251. A NAND gate has 3 inputs and one output. The number of thyristors required for this gate are
252. Which of these devices is used in relaxation oscillator?
253. Who called Muhammed Bin Tughlaq, ‘Wisest Fool’ in Indian History?
254. In a single phase semiconverter feeding a highly inductive load, the load current is
255. Two thyristors of the same rating and specifications
256. A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the starting torque is 100 N-m. At 25 Hz, the starting torque
257. In a three phase to single phase full wave bridge cycloconverter, the number of thyristors is
258. The pioneer of the Reform Movement in Bengal in the 19th century was?
259. In a cycloconverter it is possible to vary
260. A single phase full bridge inverter for R-L loads needs
261. In the basic series inverter circuit, the source current has
262. Thyristors connected in series need static and dynamic stabilizing circuits.
263. In a controlled rectifier a freewheeling diode is necessary if the load is
264. For an illumination control circuit it is advisable to use a matched TRIAC-DIAC pair.
265. ‘To beat the air’ approximately means:?
266. Assertion (A): An ac regulator uses natural commutationReason (R): An ac regulator can be used for static on load tap changing of transformer.
267. When a UJT is used as a relaxation oscillator the current should be
268. In auxiliary commutated chopper, the charging and discharging time of capacitor
269. Which chopper circuit uses saturable reactor?
270. A thyristor circuit is feeding an R-L load. The turn on time can be reduced by
271. A single phase semiconverter is supplying RLE load and has a freewheeling diode across the load. The firing angle is a . The freewheeling diode conducts for
272. When your friend is not an optimistic person , you call him ..........?
273. In a single phase full wave regulator feeding a resistive load, the average current over one full cycle
274. Two single phase semi-converters are connected in series to form a series converter. The input is v = Vm sin ωt and a 1, a 2 are the firing angles. If a 1 = 0, the dc output voltage is
275. The total number of leads in MOS controlled thyristor is