What are the materials used for brushes in dc machines?(a) Iron(b) Carbon(c) Aluminum(d) SteelI had been asked this question by my school principal while I was bunking the class.This key question is from Construction in section DC Machines of DC Machines

What are the materials used for brushes in dc machines?(a) Iron(b) Car

1.	What are the materials used for brushes in dc machines?(a) Iron(b) Carbon(c) Aluminum(d) SteelI had been asked this question by my school principal while I was bunking the class.This key question is from Construction in section DC Machines of DC Machines
Answer» RIGHT answer is (b) CARBON Explanation: On some EXTENT carbon brush can act as a self-lubricating brush. On moment, polishes the commutator segments. Damage to the commutators is less when COPPER BRUSHES are used on occurrence of sparkover.

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