203. The turn-off time of thyristor is 30 msec at 50°C. Its turn-off time at 100° is A. same B. 15 msec C. 60 m sec D. 100 msec View Answer: Answer: Option CSolution: 204. The peak and valley currents of the PUT are typically ___________ those of a similarly rated UJT. 205. What is a solid state equivalent of a gas filled triode? 206. The method(s) for turning off an SCR is (are) categorized as ___________. 207. In a certain UJT rB1 is 2.5 kΩ and rB2 = 4 kΩ. What is the intrinsic standoff ratio?A. 0.61538 B. 0.38461
C. 2.6 D. 0.8125 View Answer: Answer: Option BSolution: 208. When SCR starts conducting, then __________ losses all control. 209. You have the schematic diagram of several types of circuits. Which of these circuits most likely uses a triac? 210. Determine RB1 for a silicon PUT if it is determined that h = 0.84, VP = 11.2 V, and RB2 = 5 kΩ.211. Which of the following devices does not have a cathode terminal? A. SCR B. SCS C. TRIAC D. Shockley diode View Answer: Answer: Option CSolution: 212. The UJT operates in what region after peak point? 213. What is basically a two-terminal parallel-inverse combination of semiconductor layers that permits triggering in either direction? 214. Which device does not have a gate terminal? 215. The four-layer devices with a control mechanism are commonly referred to as ___________. A. thyristors B. transistors C. diodes D. None of the above View Answer: Answer: Option ASolution: 216. What is that voltage above when the SCR enters the conduction region?
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- Fall '19