Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Paper format. National Exams, May 2019 — 16-Elec-A3 Signals and Communications. Three hours, closed book, one approved Casio or Sharp calculator. Five questions, all of equal value; the rubric instructs candidates to answer all 5 questions, so all five are worked in full below.
Reference texts. B. P. Lathi and Z. Ding, Modern Digital and Analog Communication Systems, 4th ed. — the primary EGBC reference for this exam code; B. P. Lathi, Linear Systems and Signals, 2nd ed.; A. V. Oppenheim and A. S. Willsky, Signals and Systems, 2nd ed.; J. G. Proakis and D. G. Manolakis, Digital Signal Processing, 4th ed.; S. Haykin, Communication Systems, 5th ed.
The printed paper fixes two readings: Question 1 specifies the ideal low-pass bandwidth as B = 25 kHz, and Question 2 states that the signal bandwidth is 10 kHz. The paper’s own running header reads “16-Elec-A3/May 2019”, so it is the May 2019 sitting.
