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Engine : Electricity - 1185/1386
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An open in the armature of a DC motor is suspected, but is not found by visual inspection of the commutator. What would be the next step in troubleshooting this problem?
A) test the commutator for a ground
B) conduct a bar to bar test of the armature
C) visually inspect the armature windings
D) conduct an insulation resistance test of the armature
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