Which of the following statement(s) associated with installation and preventive maintenance of ___

Which of the following statement(s) associated with installation and preventive maintenance of dc machines is incorrect ?

A. Accumulation of carbon dust on the commutator surface may result in flash-over
B. The commutator should be lubricated in order to reduce brush friction
C. Accumulation of dust on the machine may result in overheating of the machine
D. Sufficient space is necessary all around the motor for movement of operational and maintenance personnels
E. Resistance of earth continuity conductor is to be checked periodically in order to ensure the effectiveness of the earthing system.

Show Answer

Answer: B

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