Question

Calculate the value of the fundamental displacement factor for 1-φ Full wave semi-converter if the firing angle value is 0^o.

(a) 1

(b) .8

(c) .4

(d) .2

The question was posed to me in an online interview.

My query is from Solid-State Switching Circuits topic in chapter Introduction to Solid-State Switching Circuits of Electric Drives

Answer 1

Correct answer is (a) 1

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(0^o)=1.