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In the principle of phase control

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in Power Electronics by (27.1k points)
In the principle of phase control

(a) the load is on for some cycles and off for some cycles

(b) control is achieved by adjusting the firing angle of the devices

(c) control is achieved by adjusting the number of on off cycles

(d) control cannot be achieved

I had been asked this question in exam.

This intriguing question comes from AC Voltage Controllers-1 topic in chapter Voltage Controllers of Power Electronics

1 Answer

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by (45.1k points)
The correct answer is (b) control is achieved by adjusting the firing angle of the devices

To explain: Switching devices is so operated that the load gets connected to ac source for a part of each half cycle.

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