Question: A three-phase diode bridge is supplied by a three-phase autotransformer such that the line-to line input voltage to the bridge can be varied from zero

A three-phase diode bridge is supplied by a three-phase autotransformer such that the line-to line input voltage to the bridge can be varied from zero to 230 V. The output of the bridge is connected to the shunt field winding of a dc motor. The resistance of this winding is 158Ω. The autotransformer is adjusted to produce a field current of 1.75 A. Calculate the rms output voltage of the autotransformer.

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