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22-Elec-B8 Power Electronics and Drives: December 2015

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

  1. Question 1 SCR Static Characteristic and A.C. Voltage Controller Delay Angles
  2. Question 2 Harmonic Sources and a Full-Wave Controlled Rectifier Feeding a Back E.M.F.
  3. Question 3 Smoothing Reactors and a Basic Step-Down Chopper
  4. Question 4 Single-Pulse-Modulated Inverter Feeding a Motor with Power-Factor Correction
  5. Question 5 High-Frequency PWM Drawbacks and a Current-Source-Inverter-Fed Induction Motor
  6. Question 6 Three-Phase Bridge Converter Driving a Separately Excited D.C. Motor

Start with Question 1 →

Paper format. National Exams, December 2015 — 07-Elec-B8 Power Electronics and Drives. Open Book, 3 hours. Six problems, all of equal value (20 marks each); the rubric states that any five constitute a complete paper and only the first five presented in the answer book are marked. All six are solved below, in full and including every sub-part, because this set is a study resource rather than an examination script.

Reference texts. M. H. Rashid, Power Electronics: Circuits, Devices and Applications, 4th ed. (primary EGBC reference for this code); N. Mohan, T. M. Undeland and W. P. Robbins, Power Electronics: Converters, Applications and Design, 3rd ed.; C. W. Lander, Power Electronics, 3rd ed.; B. K. Bose, Modern Power Electronics and AC Drives; R. Krishnan, Electric Motor Drives: Modeling, Analysis and Control. Angles are quoted in degrees but every integral is evaluated with the angle in radians, and each conduction integral is taken over the real conduction window rather than over an assumed half cycle.