GATE Electrical Engineering - Complete Master Library

 

📘 Power Systems – 100 Very Tough MCQ (Page 17)

Continuation of advanced MCQ series (Q31–100).

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🔹 Questions (31–60)

31. In SMIB system, power angle curve is: A) Linear B) Sinusoidal C) Exponential D) Quadratic

32. If inertia constant increases, critical clearing time: A) Decreases B) Increases C) Constant D) Zero

33. In per-unit system, impedance transformation across transformer: A) Changes B) Remains same C) Doubles D) Halves

34. Most stable FACTS device: A) SVC B) STATCOM C) TCSC D) UPFC

35. Maximum economic loading occurs when: A) Costs equal B) Incremental costs equal C) Voltages equal D) Power equal

36. Distance relay underreach occurs due to: A) Infeed B) Outfeed C) High voltage D) Zero sequence

37. HVDC converter uses: A) IGBT B) Thyristor C) Diode D) MOSFET

38. Base current increases when: A) Base MVA increases B) Base voltage increases C) Frequency increases D) Reactance increases

39. Equal area criterion ensures: A) Voltage stability B) Rotor angle stability C) Frequency control D) Reactive control

40. Critical clearing angle depends on: A) Mechanical power B) Maximum power C) Both D) Neither

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🔹 Questions (61–100)

61. Corona increases with: A) Conductor diameter increase B) Voltage increase C) Spacing increase D) Frequency decrease

62. Economic dispatch with losses requires: A) Penalty factor B) Zero loss C) Equal power D) Same voltage

63. Swing equation is second order differential equation. (True/False)

64. If Z1 = Z2 = Z0, fault current highest for: A) SLG B) LL C) LLG D) LLL

65. Slack bus compensates: A) Load B) Voltage C) Losses D) Frequency

66. Fast decoupled method assumes: A) Voltage magnitude weakly coupled with P B) Voltage magnitude weakly coupled with Q C) Angle weakly coupled with Q D) No coupling

67. Stability improves when: A) X increases B) X decreases C) Voltage decreases D) Frequency decreases

68. HVDC eliminates reactive power flow. (True/False)

69. Inverse time relay operates faster for: A) Low fault current B) High fault current C) Normal load D) No current

70. Surge impedance =: A) √(R/L) B) √(L/C) C) √(C/L) D) L/C

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🔹 Answers

31. B 32. B 33. B 34. D 35. B 36. A 37. B 38. A 39. B 40. C 61. B 62. A 63. True 64. D 65. C 66. C 67. B 68. True 69. B 70. B

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Page 17 – Advanced MCQ Series Completed (Q31–100)