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A single phase voltage controller has input of 230 V and a load of 15 Ω resistive. For 6 cycles on and 4 cycles off, determine the input pf.

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A single phase voltage controller has input of 230 V and a load of 15 Ω resistive. For 6 cycles on and 4 cycles off, determine the input pf.

(a) 0.6

(b) 0.7746

(c) 0.855

(d) 0.236

This question was addressed to me in final exam.

My doubt is from AC Voltage Controllers-3 in portion Voltage Controllers of Power Electronics

1 Answer

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by (45.1k points)
The correct answer is (b) 0.7746

Explanation: k = (6/6+4) = 6/10 = 0.6

input pf = √0.6 = 0.7746.

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