Power Electronics MCQs

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1. In a single-phase full-bridge rectifier, the frequency of output voltage ripple is:





2. The device used for switching in a buck converter is typically:





3. In a DC chopper circuit, if the duty cycle of the switch is 0.6, the average output voltage is:





4. The main advantage of using an IGBT over a MOSFET in power electronics applications is:





5. A freewheeling diode is used in a:





6. The purpose of a snubber circuit in power electronics is to:





7. The power factor of a fully controlled bridge rectifier (with resistive load) operating at firing angle α is:





8. A cycloconverter converts:





9. In a three-phase full-bridge inverter, each thyristor or IGBT is fired:





10. A step-up chopper is used when:





11. The snubber circuit across a power electronic switch is used to:





12. The function of a freewheeling diode in a controlled rectifier is to:





13. The firing angle of a thyristor in a single-phase half-wave rectifier is 30 degrees. The average output voltage is:





14. In a PWM inverter, the width of the PWM pulses remains constant, and the:





15. Which of the following is true about the output voltage waveform of a half-wave rectifier?





16. In a three-phase bridge rectifier, the average DC output voltage is approximately:





17. Which of the following devices has the highest switching speed?





18. The power electronics device that combines the high input impedance of MOSFETs and the low on-state power losses of bipolar junction transistors is called:





19. The primary function of a snubber circuit in a power electronic circuit is to:





20. A unidirectional device that allows current to flow in only one direction and blocks current in the reverse direction is called:





21. In a buck-boost converter, the output voltage is:





22. The main advantage of a resonant converter over a traditional PWM converter is:





23. Which of the following topologies is commonly used for grid-tied solar inverters?





24. The voltage drop across a conducting thyristor or IGBT when it is in the on-state is called:





25. Which of the following is a disadvantage of using MOSFETs in high-power applications compared to IGBTs?





26. The main function of a snubber circuit in a power electronic switch is to:





27. A rectifier converts:





28. In a single-phase half-wave rectifier, if the load resistance is doubled, the output DC voltage will:





29. A step-up chopper is used to:





30. In a three-phase full-wave rectifier, the output voltage ripple frequency is:





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





32. The output waveform of a buck converter is:





33. Which of the following is a disadvantage of a flyback converter?





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





35. A controlled rectifier is also known as:





36. Which of the following converters requires energy storage elements such as capacitors or inductors?





37. The primary advantage of using an H-bridge inverter is:





38. In a boost converter, the output voltage is:





39. The output of a PWM inverter typically has:





40. The purpose of a heat sink in power electronic devices is to:





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