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Earlier then the semiconductor technology, ___________ devices were used for voltage control applications.

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in Power Electronics by (27.1k points)
Earlier then the semiconductor technology, ___________ devices were used for voltage control applications.

(a) cycloconverters

(b) vacuum tubes

(c) tap changing transformer

(d) induction machine

The question was posed to me in an interview.

Origin of the question is AC Voltage Controllers-1 in portion Voltage Controllers of Power Electronics

1 Answer

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by (45.1k points)
The correct answer is (c) tap changing transformer

For explanation I would say: A tap changing transformer can give variable ac from fixed ac without a change in frequency.

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