Industrial Visit Report: Makerspace, University of Nairobi

picture_as_pdf EBM 510: Electric Motor Drive Systems Second Semester Examination Second semester paper for the biomedical engineering degree, sat on Friday the twenty-ninth of January 2021 from eleven to one, question one compulsory at thirty marks and any two others at twenty. Question one defines drive and electric drive, sketches the torque and power limitations in combined armature voltage and field control, works an eight-pole three-phase induction motor on a sixty-hertz supply through synchronous speed in revolutions per second and per minute, the rotor speed at four per cent slip and the rotor frequency at three hundred revolutions per minute, determines the chopper frequency of a series motor on a two hundred and twenty volt supply from a pulse width of two point three eight six milliseconds, a twenty-five ampere current, a hundred volts of back e.m.f. and two tenths of an ohm of combined armature and field resistance, and then draws the block diagram of a separately excited speed control system with tachometer, amplifier gain, moment of inertia and viscous friction and takes its transfer function. The optional questions give two advantages of chopper-based direct current drives over rectifier-controlled devices and find the starting torque of a delta-connected four hundred volt, thirty-six point seven seven five kilowatt, seven hundred and fifty revolution per minute squirrel cage motor direct on line, with a star-delta starter and with a seventy per cent tapping auto-transformer, then work a rectifier-fed separately excited motor on a three-phase full controlled bridge at a forty-five degree delay angle to developed torque, speed, and the delay angle required when the field polarity is reversed. Others list three advantages of induction motors, separate passive from active loads with an example of each, derive the expression relating torque and speed of a cylindrical rotor synchronous motor, and size a single-phase full bridge feeding a one hundred and twenty-five horsepower motor for no-load speed and for rated speed at rated current. The last discusses four-quadrant operation of a direct current motor with a circuit for each quadrant, describes the effect of different rotor resistances on the torque-speed characteristic of an induction motor, and compares controlling an elevator load of two hundred newton metres by varying the supply of a four hundred volt series motor against inserting external armature resistance, with the efficiency of each. PDF KES 40.00 picture_as_pdf EBM 409: Concept Note for the Design of a UV Sterilization Lamp Concept note for a ultraviolet sterilization lamp: the need for surface and air disinfection in clinical spaces, the germicidal principle, the objectives, resources, and the design approach set for the assignment. Continuous assessment concept note for EBM 409 Machine Design, written on the department's cover with the background, problem, objectives, resources, expected outcome and the design approach. PDF KES 40.00 picture_as_pdf EBM 502: Artificial Intelligence, Group Presentation Group presentation on artificial intelligence for the unit: the definitions and history, the branches of the field, the reasoning and learning methods used by intelligent systems, and the applications of artificial intelligence in medicine and healthcare. PDF KES 40.00 picture_as_pdf ECU 400: Research Methodology Take-away CAT Take-away continuous assessment for the unit, set by the Electrical and Electronics Engineering Department of the School of Engineering and Technology, with the questions on knowledge management, the research problem and the proposal elements a student is expected to answer. PDF KES 40.00 picture_as_pdf Suitability of Geotechnical Landfill for Municipal Solid Waste Management in Nairobi City Literature review chapter of an engineering research proposal on geotechnical landfill for municipal solid waste management in Nairobi City: the volumes and composition of the city's waste, the siting and liner requirements of a landfill, the studies on leachate and groundwater risk, the alternatives reviewed, and the gap the proposed study addresses. PDF KES 40.00