Discussion
A class B chopper drive is used for
Answer: B
Correct answer: regenerative braking only
A class B chopper is the mirror image of class A: its switch and diode are arranged so that current flows from the machine back to the supply, giving negative current at positive voltage. It can therefore brake regeneratively but cannot motor. Classes A and B are combined as class C to give two quadrants, and two class C units make the class E four-quadrant chopper.
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