Paper format. National Examinations, May 2017 — 16-Mec-A4, Design and Manufacture of Machine Elements. Three hours, open book, any non-communicating calculator. Six questions in two parts: Part A (Q1–Q3) is manufacturing-process theory, Part B (Q4–Q6) is machine-element analysis. The rubric asks for two questions from Part A and two from Part B, all of equal value (25 % each). All six are solved here, because this set is a study resource rather than an examination script.
Reference texts.
- Kalpakjian, S. and Schmid, S. R., Manufacturing Engineering and Technology, 7th ed. — casting defects (Ch. 12), extrusion (Ch. 15), rolling (Ch. 13), thread manufacture (Ch. 23).
- Groover, M. P., Fundamentals of Modern Manufacturing, 6th ed. — sand casting, bulk deformation, thread rolling.
- Budynas, R. G. and Nisbett, J. K., Shigley's Mechanical Engineering Design, 10th ed. — welded joints (Ch. 9), brakes and clutches (Ch. 16).
- Juvinall, R. C. and Marshek, K. M., Fundamentals of Machine Component Design, 5th ed. — drivetrain free bodies and mounting reactions (Ch. 4–5).
- Hibbeler, R. C., Engineering Mechanics: Statics, 14th ed. — three-dimensional equilibrium, couples.
Check — two readings taken from the printed figures. (i) In the Q6 brake figure the 300 mm dimension line runs through the drum centre with an arrowhead on each rim, so it is a diameter: the drum radius is 150 mm. A radius reading of 300 mm is geometrically impossible here because the arms stand only 250 mm off the centreline. (ii) Q6 states only that “the coefficient of friction is specified”; the numeric value is not given, so μ = 0.30 is assumed (a normal value for a moulded lining on cast iron) and every result is also given in closed symbolic form so any other μ can be substituted directly.
