NABTEB Auto Mechanics 2025 Past Questions & Answers

7 questions from the 2025 NABTEB Auto Mechanics paper

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

1. 1.In a normally aspirated engine, the intake valve typically opens before the piston reaches top dead center (TDC). This is called valve overlap. What is the primary advantage?

   • A.It increases fuel consumption
   • B.It allows the exhaust gas to push the fresh charge into the cylinder
   • C.It reduces engine compression
   • D.It prevents backfiring

2. 2.What does the ABS prevent during emergency braking on a slippery surface?

   • A.It prevents the vehicle from stopping too quickly
   • B.It prevents the wheels from locking up, maintaining steering control and reducing stopping distance
   • C.It reduces braking power
   • D.It prevents brake fade

3. 3.A mechanic suspects a blocked radiator. What observable symptoms would confirm this diagnosis?

   • A.Low coolant level and white smoke from the engine
   • B.Overheating at highway speeds, coolant level correct, but radiator fins are clogged with debris
   • C.Hard starting and rough idling
   • D.Loss of coolant without visible leaks

4. 4.A vehicle experiences fuel starvation at high engine speeds. Which fuel system component is least likely to be the cause?

   • A.A clogged fuel filter
   • B.A weak fuel pump
   • C.A cracked fuel hose
   • D.A faulty spark plug

5. 5.A vehicle exhibits intermittent electrical problems—sometimes lights dim, sometimes the horn fails. What is the most likely cause?

   • A.A faulty battery
   • B.Corroded or loose electrical connections
   • C.A failed alternator
   • D.A blown fuse

6. 6.The final drive in a rear-wheel-drive vehicle has a 3.73:1 ratio. What effect does this have compared to a 2.73:1 ratio?

   • A.The vehicle accelerates faster but has lower top speed
   • B.The vehicle has lower fuel economy
   • C.Both A and B are true
   • D.The vehicle has a higher top speed

7. 7.What does 'camber' refer to in wheel alignment?

   • A.The angle of the steering axis in the vertical plane
   • B.The forward or backward tilt of the wheel from vertical, viewed from the front
   • C.The angle between the two front wheels when straight
   • D.The height of the suspension above the ground

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