GATE Electrical Engineering - Complete Master Library

 

📘 Power Systems – 100 Very Tough MCQ (Page 16)

Advanced GATE/PSU level MCQs covering all chapters. Answers provided at bottom for self-evaluation.

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🔹 Questions (1–25)

1. If X1 = X2 ≠ X0, highest fault current occurs in:
A) SLG B) LL C) LLG D) LLL

2. In per-unit system, transformer impedance remains unchanged when base voltage is changed proportionally. (True/False)

3. Surge impedance loading depends on:
A) Line length B) Surge impedance C) Frequency D) Load

4. Equal area criterion applies to:
A) Multi-machine system directly B) Single machine infinite bus C) Load flow D) Economic dispatch

5. If system reactance reduces by 50%, fault current:
A) Doubles B) Halves C) Remains same D) Increases 25%

6. For economic dispatch with losses, coordination equation becomes:
A) dCi/dPi = λ
B) dCi/dPi × Penalty = λ
C) Pi equal
D) Voltage equal

7. Fast decoupled load flow assumes:
A) R >> X B) X >> R C) R = X D) G large

8. HVDC eliminates:
A) Skin effect B) Corona C) Resistance D) Voltage drop

9. Maximum steady state power occurs at δ = ?

10. If mechanical power > electrical power, rotor:
A) Slows B) Accelerates C) Stops D) Oscillates

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🔹 Questions (26–50)

26. Zero sequence current flows only if:
A) Neutral grounded B) Delta connected C) Isolated system D) HVDC

27. Penalty factor increases when transmission losses:
A) Increase B) Decrease C) Zero D) Constant

28. In LFC, droop characteristic ensures:
A) Equal voltage B) Load sharing C) No losses D) Stability only

29. NR method convergence is:
A) Linear B) Quadratic C) Cubic D) Exponential

30. Short transmission line ignores:
A) R B) L C) C D) G

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🔹 Answers (1–30)

1. D
2. True
3. B
4. B
5. A
6. B
7. B
8. A
9. 90°
10. B
26. A
27. A
28. B
29. B
30. C

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Page 16 – Very Tough MCQ Round Started

(Continue to next page for MCQ 31–100)