Single Phase Motors
The speed control of universal motor used for sewing machines is by

Varying the resistance
Tapping the field
Friction
Centrifugal mechanism

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

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

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