Question

Calculate the value of the fundamental displacement factor for 1-Φ Full wave semi-converter if the firing angle value is 69°.

(a) .48

(b) .24

(c) .82

(d) .88

I have been asked this question in semester exam.

The question is from Solid-State Switching Circuits topic in section Introduction to Solid-State Switching Circuits of Electric Drives

Answer 1

The correct option is (c) .82

Easiest explanation: Fundamental displacement factor is the cosine of angle difference between the fundamental voltage and fundamental current. The fundamental displacement factor for 1-Φ Full wave semi-converter is cos(∝÷2)=cos(34.5°)=.82.