Single Phase Motors
In a universal motor, the most common cause of brush sparking is

open armature winding
all of these
shorted field winding?
high commutator mica

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Single Phase Motors
If the centrifugal switch of a two-value capacitor motor using two capacitors fails to open then

current drawn by the motor will be excessively high
motor will not carry the load
motor will not come up to speed
electrolytic capacitor will, in all probability, suffer break down

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