Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Paper format. National Exams, December 2016 — 07-Elec-B8 Power Electronics and Drives. Open-book, 3 hours, six problems (PROBLEM 1–6) of equal value; the rubric marks only the first five answered. Every problem is solved here, because the set is intended as a study resource.
Reference texts. M. H. Rashid, Power Electronics: Circuits, Devices and Applications, 4th ed. (the EGBC-recommended primary reference for this code); N. Mohan, T. Undeland and W. Robbins, Power Electronics: Converters, Applications and Design, 3rd ed.; B. K. Bose, Modern Power Electronics and AC Drives; R. Krishnan, Electric Motor Drives: Modeling, Analysis and Control.
Conventions used throughout. Angles are electrical degrees measured from the positive-going zero crossing of the supply. For a phase-controlled converter feeding an R–L load the load angle is $\varphi=\tan^{-1}(X/R)=\cos^{-1}(\mathrm{pf})$, the delay angle is $\alpha$, the extinction angle is $\beta$ and the conduction angle is $\gamma=\beta-\alpha$.
