The material used for commutator brushes is mostly
A. copper.
B. carbon.
C. mica.
D. cast iron.
Show Answer
Answer: B
Share your understanding of this question with the correct explanation.
The material commonly used for commutator brushes in DC machines is carbon.
Carbon brushes are preferred for commutator applications due to their excellent electrical conductivity, low friction, and good brush-to-commutator contact. They have a high resistance to wear and can handle high current densities. Additionally, carbon brushes produce less sparking and are suitable for high-speed applications.
Therefore, the correct answer is option B: carbon.