A Brush-Lifting Motor Uses a Radial Commutator, and Weights Are

question 8

Multiple Choice

A brush-lifting motor uses a radial commutator, and weights are mounted at the front of the armature. When the motor reaches about ____% of full speed, these weights swing outward due to centrifugal force and cause two push rods to act against a spring barrel and short-circuiting necklace.

• A) 50
• B) 60
• C) 75
• D) 90

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