202. In figure, thyristor Th is in off state. When thyristor is turned on, the peak thyristor current can be
203. HVDC systems are preferable for only long distances.
204. Surge current rating of an SCR is
205. Which of the following devices has metal-silicon junction?
206. Who is known as ‘Don’ in Cricket World?
207. A dc chopper is feeding an RLE load. The condition for maximum ripple is
208. In a series inverter
209. When a power diode is conducting, the voltage drop across it is about
210. The Cripps Mission visited India in?
211. A string of series connected thyristors needs equalising circuit to
212. A surge voltage
213. The minimum gate current which can turn on SCR is called :
214. The total number of leads in SUS, SBS and SCS respectively are
215. Which of these devices can conduct in both directions?
216. Assertion (A): A half wave controlled rectifier has poorer efficiency and higher ripple factor than a full wave controlled rectifier.Reason (R): The use of a freewheeling diode in half wave controlled rectifier circuit improves the waveform of load current and circuit power factor.
217. A 3 phase dual converter consists of
218. Which inverter circuit uses coupled inductors?
219. When an SCR is in forward blocking mode, the applied voltage
220. In sinusoidal PWM for inverters the width of different pulses are not the same.
221. A class D chopper
222. The efficiency of a chopper circuit is about
223. If the frequency is less than the damped frequency in a series- inverter
224. The output frequency of a cycloconverter can be changed by changing the firing angle.