NABTEB Auto Mechanics 2024 Past Questions & Answers

8 questions from the 2024 NABTEB Auto Mechanics paper

Try them on paper first. The correct options and worked answers are in the app.

1. 1.A modern vehicle displays a 'check engine' light. Which diagnostic tool would a mechanic use to read the fault code?

   • A.A multimeter
   • B.An oscilloscope
   • C.An OBD-II scanner or diagnostic code reader
   • D.A pressure gauge

2. 2.A vehicle's first gear has a 3.5:1 ratio, meaning the engine turns 3.5 times for every wheel rotation. Why is first gear not used for highway driving?

   • A.It overheats the transmission
   • B.It provides excessive torque but very low wheel speed, resulting in high engine RPM and fuel waste at highway speeds
   • C.It damages the engine
   • D.It prevents reaching maximum speed

3. 3.Why is the firing order important in a multi-cylinder engine?

   • A.It determines the cylinder arrangement
   • B.It ensures even torque delivery and smooth engine operation
   • C.It controls the speed of the engine
   • D.It regulates fuel consumption

4. 4.What is the main advantage of an air-cooled engine compared to a water-cooled engine?

   • A.It is more efficient at heat removal
   • B.It is simpler, has fewer components, and is lighter in weight
   • C.It maintains more consistent temperature
   • D.It provides better power output

5. 5.What is the purpose of the fuel filter in the fuel system?

   • A.To increase fuel pressure
   • B.To remove dust, water, and other contaminants from the fuel
   • C.To regulate fuel flow rate
   • D.To prevent fuel evaporation

6. 6.What is the advantage of rack-and-pinion steering over recirculating-ball steering in modern cars?

   • A.It is stronger for heavy-duty vehicles
   • B.It provides more direct steering feel and requires less effort
   • C.It is simpler to repair
   • D.It costs less to manufacture

7. 7.In splash lubrication, how is oil distributed to engine components?

   • A.A pump forces oil through drilled passages to each component
   • B.The rotation of the crankshaft splashes oil onto bearing surfaces and cylinder walls
   • C.Oil droplets are suspended in the air and coat all surfaces
   • D.A wick absorbs oil and distributes it evenly

8. 8.Modern vehicles use electronic ignition systems instead of mechanical contact breaker systems. What is a key advantage?

   • A.Electronic systems are cheaper
   • B.They provide more consistent spark timing and eliminate points maintenance
   • C.They reduce engine noise
   • D.They increase fuel consumption

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