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A single-phase half-controlled bridge, or semi-converter, feeding a dc motor allows operation in

  • A.all four quadrants of the torque-speed plane without restriction
  • B.no quadrant at all
  • C.one quadrant only
  • D.two quadrants

Answer: C

The freewheeling path prevents the output voltage from reversing, so power can flow only from supply to machine. Motoring in one direction is all that is available, and braking must be arranged mechanically or with a separate resistor.

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