Engine : Electricity - 1241/1386
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| In addition to improper brush pressure or seating, what can result in excessive sparking at the brushes of a DC propulsion motor? |
| A) improper positioning of brush rigging outside the neutral plane |
| B) reversed main field polarity with respect to the armature |
| C) operating at continuously varying loads such as during maneuvering |
| D) reversed armature polarity with respect to the field |
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