Q. A thyristor needs protection against

View solution

Q. Two semiconverters are connected in series to form a single phase series converter. The input v = Vm sin ωt and α1 = α2 are the firing angles of the two converters. If α1 = α2 = 0, the dc output voltage is

View solution

Q. A single phase half wave controlled rectifier circuit is feeding on RL load. The circuit has a freewheeling diode. The input voltage is v = Vm sin ωt. If I0 is the load current during the conduction of freewheeling diode, the KVL equation during the conduction of free wheeling diode is

View solution

Q. The symbol in figure is for

View solution

Q. In the below figure the rms voltage across each half of secondary is 200 V. The peak inverse voltage across each of thyristor is

View solution

Q. In a single phase full bridge converter (B - 2 connection), the input voltage is v = Vm sin ωt. The output dc voltage for resistive load

View solution

Q. In the below figure, the average value of load current is 15 A. The load is highly inductive. The peak value of thyristor current is

View solution

Q. An n pulse rectifier is fed by a source having an inductance L. If load current is I₀, the voltage drop due to overlap is

View solution

Q. A 3 phase fully controlled bridge converter is fed by a 3 phase system having phase voltage v = Vm sin ωt. The firing angle is a. The dc output voltage is

View solution

Q. In the circuit of figure, the load current when thyristor is off

View solution

Q. In a step down chopper using time ratio control, the input voltage is V and duty cycle is α. The load is purely resistive having resistance R. The average and rms load currents are

View solution

Q. The symbol in figure is for

View solution

Q. If a step down chopper is fed by a dc voltage V with Ton and Toff are on and off periods then following is

View solution

Q. In the circuit of figure, the waveshape of load current when thyristor conducting is

View solution

Q. In figure, thyristor Th is in off state. When thyristor is turned on, the peak thyristor current can be

View solution

Q. In a single phase full wave converter (M-2 connection) feeding on R-L load the input voltage is v = Vm sin ωt. The expression for rms output voltage is

View solution

Q. A dc chopper is feeding an RLE load. The condition for maximum ripple is

View solution

Q. The symbol in figure is for

View solution

Q. The circuit in figure is for

View solution

Q. The symbol in figure is for

View solution