanation: Carbon brushes are preferred in DC Machines to Copper Brushes because carbon brushes reduce sparking.

Additionally, the copper brushes cause faster wear and create more heat than carbon. A carbon brush on the other hand is designed to wear down much faster as and afterwards it can be cheaply replaced.

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