NABTEB Automobile Electrical Works study guide
NABTEB Automobile Electrical Works · Work through your exam, one topic at a time.
NABTEB Automobile Electrical Works is a Nigerian trade credential for people who service, diagnose and repair the electrical systems of cars, buses, trucks and light commercial vehicles. Candidates are typically apprentices in roadside or fleet workshops, technicians in company garages, or students in technical colleges and vocational centres who want a recognised qualification rather than only on-the-job experience. The NABTEB Automobile Electrical Works study guide has 10 sections and about 3,338 words.
01Electrical Principles and Circuit Fundamentals
This domain tests Ohm's law, power, series and parallel networks, Kirchhoff's laws, magnetism and basic circuit faults. Expect calculation questions and simple circuit reasoning rather than memorised definitions.
344 words, about 2 min02Batteries and Charging Systems
This domain covers lead-acid battery construction, ratings, state of charge, charging principles, alternator operation and charging-system faults. A 12 V lead-acid battery has six cells, each about 2.1 V at rest, giving about 12.6–12.8 V fully charged.
324 words, about 2 min03Starting Systems
This domain tests starter-motor construction, control circuits, cranking voltage drops, solenoid operation and no-crank diagnosis. A starter is usually a series-wound DC motor: high starting torque, heavy current, short duty.
324 words, about 2 min04Ignition Systems
This domain covers coil ignition, contact-breaker and electronic systems, dwell, timing, spark plugs and distributors, plus coil-on-plug and CDI arrangements. The ignition coil is a step-up transformer: primary winding, secondary winding, soft-iron core.
340 words, about 2 min05Lighting and Signalling Systems
This domain tests headlamp, side, indicator, hazard, brake, reverse, horn and interior lighting circuits, including relays, flashers and earth returns. Lamps are rated in watts at nominal voltage.
334 words, about 2 min06Wiring, Harnessing and Circuit Protection
This domain covers cable selection, voltage drop, fuses, fusible links, circuit breakers, relays, terminals, harness routing and connector protection. Cable must carry the load current with acceptable voltage drop, usually under about 0.5 V for a lighting or accessory circuit and less for sensors.
334 words, about 2 min07Accessories and Auxiliary Electrical Equipment
This domain covers wipers, washers, horns, windows, central locking, blowers, instruments, audio, auxiliary sockets and body-control functions. Most accessories are controlled by relays or a body control module (BCM), not directly by the switch.
328 words, about 2 min08Diagnosis, Testing and Fault Finding
This domain tests a logical diagnostic process, use of multimeters, test lamps, oscilloscopes and current clamps, voltage-drop testing and interpretation of readings. Follow a sequence: verify the complaint, gather information, visual inspection, check for DTCs, study the wiring diagram, test the circuit, confirm the repair.
331 words, about 2 min09Workshop Practice, Tools and Safety
This domain covers hand and special tools, torque, battery and high-voltage safety, PPE, fire precautions, lifting and housekeeping in an automotive electrical workshop. Use the right tool: insulated screwdrivers, crimping pliers, terminal picks, torque wrench, pullers, multimeter and insulation tester.
341 words, about 2 min10Automotive Electrical Drawing, Measurement and Trade Science
This domain tests wiring-diagram symbols, DIN terminal designations, units and prefixes, measurement accuracy and basic trade science. DIN terminal numbers: 30 permanent battery positive, 15 ignition-switched positive, 31 earth or negative, 50 starter control, 61 charging warning lamp, 85 and 86 relay coil, 87 relay load contact, 87a normally closed contact.
338 words, about 2 min