Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
National Exams, 04-BS-4 Electric Circuits and Power — May 2016. Closed book; one double-sided aid sheet permitted; any five of the seven questions constitute a complete paper (all seven are answered here as a complete study resource).
Reference texts: Sadiku & Alexander, Fundamentals of Electric Circuits, 6th ed. (circuit analysis, transients, AC steady state, magnetic circuits); Boylestad & Nashelsky, Electronic Devices and Circuit Theory (rectifiers); Mano, Digital Design (combinational logic).