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22-Mec-B1 Advanced Machine Design: December 2019

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

  1. Question 1 Short-answer theory — green design, hollow shafts, principal stresses (10 marks)
  2. Question 2 Overhung diving board — impact loading, principal stress and safety factor (30 marks)
  3. Question 3 Single-surface disk clutch — uniform-wear design and transmitted power (20 marks)
  4. Question 4 Notched bar in axial fatigue — notch factor, stresses and infinite-life margin (20 marks)
  5. Question 5 Double short-shoe external drum brake — torque, actuating force and self-locking (20 marks)
  6. Question 6 Twin Acme power screws raising a sluice gate — torque, speed and power (20 marks)

Start with Question 1 →

Paper format. National Exams, December 2019 — 16-Mec-B1 Advanced Machine Design. Three hours, open book, 100 marks. Part I (Problems 1 and 2) is compulsory; the candidate answers three of the four Part II problems (Problems 3–6). Any non-communicating calculator is permitted, all assumptions must be stated, and every tabulated value or equation must be sourced. All six problems are worked here, so the set is complete as a study resource.

Reference texts. Budynas & Nisbett, Shigley's Mechanical Engineering Design, 11th ed. (fatigue and notch sensitivity §6, power screws §8-2, clutches and brakes §16); Norton, Machine Design: An Integrated Approach, 6th ed. (impact loading §3, stress transformation §4, brakes §16); Juvinall & Marshek, Fundamentals of Machine Component Design, 6th ed. (screws, clutches, brakes); Hibbeler, Mechanics of Materials, 10th ed. (beam bending, principal stresses, impact factors); CSA/ISO 14006 Eco-design management systems and ISO 14040 Life-cycle assessment for the green-design criteria.