Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)
Paper format. National Exams, May 2017 — 16-Mec-B11 Acoustics and Noise Control; 3 hours; CLOSED BOOK (one approved Casio or Sharp calculator). Seven questions of equal value (20 marks each); FIVE questions constitute a complete paper. All seven are solved here so the set works as a study resource.
Reference texts. D. A. Bies, C. H. Hansen and C. Q. Howard, Engineering Noise Control, 5th ed. (CRC Press) — the standard reference for this exam code; L. L. Beranek and I. L. Vér, Noise and Vibration Control Engineering, 2nd ed. (Wiley); L. E. Kinsler, A. R. Frey, A. B. Coppens and J. V. Sanders, Fundamentals of Acoustics, 4th ed. (Wiley); CSA Z107 series and the provincial OH&S noise regulations for the Canadian occupational-exposure context.
Units and constants used throughout. Reference pressure $p_{\text{ref}}=20\ \mu\text{Pa}$; reference power $W_{\text{ref}}=10^{-12}\ \text{W}$; reference intensity $I_{\text{ref}}=10^{-12}\ \text{W/m}^2$. Where a question does not state the air temperature, air at $20\ {}^\circ\text{C}$ is assumed: $c=343\ \text{m/s}$, $\rho_0 c = 413\ \text{rayl}$. Question 3 states its own values and they are used there.
