High Voltage Engineering MCQs

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1. What is the breakdown voltage of air at sea level?





2. Corona discharge occurs when:





3. The purpose of grading rings in a high voltage cable is to:





4. Which material is commonly used as an insulating gas in high voltage applications?





5. The breakdown in a gas occurs when:





6. Which of the following factors does NOT affect the breakdown voltage of a gas?





7. The phenomenon of corona discharge is most likely to occur when:





8. In a Van de Graaff generator, the voltage generated depends on:





9. Partial discharge in cables is an indication of:





10. Which technique is used to measure very high voltages accurately?





11. The breakdown voltage of solid insulation is affected by:





12. The purpose of surge arresters in a high voltage system is to protect against:





13. Which material is commonly used as a dielectric in high voltage capacitors?





14. The breakdown strength of a dielectric material is measured in:





15. The main cause of corona loss in high voltage transmission lines is:





16. Which of the following is a fundamental requirement for good insulation in high voltage systems?





17. The insulation resistance of a high voltage cable is measured in:





18. A corona ring is used to:





19. Which method is used to extinguish the arc in a high voltage circuit breaker?





20. Which parameter is critical in determining the safe operating voltage of a high voltage insulator?





21. Which type of insulator is commonly used in high voltage transmission lines?





22. Which material is often used as a filler in high voltage cables to improve insulation properties?





23. The main advantage of gas-insulated substations (GIS) over conventional substations is:





24. Which type of transformer is used to increase the voltage for long-distance transmission in high voltage systems?





25. What is the approximate breakdown voltage of dry air at atmospheric pressure?





26. Which device is used to measure the magnitude and polarity of DC voltages in high voltage systems?





27. The term “breakdown voltage” refers to the voltage at which:





28. Which phenomenon is responsible for power loss in high voltage transmission lines due to ionization of air?





29. Which property of a material determines how well it resists the flow of electric current?





30. What is the primary function of surge capacitors in a high voltage system?





31. Which type of material is preferred for high voltage cables to minimize losses?





32. The breakdown voltage of a gas decreases with:





33. Which parameter is crucial in determining the efficiency of corona rings?





34. What is the primary purpose of a bushing in a high voltage transformer?





35. The insulation of underground cables is commonly protected with:





36. The phenomenon of flashover occurs when:





37. Which technique is used to measure the dielectric constant of insulating materials?





38. Which device is used to detect and locate faults in high voltage cables?





39. The power loss in a high voltage transmission line due to corona effect depends primarily on:





40. The breakdown voltage of liquid dielectrics is generally higher than that of gases because:





41. Which parameter is critical in determining the withstand voltage of insulators in high voltage systems?





42. Which type of insulator is commonly used in high voltage bushings?





43. Which material is commonly used as an arc quenching medium in high voltage circuit breakers?





44. The breakdown strength of a solid insulator is primarily dependent on:





45. Which phenomenon is undesirable in high voltage systems due to its potential to cause radio interference?





46. Which technique is used to test the insulation strength of high voltage cables over a long period?





47. Which material is commonly used as an insulating varnish in high voltage applications?





48. The breakdown voltage of a gas increases with:





49. Which property of a material is crucial for determining its suitability as an insulator?





50. What is the purpose of a surge diverter in high voltage systems?





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