Question

A motor load is connected to a single-phase full converter B-2 type controlled rectifier. The net energy is transferred from ac source to the motor (dc load) when

(a) π+α > 90

(b) π-α > α

(c) π+α > α

(d) π-α > 90

This question was posed to me during an interview.

Origin of the question is Single Phase FW AC-DC-3 topic in section Converters of Power Electronics

Answer 1

Correct choice is (b) π-α > α

To elaborate: Converter will work as a line commuted inverter when π-α > α.