Power Quality MCQs

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1. What is the acceptable voltage variation limit for sensitive electronic equipment as per IEEE standards?





2. Harmonics in power systems are primarily caused by:





3. The total harmonic distortion (THD) is a measure of:





4. Which power quality issue is characterized by a brief reduction in voltage?





5. A voltage sag lasting from a few milliseconds to a few seconds is typically caused by:





6. What type of power quality issue results in a sudden increase in voltage?





7. A power quality issue that can be caused by lightning strikes or switching operations is:





8. Which of the following devices is commonly used to mitigate voltage sags?





9. The main purpose of a UPS (Uninterruptible Power Supply) in relation to power quality is to:





10. Which parameter is measured to evaluate the quality of AC power?





11. A power quality problem that can result from rapid changes in load currents is:





12. The flicker effect in lighting systems is primarily caused by:





13. The rapid change in voltage lasting for a few microseconds to milliseconds is called:





14. Which type of device is used to suppress or mitigate transients in power systems?





15. The phenomenon where the waveform of the current does not follow the voltage waveform is known as:





16. What is the typical frequency range for power system harmonics?





17. A sudden loss of voltage for a short duration is known as a:





18. The presence of which of the following is a common cause of harmonic distortion?





19. The ratio of the real power to the apparent power in a power system is known as:





20. A prolonged increase in voltage beyond the normal level is known as:





21. In a power quality context, what does “EMI” stand for?





22. A device that can help reduce voltage variations and regulate the voltage supplied to sensitive equipment is called a:





23. A sudden, short-duration increase in voltage is known as a:





24. Which power quality issue is most likely to cause overheating and premature failure of electrical equipment?





25. The measure of how effectively power is being used in a system is indicated by:





26. A device used to smooth out voltage fluctuations and protect sensitive equipment from power surges is called a:





27. In a power system, the term “brownout” refers to:





28. Which of the following is not a typical cause of voltage sags?





29. The term “crest factor” in power quality refers to the ratio of:





30. A device that can help mitigate flicker in lighting systems is called a:





31. What is the main purpose of a harmonic filter in a power system?





32. A sudden increase in voltage above normal levels that lasts for a short duration is known as a:





33. A power quality issue characterized by a steady-state overvoltage condition is known as a:





34. What type of load is typically responsible for generating harmonic currents in a power system?





35. The effect of harmonic distortion on power systems can include:





36. The term “power factor” indicates the:





37. A power quality issue that can cause visible fluctuations in lighting brightness is:





38. In power systems, harmonic currents can result in:





39. A device that maintains a constant output voltage despite fluctuations in input voltage is called a:





40. The phenomenon where there is a sudden, complete loss of voltage for a short duration is known as a:





41. Which type of power quality issue is characterized by a continuous overvoltage condition?





42. A device that can provide temporary power during a mains power failure is:





43. The term “power quality” refers to the:





44. A device that can help maintain a stable voltage supply to sensitive equipment during fluctuations is called a:





45. A transient voltage surge suppressor is designed to protect against:





46. The term “flicker” in power quality refers to:





47. A device used to correct power factor in industrial applications is called a:





48. The presence of which of the following can indicate poor power quality?





49. A device that converts DC power into AC power during a mains power failure is called a:





50. Which parameter indicates the efficiency with which electrical power is converted into useful work?





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