25-Nav-B6 Ocean Engineering and Offshore Structures, May 2013: worked solutions

Paper format. PEO National Examinations, May 2013 — 98-Mar-B6, printed for Electrical & Electronics Engineering / Mechanical Engineering candidates. Three hours, closed book, two approved calculators (Casio or Sharp). Eight questions of equal value; any five constitute a complete paper, and only the first five appearing in the answer book are marked. Constants supplied on the front page: $\pi = 3.14159$, $1\ \text{hp} = 746\ \text{W}$, $\mu_0 = 4\pi\times10^{-7}\ \text{H}\,\text{m}^{-1}$. All eight questions are solved here so the solutions cover whichever five a candidate chooses.

Subject note

This paper, although listed under “Ocean Engineering and Offshore Structures”, is headed 98-Mar-B6 and every question is Electrical & Electronics Engineering content (BJT current mirror, combinational logic, dc machine design, ac power/power-factor correction, op-amp transfer functions, induction-motor dc test and speed-torque, RC-circuit transients, magnetic-circuit impedance) — zero naval-architecture or ocean-engineering content. Solved as the exam actually printed.

Reference texts

Sedra & Smith, Microelectronic Circuits, 8th ed. — BJT current mirrors (Ch. 8), op-amp circuits (Ch. 2).
Mano & Ciletti, Digital Design, 6th ed. — Boolean algebra and DeMorgan’s theorems (Ch. 2), NAND/NOR universal gates (Ch. 3).
Chapman, Electric Machinery Fundamentals, 5th ed. — dc machine emf and torque (Ch. 7–8), induction motors and the dc test (Ch. 6), transformers (Ch. 2).
Sadiku & Alexander, Fundamentals of Electric Circuits, 7th ed. — ac power and power-factor correction (Ch. 11), first-order transients (Ch. 7), frequency response (Ch. 14).
Hayt, Kemmerly & Durbin, Engineering Circuit Analysis, 9th ed. — phasor methods and transfer functions.

25-Nav-B6 Ocean Engineering and Offshore Structures: May 2013