Discussion
Which of the following method can NOT be used for speed control of universal motor?
Answer: B
Frequency control cannot be used for the speed control of a universal motor. The speed of a series motor depends on the voltage applied and the field strength, not on the supply frequency, since it has a commutator and is also run on DC.
Field flux control (by tapping the field winding), variable resistance control in series with the motor and centrifugal governor control are the methods in use. So the second option is the answer.
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