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