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For preventive maintenance of ade machine it is to be ensured that | |
A. | insulation resistances of the field and armature windings are proper [Wrong Answer] |
B. | commutator and brushes are in good condition. [Wrong Answer] |
C. | bearings are properly greased [Wrong Answer] |
D. | motor and its control gear are free from oil and grease. [Wrong Answer] |
E. | all of the above [Correct Answer] |