EMM 107: Engineering Materials Past Examination Papers

picture_as_pdf EMM 100: Engineering Drawing and Design I Examination First-year drawing paper on first-angle orthographic projection of a bracket, section elevations, dimensioning and title blocks. PDF KES 40.00 picture_as_pdf EMM 217: Principles of Engineering Design First Semester Examination Design paper that starts from why materials knowledge matters to a design engineer and sizes the support posts of a tensile-testing apparatus from yield strength and a chosen factor of safety. Works the design process end to end on a product of the candidate's own: the questions that define the problem, the levels of analysis applied to candidate solutions, designing for safety, the questions that make up a testing protocol, and the options when a prototype fails that protocol. Distinguishes standards from codes and developmental, adaptive and new design, applies ergonomic principles to a hospital bed, and estimates the factor of safety under the maximum shear stress, distortion energy and maximum normal stress theories. Selects a hull material against stated strength, hardness and cost limits, then treats product liability, design constraints, manufacturability, noise, machine elements, bearing selection, and the difference between a model and a prototype. PDF KES 40.00 picture_as_pdf EMM 301: Mechanics of Machines I Third Trimester Examination Mechanisms paper that opens on the Aronhold Kennedy theorem and the instantaneous centre of rotation, then locates the instantaneous centres of a pin-jointed four bar mechanism and finds the angular velocity of a link. Determines the ratio of cutting to return time of a crank and slotted lever shaper from the centre distance and crank radius, and works a toggle mechanism for the velocity of the slider, the angular velocities of three links, the rubbing velocities at two pins, the crank torque for a given force and the angular acceleration of a link. Continues with the torque transmitted by a cone clutch under uniform pressure and uniform wear, the mean radius and face width of a single dry plate clutch, the named parts of a spur gear, the derivation of the length of the path of contact and the contact ratio of a pinion and wheel. Closes on chain drives against belt drives and the torque, power, friction loss and efficiency of an open belt drive. PDF KES 40.00 picture_as_pdf EMM 314: Manufacturing Work Study Revision Questions with Worked Solutions Question sets for the unit with the calculations worked through. The questions cover why a job is chosen for methods study, the areas to focus on when improving work methods, the reasons for excess work content arising from defects in design or specification, what work measurement achieves, the advantages of work sampling over time study, the predetermined time study approach, and the principles of motion economy as they apply to the human arms and body. The solutions take a work sampling study over five days at eight hours a day with ten operators, fifteen per cent allowances and six thousand components produced, and carry it through observed time to effective time, normal time at a performance rating of one hundred and twenty per cent and the standard time, alongside a stop-watch study of five elements rated at eighty to one hundred and ten per cent. PDF KES 40.00 picture_as_pdf EMM 312: Fluid Mechanics III First Semester Examination Open channel and compressible flow paper. Defines critical depth and derives it for a rectangular channel, shows the Froude number equals one at critical conditions, and works specific energy, critical depth and maximum discharge for a channel of given width, velocity and depth. Explains shock waves and separates normal from oblique, derives the maximum flow over a broad crested weir, and establishes when a hydraulic jump forms and the depth after it with the loss of specific energy. Continues with the pressure rise when a valve closes on a liquid in a thin walled pipe, treated for a rigid pipe and for an elastic one that stretches, and derives Bernoulli's equation for a compressible fluid under steady adiabatic conditions, applied to the maximum continuous discharge of air from a small orifice in the side of a large vessel. PDF KES 40.00