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About Power Electronics
Following are some of the multiple choice questions on the Power Electronics with answers that will help the students in developing their knowledge.
Power Electronics MCQ
13. The process of commutating a SCR by applying a reverse voltage to an SCR through a previously charged capacitor is called as
20. The gate-source voltage at which the ________________ layer in a MOSFET is formed is called the ________________ voltage.
21. The minimum frequency of the output voltage harmonic in a single phase fully controlled bridge converter is _________ the input supply frequency.
22. The Gate-Source capacitance of a MOSFET is the ________________ among all three capacitances.
23. The Gate-Drain transfer capacitance of a MOSFET has large value in the ________________ region and small value in the ________________ region.
24. For the same load resistance as the vgE of an IGBT is increased it enters __________________ region.
25. An IGBT has small __________________ temperature coefficient of on state voltage drop.
26. From the input side the IGBT behaves essentially as a __________________.
27. A single phase half wave controlled converter always operates in the ________ conduction mode.
29. The input displacement factor of a single phase fully controlled bridge converter in the continuous conduction mode is equal to the cosine of the ________ angle.
30. In the discontinuous conduction mode the load current remains __________ for a part of the input cycle.
31. In the continuous conduction mode if the firing angle of the converter is increased beyond _________ degrees the converter operates in the _______ mode.
32. A half controlled converter has better output voltage ___________________ compared to a fully controlled converter.
33. For the same firing angle and input voltage the half controlled converter gives ___________________ output voltage form factor compared to a fully controlled converter.
34. At the boundary between continuous and discontinuous conduction the value of the output current at ωt = α is ___________________.
35. Single phase half controlled converters are most suitable for loads requiring ___________________ voltage and current.
36. In a three phase fully controlled converter each device conducts for an interval of __________ degrees.
37. The input ac current of a three phase fully controlled converter contains only _________ harmonics but no _________ harmonic.
38. In ___________ current dual converter only one converter conducts at any time.
39. The input current of a three phase half controlled converter does not have ________________ cycle symmetry.
40. Length of the overlap period depends on the valve of the source inductance and load ______________
44. In case of a constant frequency system, Ton = (1/4)T. If the chopping frequency 2 kHz, find the value of Toff.
46. Find the output voltage for a step-up chopper when it is operated at a duty cycle of 50 % and Vs = 240 V.
47. In dc choppers, the waveforms for input and output voltages are respectively
48. If the chopper frequency is 200 Hz and on time is 2 ms, then the duty ratio would be
50. 1. In case of three-phase dual converter, one of the converter circuits is fired at an angle of 60°. For both the converter circuits to have equal average output voltage, what is the value of the firing angle for the other converter circuit?
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