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22-Elec-A6 Power Systems and Machines: Undated paper

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

  1. Question 1 Magnetic Circuit of a Toroid
  2. Question 2 Transformer Short-Circuit Test and Efficiency
  3. Question 3 Transformer Equivalent Circuit from OC and SC Tests
  4. Question 4 Combined Load with a Synchronous Motor — Power Factor
  5. Question 5 Short-Answer Concepts in Power Systems and Machines

Start with Question 1 →

Paper format: Closed-book, 3 hours. Five questions constitute a complete paper and all are of equal value (20 marks each); answer all five. All AC voltages and currents are rms, three-phase voltages are line-to-line, and power is total real power unless noted otherwise.

Reference texts (22-Elec-A6 Power Systems and Machines): S. J. Chapman, Electric Machinery Fundamentals, 5th ed. (McGraw-Hill); B. S. Guru & H. R. Hiziroglu, Electric Machinery and Transformers, 3rd ed. (Oxford); P. C. Sen, Principles of Electric Machines and Power Electronics, 2nd ed. (Wiley).

Note — paper identity. This paper’s own running header reads 16-Elec-A6/May 2019, so it is the May 2019 sitting. Question 2’s closing assumption is printed as "losses are too small to account for"; the reading adopted below is that the core losses are too small to account for (see the note under Question 2).