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16-Mechatronics-B10: December 2019

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Reluctance, MMF and Flux Density of a Wound Toroid
  2. Question 2 Short-Circuit Test — Equivalent Reactance and Efficiency of a Single-Phase Transformer
  3. Question 3 Approximate Equivalent Circuit From Open- and Short-Circuit Tests
  4. Question 4 Combining a Lagging Load With a Leading Synchronous Motor, and the Effect of Frequency on Power Angle
  5. Question 5 Short-Answer Machines and Power-Systems Theory

Start with Question 1 →

Paper format. 16-Mex-B10, Power Systems and Machine Drives, National Examinations December 2019 — a three-hour closed-book examination with one double-sided 8½″×11″ aid sheet permitted (no worked solutions or diagrams on it) and an approved Casio or Sharp calculator. The cover page states that FIVE (5) questions constitute a complete exam paper, all of equal value; all five printed questions are worked here. Unless stated otherwise, AC voltages/currents are rms and three-phase quantities are line-to-line voltages with total real power.

Reference texts. S.J. Chapman, Electric Machinery Fundamentals, 5th ed. (Ch. 1 magnetic circuits and reluctance; Ch. 2 transformer equivalent circuits and open/short-circuit testing; Ch. 4 induction motors and power-factor correction; Ch. 6 synchronous-motor power-angle characteristics).