MCQ Practice Question

In phase-controlled rectifiers, firing angle alpha is measured from?

AThe reference point where the device would naturally become forward-biased in the supply cycle
BThe instant of maximum load current only
CThe end of every negative half-cycle only
DThe gate-current peak regardless of supply waveform

Correct Answer: A. The reference point where the device would naturally become forward-biased in the supply cycle

Explanation: The firing delay angle alpha specifies how long triggering is delayed from the natural forward-bias reference in each applicable cycle.

Reference: Standard power electronics: controlled rectifiers