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Power Electronics MCQs
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Power Electronics MCQs
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25 Questions

1. The V-I characteristics for a triac in the first and third quadrants are essentially identical to those of ................... in its first quadrant
2. To turn on UJT, the forward bias on the emitter diode should be ............... the peak point voltage
3. A Triac has three terminals viz ..................
4. When the temperature increases, the inter-base resistance (RBB) of a UJT .............
5. A UJT has ...................
6. Between the peak point and the valley point of UJT emitter characteristics we have .............. region
7. After peak point, the UJT operates in the ................ region
8. A diac is ...................... switch
9. A triac is a ............. switch
10. The device that exhibits negative resistance region is ....................
11. Which of the following is not a characteristic of UJT?
12. A UJT is sometimes called ............. diode
13. When the emitter terminal of a UJT is open, the resistance between the base terminal is generally ....................
14. In a UJT, the p-type emitter is ................ doped
15. When a UJT is turned ON, the resistance between emitter terminal and lower base terminal ................
16. A diac has  .............. terminals
17. Power electronics essentially deals with control of a.c. power at ............
18. A triac is equivalent to two SCRs ..............
19. The normal way to turn on a diac is by ....................
20. A triac can pass a portion of ............... half-cycle through the load
21. The UJT may be used as ...................
22. A diac is simply ..................
23. The device that does not have the gate terminal is ...................
24. A diac has ............... pn junctions
25. A triac has ................. semiconductor layers

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