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Speed control of single-phase series motor (AC) can be done by:
  • a)
    Pole changing
  • b)
    Frequency variation
  • c)
    Voltage variation
  • d)
    Shifting of brushes
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Speed control of single-phase series motor (AC) can be done by:a)Pole ...
Speed control of single-phase series motor (universal motor) is best obtained by solid-state devices by varying the voltage. Since the speed of these is not limited by the supply frequency and may be as high as 20000 rpm. They are most suitable for applications requiring high speeds.
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