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

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

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Single Phase Motors
Which of the following statements regarding repulsion-start induction motor is incorrect ?

In fractional horse power motors, it has replaced the capacitor motors
It makes quite a bit of noise on starting
It is not easily reversed
It requires more maintenance of commutator and other mechanical devices

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