Power Semiconductor Devices MCQs

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1. What is the main advantage of a switching power supply compared to a linear power supply?





2. Which component in a switching power supply is responsible for converting DC voltage to high-frequency AC voltage?





3. The duty cycle of a switching power supply refers to:





4. Which topology is commonly used in low-power switching power supplies due to its simplicity?





5. The term “ripple voltage” in a switching power supply refers to:





6. Which parameter is crucial for determining the maximum current output of a switching power supply?





7. In a forward converter topology, which component is used to store energy during the switching cycle?





8. The purpose of the snubber circuit in a switching power supply is to:





9. Which type of switching power supply topology typically provides galvanic isolation between input and output?





10. Which control method is commonly used in modern switching power supplies to regulate output voltage?





11. The switching frequency of a power supply is primarily determined by:





12. A switching power supply operates in discontinuous conduction mode (DCM) when:





13. Which parameter is NOT typically a disadvantage of switching power supplies?





14. The main advantage of a flyback converter over a forward converter is:





15. Which component is essential for energy storage and transfer in a boost converter?





16. The efficiency of a switching power supply is calculated as:





17. Which topology is known for its bidirectional capability, making it suitable for applications requiring both step-up and step-down conversions?





18. In a half-bridge converter, how many switches are used?





19. The term “soft start” in switching power supplies refers to:





20. Which type of control loop is used to regulate the output voltage of a switching power supply?





21. The main advantage of a resonant converter compared to traditional switching converters is:





22. Which type of switching power supply is typically used in battery-operated devices to step up or step down the voltage?





23. The primary purpose of the input filter in a switching power supply is to:





24. Which parameter is critical in determining the maximum output power of a switching power supply?





25. Which component is used to rectify the AC output of the transformer in a flyback converter?





26. Which topology allows for seamless transition between step-up and step-down conversions without a change in polarity?





27. The term “load regulation” in a switching power supply refers to:





28. Which parameter indicates the ability of a switching power supply to maintain a constant output voltage with varying input voltage?





29. A buck-boost converter is capable of:





30. Which control method is used in resonant converters to achieve high efficiency?





31. The term “power factor correction (PFC)” in switching power supplies refers to:





32. Which topology is preferred in applications requiring high power output due to its ability to handle large currents?





33. Which component in a switching power supply stores energy during the on-time of the switching transistor?





34. The primary advantage of a phase-shifted full-bridge converter is:





35. Which type of feedback is essential for stable operation in a switching power supply?





36. The term “duty cycle” in a switching power supply refers to:





37. In a SEPIC converter, the primary benefit is:





38. The output capacitor in a switching power supply is primarily used to:





39. In a switching power supply, what is the main function of the control loop?





40. A common disadvantage of switching power supplies compared to linear power supplies is:





41. The term “EMI” in the context of switching power supplies stands for:





42. Which control technique helps to improve the transient response of a switching power supply?





43. In a resonant converter, the term “resonant” refers to:





44. Which component in a switching power supply is most affected by thermal stress?





45. The primary purpose of a rectifier in a switching power supply is to:





46. Which control method is commonly used for high-precision applications in switching power supplies?





47. The main advantage of using a full-bridge converter is:





48. A critical factor affecting the stability of a switching power supply is:





49. In a boost converter, the energy is stored in which component during the switching cycle?





50. Which topology is characterized by the use of a transformer to provide isolation and voltage conversion in a single stage?





51. The primary function of the output filter in a switching power supply is to:





52. Which type of converter topology would be ideal for a scenario requiring both high power density and isolation?





53. The main disadvantage of using a linear power supply compared to a switching power supply is:





54. In a switching power supply, “duty cycle” directly influences:





55. The term “peak current limiting” in a switching power supply refers to:





56. The purpose of a current sense resistor in a switching power supply is to:





57. Which type of converter is used when precise voltage regulation is required in low-power applications?





58. In a switched-mode power supply, what is the role of a “feedback loop”?





59. Which type of switching power supply topology is known for its ability to provide multiple outputs with high efficiency?





60. The term “dead time” in a switching power supply refers to:





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