A Thyristor is connected between a dc source of 100 V and an inductive load of 20 Ω resistance and 1H inductance. Calculate the minimum gate pulse width required to turn on the thyristor with a latching current of 300mA.

The SCR in the circuit shown has a latching

current of 40 mA. A gate pulse of 50 μs is applied to the SCR. The maximum value of R in Ω to ensure successful firing of the SCR is

The latching current in the below circuit is 4 mA.

The minimum width of the gate pulse required to turn on the thyristor is

(a) 6 μs (b) 4 μs

(c) 2 μs (d) 1 μs

An SCR having a turn ON time of 5 s, latching current of 50 mA and

holding current of 40 mA is triggered by a short duration pulse and is used in the circuit shown in figure. The minimum pulse width required to turn the SCR ON will bea) 251 μs b) 150 μs

c) 100 μs d) 5 μs

A Thyristor controlled half wave rectifier supplies power to a resistive load of 15 Ω from 230 V, 50 Hz AC source. Calculate source RMS current and input power factor for a firing angle of 30°.

An SCR is connected in series with a 300 V AC

supply and 300 Ω load resistor. The reading of a moving coil ammeter connected in series with the load for a firing angle of 60° is

The circuit shows an ideal diode connected to a

pure inductor and is connected to a purely sinusoidal 50Hz voltage source. Under ideal conditions the current waveform through the inductor will look like