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A fully controlled bridge feeding a dc motor allows operation in

  • A.one quadrant only, both the voltage and the current being unidirectional
  • B.all four quadrants without any additional equipment being needed
  • C.no quadrant, the bridge being unable to control the output voltage
  • D.two quadrants, with reversible voltage but unidirectional current

Answer: D

Advancing the firing angle beyond ninety degrees reverses the mean output voltage, so the machine can regenerate while its current keeps one sense. Reversing the torque as well requires either a field reversal or a second bridge.

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