Question

In single phase RLE load, calculate the angle at which conduction starts using the data: (Vs)=14sin(Ωt), f=50 Hz, E=10 V.

(a) 45.58°

(b) 46.26°

(c) 47.26°

(d) 49.56°

I had been asked this question during an interview for a job.

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

Answer 1

Correct answer is (a) 45.58°

Explanation: The angle at which conduction starts when Vmsin(θ)=E. The conduction will remain from ϴ to π-θ. Θ=sin-(E÷Vm)=sin-(.71)=45.58°.