Question

For a SCR, conduction angle is 120° when average on-state current is 20 A. When the conduction angle is halved the earlier value, the on-state average current will be?

(a) 5 A

(b) 40 A

(c) 10 A

(d) 20 A

This question was posed to me in an international level competition.

This is a very interesting question from Miscellaneous in chapter Applications, Cycloconverters and  Miscellaneous of Power Electronics

Answer 1

Correct option is (b) 40 A

Easiest explanation: When the conduction angle is halved, the device will conduct twice then it was conducting earlier. Hence, I = 2x 20 = 40 A.