Question

Calculate the value of the conduction angle for R-L load if the value of β and α are 56° and 18°.

(a) 48°

(b) 38°

(c) 57°

(d) 15°

I have been asked this question during an internship interview.

This interesting question is from Solid-State Switching Circuits topic in portion Introduction to Solid-State Switching Circuits of Electric Drives

Answer 1

The correct answer is (b) 38°

For explanation I would say: The conduction angle for R-L load is β-α=56°-18°=38°. R-L load is a current stiff type of load. The current in the circuit only flows from α to β.