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A class E chopper provides

  • A.two-quadrant operation identical to that of a class C chopper
  • B.regenerative braking only, without any motoring capability
  • C.four-quadrant operation
  • D.one-quadrant operation with a very much reduced current ripple

Answer: C

Correct answer: four-quadrant operation

A class E chopper is a full bridge of four switches with their diodes, so the armature voltage and current can each take either sign independently. That gives motoring and regenerative braking in both directions of rotation - all four quadrants - from a single unipolar supply, which is what a reversing servo or traction drive requires.

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