Electrical Engineering MCQ Question on carbon brushes are preferable to copper brushes because
Carbon brushes are preferred in DC Machines to Copper Brushes because:
- Carbon brushes reduce armature reaction
- Copper brushes have high resistance
- Carbon brushes reduce sparking
- 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.