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Power Systems –
High Difficulty
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LET’S PRACTICE!
#1. Distribution automation includes:
#2. Locational marginal price (LMP) represents:
#3. Total demand distortion (TDD) differs from THD in that TDD uses:
#4. Harmonic resonance frequency in power systems depends on:
#5. A 60 Hz generator has inertia constant H = 5 MJ/MVA. If accelerating power is 0.2 pu, rotor acceleration is:
#6. Volt-Watt control for inverters:
#7. The duck curve problem in grids with high solar refers to:
#8. Weak grid challenges for inverters include:
#9. Hosting capacity of a feeder refers to:
#10. Battery energy storage system (BESS) round-trip efficiency is typically:
#11. The ramp rate of a generator limits:
#12. The frequency nadir after generation loss depends on:
#13. Hybrid active filters combine:
#14. Grid-forming vs grid-following inverter: grid-forming:
#15. Ancillary services include:
#16. The difference between AMI and AMR is:
#17. Motor torque pulsation from harmonics occurs at:
#18. For a 100 MVA transformer with X = 10% on its own base, the reactance on 1000 MVA system base is:
#19. Positive sequence impedance of a transmission line equals:
#20. A 3-phase system has VL = 480V and line current 100A at pf = 0.85 lagging. The reactive power is:
#21. Anti-islanding protection ensures:
#22. The CVR factor represents:
#23. The minimum synchronous inertia requirement in power systems:
#24. Load flow using Newton-Raphson method converges in:
#25. The IEEE 1547 standard addresses:
#26. Day-ahead market clearing occurs:
#27. The effect of harmonics on transformers includes:
#28. The IEEE 519 TDD limit depends on:
#29. Security constrained economic dispatch includes:
#30. Power quality meters measure:
#31. Solar PV generation characteristics include:
#32. K-factor for transformers indicates:
#34. The sequence impedances for rotating machines satisfy:
#35. Flicker in power systems is caused by:
#36. For a line-to-line fault, zero sequence current is:
#37. For economic dispatch, the incremental cost of all online generators at optimum is:
#38. Synthetic inertia from wind turbines is provided by:
#39. Subsynchronous control interaction (SSCI) involves:
#40. Volt-VAR optimization on distribution systems:
#41. Microgrid operation in islanded mode requires:
#42. For long lines (>320 km), stability limit is typically:
#44. Fast frequency response (FFR) acts within:
#45. Advanced metering infrastructure (AMI) provides:
#46. Zero sequence impedance of overhead line is typically:
#47. Pumped hydro storage efficiency is approximately:
#48. Volt-VAR control for inverters:
#49. The compensation factor for a UPFC can control:
#50. Real-time market settlement interval is typically:
#51. Short circuit ratio (SCR) at inverter point of connection:
#52. For short lines (<80 km), thermal limit is typically:
#53. Conservation voltage reduction (CVR) works by:
#54. A transmission line has Z = 10+j40 Ω. The power angle δ for 100 MW transfer at 138 kV both ends is approximately:
#55. Primary frequency control responds within:
#56. Subsynchronous resonance (SSR) can occur between:
#57. A transformer with 5% impedance and 1000 kVA rating has fault current capability of:
#58. IEEE 1159 addresses:
#59. A synchronous generator has Xd = 1.0 pu. The subtransient fault current for 3-phase fault at terminals (1.0 pu voltage) is:
#60. Secondary frequency control (AGC) responds within:
#61. Active harmonic filters work by:
#62. The 3rd harmonic in three-phase systems is:
#63. The Pst (short-term flicker) is measured over:
#64. Total harmonic distortion (THD) is calculated as:
#65. Wind generation variability is addressed by:
#66. Optimal power flow (OPF) includes:
#67. Power oscillation damping (POD) function in FACTS devices:
#68. The Gauss-Seidel load flow method compared to Newton-Raphson:
#69. The capacity market ensures:
#70. A transmission line surge impedance of 400 Ω at 345 kV has SIL of:
#71. For single line-to-ground fault, the sequence networks are connected in:
#72. For voltage stability, the critical point on PV curve is where:
#73. The maximum loadability of a transmission line is limited by:
#74. A CCGT plant compared to simple cycle gas turbine has:
#75. Capacitor failure from harmonics is due to:
#76. The capacity factor of a power plant is:
#77. Nuclear plants typically operate as:
#78. The critical clearing angle for a generator depends on:
#79. A 3-phase, 480V system supplies a balanced Y-load of 10Ω/phase. The line current is:
#80. The per-unit impedance of a transformer remains unchanged when:
#81. A synchronous motor operating at leading power factor acts as:
#82. The inrush current of a transformer at energization can be:
#83. Economic dispatch problem minimizes:
#84. The X/R ratio of a transmission line affects:
#85. A 100 MVA, 13.8kV generator has a synchronous reactance of 1.2 p.u. In ohms, Xs is:
#86. The critical clearing angle in transient stability is:
#87. Power factor correction capacitors are connected in:
#88. The short-circuit ratio (SCR) of a synchronous machine is:
#89. In a 3-phase fault, the positive, negative, and zero sequence currents are:
#90. The surge impedance loading (SIL) of a transmission line represents:
#91. Load flow analysis uses:
#92. The power angle δ in a synchronous generator relates:
#93. Capacitor banks for power factor correction are rated by:
#94. The Ferranti effect causes:
#95. An autotransformer compared to two-winding transformer of same rating has:
#96. The complex power S = P + jQ, where Q positive indicates:
#97. Skin effect in conductors increases:
#98. The power transferred between two buses is maximum when phase angle difference is:
#99. Negative sequence currents in rotating machines cause:
#100. A 50 Hz transformer is operated at 60 Hz (same voltage). The core flux:
