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22-Mec-A5 Electrical and Electronics Engineering: December 2014

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

  1. Question 1 Current Transfer Ratio of a Three-Transistor Mirror
  2. Question 2 Exclusive-OR Synthesis and Analysis of a Gated Logic Array
  3. Question 3 Homopolar Disc Machine — emf, Torque and Output Power
  4. Question 4 Transformer Magnetic Circuit and Maximum Power Transfer
  5. Question 5 Op-Amp Frequency Response — Bode Sketch and Regional Behaviour
  6. Question 6 Induction Motor — DC Test, Slip, and Graphical Operating Point
  7. Question 7 First-Order RC Transient — Capacitor Voltage and Current
  8. Question 8 Parallel AC Network — Branch Currents, Power and Power-Factor Correction

Start with Question 1 →

Paper format. PEO / Engineers Canada National Examinations, December 2014 — 07-Mec-A5, Electrical & Electronics Engineering (Mechanical Engineering discipline). Three hours, closed book, one approved Casio or Sharp calculator. Eight questions; any five constitute a complete paper and each question is of equal value, so each counted question carries 20 marks. All eight questions are solved below, because this set is a study resource rather than an exam script.

Reference texts. A. S. Sedra and K. C. Smith, Microelectronic Circuits, 8th ed. (BJT current mirrors, op-amp frequency response); M. M. Mano and M. D. Ciletti, Digital Design, 6th ed. (universal-gate synthesis, DeMorgan reduction); S. J. Chapman, Electric Machinery Fundamentals, 5th ed. (dc machines, transformer magnetic circuits, induction-motor testing and slip); C. K. Alexander and M. N. O. Sadiku, Fundamentals of Electric Circuits, 7th ed. (phasor analysis, power factor, first-order transients); W. H. Hayt and J. A. Buck, Engineering Electromagnetics, 9th ed. (magnetic circuits and induced emf).

Front-page constants. Note [8] of the examination paper supplies μ0 = 4π × 10−7 H·m−1, π = 3.14159 and 1 hp = 746 W. All three are used exactly as printed; μ0 enters in Question 4 and the horsepower conversion in Question 3.

Check: data-table exponent. The Question 4 specification table reads 3.77 × 10−2 m and 7.54 × 10−2 m, and only those values give a physically sensible core (a few centimetres of flux path rather than several hundred metres) and reluctances that land on the round figures 1.5 × 106 and 3.0 × 106 A/Wb. The negative exponents are used throughout.