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

Q. The turn on characteristics of a power transistor can be assumed to be linear, as shown in the below figure . During turn on time T, voltage reduces linearly from V to 0 and current rises linearly from 0 to I. The energy loss during time T is

View solution

Q. The circuit in figure is for

View solution

Q. If 0.5 T is the time period of oscillations and Toff is the time between turn off of one thyristor and turn on of second thyristor, the frequency of output f of a series inverter is

View solution

Q. In auxiliary commutated chopper fed by voltage V and having L and C commutating elements, the peak value of capacitor current is

View solution

Q. A single phase half wave converter is feeding-a resistor load. The input voltage is v = Vm sin ωt. If firing angle is zero, the output dc voltage Vdc and output rms voltage Vrms respectively

View solution

Q. A single phase converter is fed by a source having an inductance L. If load current is I₀, the decrease in output voltage due to overlap is

View solution

Q. In a full bridge inverter fed by a battery of voltage V, the rms value of fundamental component of output voltage is

View solution

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

View solution

Q. A capacitor C farads is charged to a voltage V. It discharges through a thyristor, a diode and an inductance L. The peak current in the circuit is

View solution

Q. A dc chopper feeds an RLE load and has a duty cycle of 1. The load current will be such that

View solution