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Power Systems –
Medium Difficulty
ARE YOU READY?
LET’S PRACTICE!
#1. CT secondary should never be:
#2. Smart grid technology includes:
#3. Corona loss in transmission lines occurs at:
#4. Differential relay protection compares:
#6. Insulation coordination involves:
#7. Contingency analysis evaluates:
#8. N-1 criterion means system must:
#9. Harmonic distortion in power systems is caused by:
#11. Short circuit analysis is used to:
#12. A three-phase fault is typically:
#13. Reduced voltage starting methods include:
#14. Phasor measurement units (PMUs) provide:
#15. Arc flash hazard analysis determines:
#16. Core losses in a transformer include:
#17. The capacity of a substation transformer is rated in:
#18. Demand factor is defined as:
#19. Symmetrical components analysis uses:
#20. Power quality issues include:
#21. IEEE 519 standard addresses:
#22. A 3-phase transformer can be connected in:
#23. The per-unit impedance of a transformer:
#24. Renewable portfolio standards require utilities to:
#25. Power system stability refers to:
#26. Electric utility rates are typically based on:
#27. Reactive power is measured in:
#28. In delta connection, line current equals:
#29. An overcurrent relay operates when:
#30. Selectivity in protection systems means:
#31. Motor starting current is typically:
#32. A circuit breaker interrupts:
#33. Diversity factor is:
#34. FACTS devices are used for:
#35. A generator converts:
#36. Tap changing transformer is used for:
#37. Protective relay senses:
#38. Voltage regulation of a transmission line is defined as:
#39. Load flow analysis determines:
#40. Burden on instrument transformers refers to:
#41. Buchholz relay is used for protection of:
#42. Shunt compensation on transmission lines:
#43. A lagging power factor indicates:
#44. Transmission line parameters include:
#45. Copper losses in a transformer are proportional to:
#46. Demand response programs:
#47. The V/Hz ratio in motor control should be:
#48. A transformer turns ratio of 10:1 is a:
#49. Capacitor banks in substations are used for:
#50. The power factor of a purely resistive load is:
#51. Automatic generation control (AGC) maintains:
#52. An induction motor runs at:
#53. A synchronous motor runs at:
#54. Neutral grounding resistor limits:
#55. The synchronous speed of a 4-pole 60 Hz motor is:
#56. An SVC (Static VAR Compensator) controls:
#57. Basic Insulation Level (BIL) is:
#58. Slip in an induction motor is defined as:
#59. A DC shunt motor has field winding connected:
#60. Real power in a balanced three-phase system is:
#61. The purpose of grounding/earthing is:
#62. The purpose of a lightning arrester is to:
#63. Per-unit system is used in power systems to:
#64. Time-current curves (TCC) are used for:
#65. State estimation in power systems:
#66. The current transformer (CT) ratio affects:
#67. In a three-phase balanced system, the neutral current is:
#68. Load factor is defined as:
#69. Distributed generation refers to:
#70. Potential transformer (PT) is used to:
#71. Single line-to-ground fault is the:
#72. HVDC transmission is preferred for:
#73. Speed control of DC motor can be achieved by:
#74. The relationship between line and phase voltage in Y-connection is:
#75. Distance relay measures:
#76. Net metering allows customers to:
#77. The swing equation relates to:
#78. To improve power factor, we typically add:
#79. Surge impedance loading (SIL) of a transmission line is:
#80. Series compensation on transmission lines:
#81. The efficiency of a transformer is typically:
#82. Harmonic filters in power systems:
#83. Regenerative braking in drives:
#84. Economic dispatch in power systems:
#85. Variable frequency drive (VFD) controls motor:
#86. Power factor is the ratio of:
#87. In a Y-connected load, line current equals:
#88. The slip of an induction motor at synchronous speed is:
#89. A step-up transformer has:
#90. Reactive power is measured in:
#91. The synchronous speed of a 4-pole motor at 60Hz is:
#92. Voltage regulation of a transformer is defined as:
#93. The per-unit system uses:
#94. A balanced three-phase load has neutral current of:
#95. The efficiency of a transformer is maximum when:
#96. In delta connection, line voltage equals:
#97. A DC motor’s speed can be controlled by:
#98. Real power in single-phase AC circuit is:
#99. The unit of apparent power is:
#100. Load tap changers (LTC) on transformers are used for:
