Power Electronics MCQs

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1. Which device is not commonly used in power electronic circuits?





2. What is the primary function of a rectifier in power electronics?





3. Which type of rectifier has the lowest average output voltage?





4. In a three-phase full-wave rectifier, how many diodes conduct at any given time?





5. A TRIAC is a type of:





6. The term ‘chopping’ in power electronics refers to:





7. Which semiconductor device has the highest switching speed?





8. In a buck converter, the output voltage is _____ than the input voltage.





9. A flyback converter is typically used for:





10. What does PWM stand for in the context of power electronics?





11. In a boost converter, the output voltage is _____ than the input voltage.





12. The process of reducing harmonic distortion in power electronic circuits is called:





13. Which type of semiconductor device is typically used for switching high currents in power electronics?





14. What is the typical function of a snubber circuit in power electronics?





15. Which of the following is a passive component used in power electronic circuits?





16. The process of rectification is achieved using:





17. A buck-boost converter can:





18. The efficiency of a power electronic converter is typically calculated as:





19. Which type of semiconductor device requires a gate signal to turn on?





20. A freewheeling diode is used in _____ converters to provide a path for the inductive load current.





21. A resonant converter is known for its:





22. What is the primary advantage of using IGBTs over BJTs in power electronics?





23. Which power semiconductor device has the highest input impedance?





24. The term ‘commutation’ in power electronics refers to:





25. Which of the following is a disadvantage of using a half-wave rectifier compared to a full-wave rectifier?





26. A phase-controlled rectifier operates by controlling the:





27. A DC-DC converter that provides galvanic isolation between input and output is:





28. Which of the following power electronic devices does not have a reverse blocking capability?





29. The snubber circuit is used to:





30. Which power electronic device is typically used in applications requiring fast switching speeds and low conduction losses?





31. The term ‘soft switching’ in power electronics refers to:





32. A buck converter operating in continuous conduction mode:





33. A Schottky diode is preferred over a regular silicon diode in power electronics due to its:





34. A boost converter requires a _____ load to operate correctly.





35. Which of the following is not a type of DC-DC converter?





36. Which of the following is a disadvantage of using an IGBT over a MOSFET in power electronics?





37. The process of ensuring smooth transitions in current and voltage waveforms when switching semiconductor devices is known as:





38. Which of the following is a common application of a voltage-source inverter (VSI)?





39. A snubber circuit typically consists of:





40. The term ‘modulation index’ is used to describe the:





41. Which of the following power electronic devices can be turned off by reducing the current below a certain level?





42. A single-phase full-bridge inverter can produce:





43. Which of the following is a characteristic of a resonant converter?





44. The process of maintaining a constant output voltage in a buck converter is achieved by:





45. A voltage-source inverter (VSI) is commonly used to convert:





46. Which type of semiconductor device has a positive temperature coefficient of on-state voltage?





47. Which of the following statements about IGBTs is true?





48. A buck-boost converter can invert the polarity of the output voltage when:





49. Which of the following statements about a full-bridge inverter is true?





50. In power electronics, a push-pull converter is commonly used for:





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