Dive into the dynamic world of Power Electronics with our comprehensive collection of multiple-choice questions and answers. Whether you're a student studying electrical engineering, an engineer designing power conversion systems, or simply fascinated by the control and conversion of electrical power, our meticulously curated selection covers a wide range of topics. Explore fundamental concepts such as power semiconductor devices, converters, inverters, and their applications in renewable energy, electric vehicles, and industrial systems. With our user-friendly interface and detailed explanations, mastering the complexities of power electronics has never been more engaging and accessible. Start your journey towards understanding the backbone of modern electrical systems today!"
1. A crowbar is a circuit which is used to protect a
2. A diac has........................terminals
3. A diac has....................pn junctions
4. A diac has ................... semiconductor layers
5. A diac is simply.....................
6. A diac is turned on by ...................
7. A full wave rectifier with resistive load produces
8. A triac can pass a portion of ..................... half-cycle through the load
9. A triac has .................... semiconductor layers
10. A Triac has three terminals viz.....................
11. A triac is a ................ switch
12. A triac is equivalent to two SCRs .......................
13. A UJT has ....................
14. A UJT is sometimes called................ diode
15. AC power in a load can be controlled by using
16. After peak point, the UJT operates in the ................... region
17. An SCR can be used
18. An SCR is made up of silicon because
19. Between the incoming and outgoing devices in voltage commutation
20. Between the peak point and the valley point of UJT emitter characteristics we have ....................... region
21. Double fourier series analysis of PWM is
22. During the commutation period in 3 phase converter, overlap time is
23. For a buck converter to reduce the conduction losses in diode
24. For bidirectional operation of converters
25. For similar carrier and modulating signals, the line current used in CSI is
26. For sweptfrequency measurements, the input impedance of the mismatched transmission line would vary with frequency as the electrical length ofthe transmission line would
27. Harmonics in 3 phase inverters can be reduced by using
28. In a 3 phaseCSI, if the required line output voltages are balanced and 120 degreeout of phase, then the chopping angles are used to eliminate only theharmonics at frequencies
29. In a load commutated DC - DC chopper, the capacitor has a
30. In a three phase converter, the number of notches per cycle is
31. In a UJT, the p-type emitter is ........................ doped
32. In bipolar modulation, the carrier is symmetric about zero with amplitude equal to Cm, the PWM output
33. In current commutated DC - DC choppers, the voltage spike appears across the load when
34. In EMCsignal, the source delivers maximum power to the input of transmissionline when the transmission line input impedance
35. In radiative coupling, the emitter radiation field
36. In single phase VSI, the harmonic which is not present is
37. LISN is a device used to measure conducted emissions. LISN stands for
38. Power electronics essentially deals with control of a.c. power at .....................
39. Silicon controlled rectifier can be turned on
40. Single phase VSI are mainly used in
41. The advantage of using free - wheeling diode in half controlled bridge converter is that
42. The conduction losses in IGBT is
43. The device that does not have the gate terminal is ............................
44. The device that exhibits negative resistance region is .........................
45. The effects of EMI can be reduced by
46. The input current waveform of a bridge controlled rectifier when the load is perfectly filtered is
47. The most suited gate pulses given to the AC regulator with R - L load can be in the form of
48. The normal way to turn on a diac is by ...........................
49. The output power of the cascaded amplifier-attenuator system can be determined using
50. The power MOSFET device is a
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