Discussion
A twelve-pulse rectifier is used in place of a six-pulse one in order to
Answer: A
Correct answer: reduce the harmonics drawn from the supply
Two six-pulse bridges fed from transformer windings 30 degrees apart give twelve pulses per cycle. On the supply side the fifth and seventh harmonics cancel, leaving the eleventh and thirteenth as the lowest present and much reducing the distortion the installation injects into the network. On the dc side the ripple frequency doubles and its amplitude falls, so less smoothing is needed - though not none. The mean voltage and the quadrant capability are unchanged.
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