NSSCO Motor Mechanics 6189 study guide
NSSCO Motor Mechanics 6189 · Work through your exam, one topic at a time.
The NSSCO Motor Mechanics syllabus (6189) is the Namibia Senior Secondary Certificate Ordinary Level subject in motor vehicle technology, delivered through the national curriculum framework and assessed with both a written theory paper and practical work. It suits learners who want a recognised school-leaving qualification with a strong technical base, and it also serves as a stepping stone towards vocational training, apprenticeships or employment in workshops, dealerships and fleet operations. The NSSCO Motor Mechanics 6189 study guide has 11 sections and about 3,162 words.
01Workshop safety, health and environmental practice
Workshop safety, health and environmental practice is examined through hazard recognition, correct selection of protective and fire equipment, safe lifting, and legal disposal of workshop waste. Questions usually describe a situation and ask for the next safe action.
336 words, about 2 min02Hand tools, measuring instruments and workshop equipment
Hand tools, measuring instruments and workshop equipment tests tool identification, correct use, care and the interpretation of readings. Expect questions on micrometers, vernier calipers, dial test indicators, feeler gauges, torque wrenches, plastigauge and bore gauges, plus the safe use of bench grinders, presses and lifting gear.
284 words, about 1 min03Engine principles and four-stroke / two-stroke operation
Engine principles and four-stroke / two-stroke operation covers the events that convert fuel energy into crankshaft rotation, plus the arithmetic of capacity, compression ratio and firing order. Induction draws air–fuel mixture (petrol) or air (diesel); compression raises pressure and temperature; power follows ignition or injection; exhaust expels gases.
276 words, about 1 min04Engine construction, components and overhaul procedures
Engine construction, components and overhaul procedures covers the block, head, reciprocating assembly, valve train and the measurement discipline that decides whether parts are reused, reconditioned or replaced. Clean and visually inspect for cracks, scoring and thread damage before measuring.
307 words, about 2 min05Lubrication, cooling and fuel systems
Lubrication, cooling and fuel systems covers how an engine is lubricated, held at working temperature and supplied with a combustible mixture, and how faults in each system show up. A gear or rotor pump draws oil from the sump through a strainer, pushes it through the filter and galleries, and a relief valve limits pressure.
306 words, about 2 min06Electrical systems, battery, charging and starting
Electrical systems, battery, charging and starting tests circuit theory, battery construction and testing, alternator operation and starter diagnosis. A 12 V lead–acid battery has six cells of about 2.1 V.
279 words, about 1 min07Transmission, clutch, gearbox, final drive and differential
Transmission, clutch, gearbox, final drive and differential covers how engine torque is matched to road speed and how drive is engaged, interrupted and distributed to the wheels. A single-plate clutch uses a diaphragm spring to clamp the friction disc between flywheel and pressure plate.
300 words, about 2 min08Steering, suspension, wheels and tyres
Steering, suspension, wheels and tyres covers geometry, linkage and springing, plus the marking and inspection of tyres. Camber is the inward or outward tilt of the wheel viewed from the front.
284 words, about 1 min09Braking systems
Braking systems covers hydraulic principles, component function, bleeding and fault diagnosis, including ABS awareness. Pascal's law states that pressure applied to a confined fluid is transmitted equally in all directions.
272 words, about 1 min10Vehicle bodywork, chassis and maintenance/ servicing
Vehicle bodywork, chassis and maintenance/servicing covers construction, corrosion control, refinishing and the scheduled checks that keep a vehicle roadworthy. Body-on-frame vehicles use a separate chassis; monocoques use stressed body panels.
253 words, about 1 min11Basic workshop calculations and technical drawing
Basic workshop calculations and technical drawing tests unit conversion, area and volume, ratios, percentages, tolerances and the reading of engineering drawings. Work in consistent units: convert mm to m by dividing by 1,000.
265 words, about 1 min