Monday, 23 February 2026

📘 Power Systems – 500 Most Expected Questions (Page 24)

High Probability Questions for GATE + PSU + Interviews. Organized Topic-Wise.

🔹 Section 1 – Per Unit System (1–50)

1. Define per unit system. 2. Derive base impedance formula. 3. Why transformer impedance same in pu? 4. Convert 0.15 pu to actual ohms. 5. Effect of base change on current. ... 50. Advantages of per unit method.

🔹 Section 2 – Fault Analysis (51–120)

51. Derive 3-phase fault current. 52. Derive SLG fault formula. 53. Why 3-phase fault highest? 54. Difference between LL and LLG fault. ... 120. Compare fault level at different buses.

🔹 Section 3 – Transmission Lines (121–180)

121. Derive short line model. 122. Explain Ferranti effect. 123. Surge impedance derivation. ... 180. Effect of series compensation.

🔹 Section 4 – Stability (181–230)

181. Derive swing equation. 182. Equal area criterion explanation. ... 230. Critical clearing angle numerical.

🔹 Section 5 – Economic Dispatch (231–270)

231. Derive economic dispatch equation. 232. Explain penalty factor. ... 270. Dispatch with limits problem.

🔹 Section 6 – Load Flow (271–320)

271. Types of buses. 272. NR derivation. ... 320. Convergence comparison.

🔹 Section 7 – Protection (321–380)

321. Distance relay working. 322. Zone settings. ... 380. Breaker rating calculation.

🔹 Section 8 – HVDC & FACTS (381–430)

381. Advantages of HVDC. 382. Power control in HVDC. ... 430. STATCOM vs SVC.

🔹 Section 9 – Power Quality & Misc (431–500)

431. Corona theory. 432. Load factor derivation. ... 500. Most expected numerical (integrated).

Page 24 – 500 Most Expected Questions Compilation Completed

🔥 Power Systems Complete Master Course (24 Pages) Achieved 🔥

Shaktimatha 369 Technologies

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