Question

In the thyristor gating circuit, the supply to the pulse amplifier is provided by the

(a) zcd

(b) isolation transformer

(c) synchronizing transformer

(d) control signal generator

This question was addressed to me during an online interview.

Origin of the question is Gating Circuits in section Other Circuits of Power Electronics

Answer 1

Correct choice is (b) isolation transformer

For explanation I would say: Isolation transformer provides the supply to the amplifier and also provides the necessary isolation for the load and triggering circuit.