Question

AC voltage controllers convert

(a) fixed ac to fixed dc

(b) variable ac to variable dc

(c) fixed ac to variable ac

(d) variable ac to fixed ac

I have been asked this question during an interview for a job.

The query is from AC Voltage Controllers-1 topic in section Voltage Controllers of Power Electronics

Answer 1

Right answer is (c) fixed ac to variable ac

Easiest explanation: Voltage controllers convert the fixed ac voltage to variable ac by changing the values of the firing angle.