Power System Protection and Relaying MCQs

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1. Which of the following is the primary objective of power system protection?





2. The time-current characteristic of a protective relay is also known as:





3. In an overcurrent relay, the time of operation ________ with increasing fault current.





4. Distance protection relays primarily operate based on:





5. The term “reach” in distance protection relays refers to:





6. Which type of relay is used for the protection of transmission lines against faults?





7. In directional overcurrent relays, operation occurs when:





8. Buchholz relay is used for the protection of:





9. In a generator protection scheme, loss of excitation protection is used to:





10. The primary function of a synchrocheck relay is to:





11. A negative sequence relay is used to protect against:





12. In transformer differential protection, which principle is typically used?





13. A backup protection relay is used to:





14. Which relay detects faults in the rotor circuit of a synchronous machine?





15. The term “zone of protection” refers to:





16. In a busbar protection scheme, which type of relay is commonly used?





17. A static relay differs from an electromagnetic relay in that it:





18. An underfrequency relay is used to protect against:





19. A surge diverter is used in power systems to protect against:





20. The purpose of a supervisory control and data acquisition (SCADA) system in protection is to:





21. In which type of protection scheme does the relay operate based on the sequence of events and the time at which they occur?





22. A sensitive earth fault relay is used to protect against:





23. In transformer protection, which relay detects faults between turns of the same winding?





24. The primary function of a differential relay is to protect against:





25. A load shedding scheme is used to:





26. In which protection scheme does the relay operate based on the ratio of the voltage to the current?





27. An auto-reclosing scheme is used primarily to:





28. Which of the following is not a type of distance relay?





29. Which protection scheme is used to protect motors against overcurrents and ground faults?





30. A relay which operates when the power factor of the system falls below a preset value is called:





31. The ANSI device number 50 refers to:





32. A fault locator relay is used to:





33. Which protection scheme is used to protect a generator against loss of field?





34. A relay that operates when the voltage in one phase of a three-phase system exceeds the voltage in the other phases is called:





35. An arc protection relay is used to detect:





36. In a generator protection scheme, a reverse power relay operates when:





37. The purpose of a surge arrester in a power system is to protect against:





38. A differential protection relay will not operate for:





39. A relay that operates when the impedance measured from the relay location to the fault point falls below a certain value is known as:





40. A relay that operates when the current in a circuit exceeds a predetermined value is called:





41. The IEEE device number 87 refers to:





42. Which protection scheme is used for the protection of a transmission line against overvoltages caused by lightning?





43. An under-voltage relay is used to protect against:





44. In transformer protection, which relay provides protection against faults external to the transformer windings?





45. The ANSI device number 67 refers to:





46. In a generator protection scheme, a loss of field relay is used to protect against:





47. A relay that operates when the current flowing in opposite directions in two conductors exceeds a predetermined value is called:





48. The term “inrush current” refers to:





49. In a protection scheme, the term “discrimination” refers to:





50. An auxiliary relay in a protection scheme is used to:





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