21. When the temperature increases, the inter-base resistance (RBB) of a UJT ___________. A. Increases B. Decreases C. Remains the same D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
22. Power electronics essentially deals with control of a.c. power at ___________. A. Frequencies above 20 kHz B. Frequencies above 1000 kHz C. Frequencies less than 10 Hz D. 50 Hz frequency Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option D No explanation is given for this question Let's Discuss on Board
23. A DIAC is ___________ switch. A. An a.c. B. A d.c. C. A mechanical D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
24. A diac is simply ___________. A. A single junction device B. A three junction device C. A triac without gate terminal D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
25. A triac has ___________ semiconductor layers. A. Two B. Three C. Four D. Five Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
26. A diac has ___________ semiconductor layers A. Three B. Two C. Four D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
27. When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ___________ A. Remains the same B. Is decreased C. Is increased D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option B No explanation is given for this question Let's Discuss on Board
28. The triac is ___________. A. Like a bidirectional SCR B. A four-terminal device C. Not a thyristor D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option A No explanation is given for this question Let's Discuss on Board
29. A triac is equivalent to two SCRs ___________. A. In parallel B. In series C. In inverse-parallel D. None of the above Answer & Solution Discuss in Board Save for Later Answer & Solution Answer: Option C No explanation is given for this question Let's Discuss on Board
