GATE 2025 Power Electronics Foundation Quiz 53

Statement I: AC voltage regulators can be used to convert fixed AC to variable AC

Statement II: TRIAC can be used in phase-controlled Rectifiers.

Statement I: UJT firing circuit is suitable for feedback Networks.

Statement II: UJT depicts the negative resistance characteristics.

A DC source of 100 V supplies a purely inductive load 0.1H. The controller is a thyristor in series with the source and load. The latching current specified is 100mA . The minimum width of the gating pulse to ensure thyristor turn ON is

The holding current of thyristor in the single-phase full converter is I_H = 400 mA and the delay time is t_d = 2 μsec. The converter is supplied from a 120 V, 50 Hz supply and has a load of L = 10 mH and R = 10Ω. The converter is operated with a delay angle of α = 30°. Determine the minimum value of gate pulse width.