Due to which of the following factors the brush wear rate is altered ?
(A) Speed of the machine
(B) Contact pressure
(C) Surface conditions of brush and commutator
(D) Excessive sparking
(E) All of the above
Due to which of the following factors the brush wear rate is altered ?
(A) Speed of the machine
(B) Contact pressure
(C) Surface conditions of brush and commutator
(D) Excessive sparking
(E) All of the above
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