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Answer :

Commutator brushes are made up of carbon.

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Description : _____ brushes are fragile and cause excessive wear of commutator, (a) Natural graphite (b) Hard carbon (c) Electro graphitic (d) Metal graphite

Answer : (a) Natural graphite

Description : Which of the following are the parts of a DC generator that convert the AC in the armature to DC in the external circuit. Are these parts the: w) field poles x) slip rings and the brushes y) commutator and the brushes z) armature and the core

Answer : ANSWER: Y -- COMMUTATOR AND THE BRUSHES

Description : The current from the stator of an alternator is taken out to the external load circuit through (A) slip rings. (B) commutator segments. (C) solid connections. (D) carbon brushes.

Answer : (C) solid connections.

Description : The material for commutator brushes is generally (a) mica (b) copper (c) cast iron (d) carbon

Answer : Ans: d

Answer : The number of brushes in a commutator depends onĀ amount of current to be collected.