Transmission, Distribution & Protection of Electrical Power Systems MCQs – DAE Electrical Engineering

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1. The main function of a transmission system is to:




2. High voltage is used in transmission to:




3. The typical voltage levels for high voltage transmission lines are:




4. Transmission lines are usually made of:




5. Corona loss occurs due to:




6. The main purpose of a substation is to:




7. A typical transmission system consists of:




8. The main advantage of three-phase transmission over single-phase is:




9. The characteristic impedance of a transmission line depends on:




10. The main cause of voltage drop in transmission lines is:




11. A busbar in a substation is used for:




12. A protective relay operates to:




13. The main purpose of a circuit breaker is:




14. Overcurrent protection is provided by:




15. The main types of faults in power systems are:




16. Earth fault occurs when:




17. Distance protection relays operate based on:




18. The main function of a lightning arrester is to:




19. Distribution lines operate at:




20. Primary distribution lines are:




21. Secondary distribution lines supply:




22. The main advantage of underground distribution is:




23. The main disadvantage of underground distribution is:




24. Protective devices for distribution systems include:




25. The type of relay that operates instantly during fault is:




26. The difference between protective relay and circuit breaker is:




27. The line-to-line voltage in a 3-phase, 415 V system is:




28. The line-to-neutral voltage in the same system is:




29. Short-circuit current depends on:




30. Power system stability refers to:




31. A neutral earthing resistor is used to:




32. A star-delta transformer connection helps in:




33. Protective relays are classified as:




34. Transmission line losses are mainly due to:




35. A bus zone protection scheme protects:




36. Protective coordination ensures:




37. A ring main distribution system is preferred because:




38. The main disadvantage of overcurrent protection alone is:




39. The operating time of a protective relay is usually:




40. Feeder protection is provided by:




41. A ring main unit (RMU) is used in:




42. The advantage of differential protection is:




43. Lightning arresters are usually connected:




44. Distribution transformers usually operate at:




45. The main purpose of a neutral in distribution systems is:




46. Surge arresters protect equipment against:




47. The main advantage of overhead distribution lines is:




48. Protective devices should operate:




49. The main function of a potential transformer is to:




50. Transmission line insulation must withstand:




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