NABTEB Auto Mechanics 2023 Past Questions & Answers

8 questions from the 2023 NABTEB Auto Mechanics paper

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

1. 1.What is the function of the differential in the rear axle?

   • A.To change the direction of power from the propeller shaft to the wheels
   • B.To allow the rear wheels to rotate at different speeds during cornering
   • C.To lock the rear axle for all-wheel drive
   • D.Both A and B

2. 2.Why should engine oil and oil filter be changed at regular intervals?

   • A.To comply with manufacturer warranty requirements
   • B.Old oil becomes contaminated with particles and loses its protective properties
   • C.To improve engine performance
   • D.To reduce fuel consumption

3. 3.Why is a mixture of water and antifreeze used as coolant instead of pure water?

   • A.Pure water has lower boiling and freezing points
   • B.Antifreeze prevents corrosion, lowers freezing point, and raises boiling point
   • C.Water conducts heat poorly
   • D.Antifreeze is cheaper

4. 4.Why is a voltage regulator necessary in the charging system?

   • A.To prevent the alternator from overcharging the battery
   • B.To reduce engine noise
   • C.To increase fuel efficiency
   • D.To protect the starter motor

5. 5.The cylinder block houses all the pistons and is subject to extreme temperature changes. Why is the material choice critical?

   • A.To reduce engine weight
   • B.To provide strength, thermal stability, and resist warping
   • C.To improve fuel efficiency
   • D.To reduce manufacturing costs

6. 6.A diesel engine has a higher compression ratio than a petrol engine. Why is this difference necessary?

   • A.To allow self-ignition of diesel fuel without spark plugs
   • B.To increase engine power output
   • C.To reduce fuel consumption
   • D.To prevent knocking in diesel engines

7. 7.Why is brake fluid replaced periodically rather than just topped up when low?

   • A.It prevents color fading
   • B.Brake fluid absorbs moisture, which reduces boiling point and causes corrosion; old fluid must be flushed and replaced
   • C.It improves braking power
   • D.It prevents leaks

8. 8.A vehicle bounces excessively after hitting a bump. What is the likely cause?

   • A.Weak springs
   • B.Faulty shock absorbers that cannot dampen spring oscillations
   • C.Low tire pressure
   • D.Misaligned wheels

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