📘 Power Systems – Rapid Fire 50 MCQ (Page 15)
Quick revision round covering per-unit, transmission lines, faults, stability, economic dispatch, LFC, HVDC and protection.
🔹 MCQ Section
1. Per unit value = Actual / Base ✔2. Ferranti effect occurs in long lines ✔
3. SIL depends on surge impedance ✔
4. Most severe fault = 3-phase fault ✔
5. Most common fault = SLG ✔
6. For SLG fault → Z1 + Z2 + Z0 ✔
7. Fault MVA = √3VI ✔
8. NR method has quadratic convergence ✔
9. Slack bus has fixed V and angle ✔
10. PV bus specifies P and V ✔
11. Economic dispatch condition → equal incremental cost ✔
12. Lambda represents incremental cost ✔
13. HVDC preferred for long distance ✔
14. STATCOM controls reactive power ✔
15. UPFC controls both real and reactive power ✔
16. Maximum power at δ = 90° ✔
17. Swing equation relates rotor angle ✔
18. Equal area criterion → transient stability ✔
19. Higher inertia improves stability ✔
20. Frequency drops when load increases ✔
21. Governor controls frequency ✔
22. AVR controls voltage ✔
23. Distance relay measures impedance ✔
24. Mho relay is directional ✔
25. Differential relay based on KCL ✔
26. CT saturation affects protection ✔
27. Fault current increases when impedance decreases ✔
28. Surge impedance = √(L/C) ✔
29. Base impedance = V²/S ✔
30. Base current = S/(√3V) ✔
31. Zero sequence current flows in SLG ✔
32. LL fault uses Z1 and Z2 ✔
33. Losses increase total generation ✔
34. Penalty factor used when losses included ✔
35. HVDC has no reactive power flow ✔
36. Corona increases with voltage ✔
37. Transmission at high voltage reduces losses ✔
38. Diversity factor > 1 ✔
39. Load factor < 1 ✔
40. Short line model ignores capacitance ✔
41. Fast decoupled load flow reduces computation ✔
42. Generator reverse power relay protects turbine ✔
43. Busbar differential is very fast ✔
44. Zone 1 distance relay covers 80% ✔
45. Fault level increases when network strengthened ✔
46. HVDC converters use thyristors ✔
47. TCSC is series FACTS device ✔
48. STATCOM faster than SVC ✔
49. Incremental cost curve usually quadratic ✔
50. Stable system returns to equilibrium after disturbance ✔
Page 15 Completed – Rapid 50 MCQ Revision
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