226. Assertion (A): A DIAC has four layers but only two terminals. Reason (R): A DIAC can conduct in both directions.
227. In a 3 phase full converter, the instantaneous output voltage can have negative part if
228. In a single phase full wave ac regulator using two thyristors only, the gate circuits of the two thyristors
229. The circuit in figure is for
230. A fully controlled bridge converter is feeding an RLE load. For some circuit conditions firing angle is 47°. If connections of battery are reversed, the firing angle is likely to be
231. In a single phase half wave converter feeding resistive load and full wave converter (M - 2 connection) feeding a resistive load the circuit conditions are similar. The firing angle is a . Then the waveshapes of voltages across thyristors
232. In a 3 phase full converter feeding a highly inductive load, the average load current is 150 A. The peak current through thyristor is
233. Write an example of ‘Blue green algae’?
234. The main utility of SCR is due to
235. In a single phase full wave ac regulator the firing angles during both half cycles are equal.
236. In a 3 phase full wave regulator feeding a star connected resistance load, firing angle is 75°. Then the number of thyristors conducting at one time is
237. 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
238. A single phase half bridge inverter required to feed R-L loads needs
239. Typical values of for an SCR are in the range of
240. When a dc chopper feeds an RLE load, the load current, during steady state operation
241. In a single phase full wave ac regulator feeding R-L load, the gate pulses
242. In a semi converter feeding a resistive load,
243. In a single phase semi-converter the number of thyristors is
244. A dc chopper is feeding an RLE load. The current can become discontinuous if
245. Which of these commutation methods uses two leads?
246. A single phase half wave rectifier is feeding a resistive load. As firing angle is increased
247. A cycloconverter for single phase operation has
248. A chopper is a high efficiency circuit.
249. The difference between resonant commutation and self commutation is