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A semiconductor switch in a drive is operated

  • A.in its linear region, as an amplifier would be
  • B.at a fixed current whatever the load requires
  • C.only once per cycle of the incoming supply
  • D.fully on or fully off, never in between

Answer: D

Switching rather than throttling is what makes the efficiency high, since a device that is fully on drops little voltage and one that is off carries no current. Dwelling in between is what destroys devices, which is why transitions are made as fast as the circuit allows.

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