Question: A single phase half controlled converter controlling the voltage supplied to the field is used to boost the no load speed of a separately excited

A single phase half controlled converter controlling the voltage supplied to the field is used to
boost the no load speed of a separately excited dc machine by weakening its field supply. At
=20 the half controlled converter produces the rated field voltage. If the field inductance is
large enough to make the field current almost ripple free what will be the input power factor
when the dc motor no load speed is boosted to 120%?

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