Question

In case of an RC full wave firing circuit with R load, the voltage across the load is zero for____________

(a) ωt = 0 to α and ωt = π to 2π+α

(b) ωt = 0 to α

(c) ωt = π to 2π+α

(d) ωt = α to 2π

This question was addressed to me by my school principal while I was bunking the class.

My doubt is from Firing Circuits-3 in chapter Other Circuits of Power Electronics

Answer 1

Correct option is (b) ωt = 0 to α

Easiest explanation: The SCR is not triggered(turned-on) until α, hence no current flows until α.