NABTEB Auto Mechanics 2022 Past Questions & Answers

8 questions from the 2022 NABTEB Auto Mechanics paper

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

1. 1.What advantage does an automatic transmission have over a manual transmission in city driving?

   • A.It is cheaper to manufacture
   • B.It provides higher fuel efficiency
   • C.It eliminates the need for the driver to manually shift gears, reducing fatigue
   • D.It prevents transmission overheating

2. 2.What is the function of suspension springs in a vehicle?

   • A.To store energy and absorb bumps from the road, providing a smooth ride
   • B.To increase traction on wet roads
   • C.To improve fuel economy
   • D.To prevent tire wear

3. 3.A manufacturer recommends an oil change every 10,000 km or 6 months, whichever comes first. Why is the time interval important in addition to distance?

   • A.Oil thickens over time
   • B.Oil oxidizes even when the engine is not running, and moisture accumulates; stale oil loses its protective properties
   • C.The oil filter wears out
   • D.The engine seals deteriorate with time

4. 4.In a 4-stroke petrol engine, what is the correct sequence of events during one complete cycle?

   • A.Intake, compression, power, exhaust
   • B.Compression, power, exhaust, intake
   • C.Power, exhaust, intake, compression
   • D.Exhaust, intake, compression, power

5. 5.A petrol engine misfires and lacks power. Spark plugs are fouled with black carbon deposits. What does this indicate?

   • A.The engine is burning too much oil
   • B.The air-fuel mixture is too rich (too much fuel)
   • C.The cooling system is overheating
   • D.The transmission fluid is contaminated

6. 6.A vehicle overheats frequently. The water pump is functioning normally, but the coolant level is correct. What is the most likely cause?

   • A.A faulty thermostat stuck in the closed position
   • B.A loose water pump belt
   • C.Insufficient coolant concentration
   • D.A damaged radiator hose

7. 7.If an engine oil pressure warning light comes on while driving, what should the driver do?

   • A.Continue driving; it is just a sensor malfunction
   • B.Stop immediately and check the oil level and pressure
   • C.Drive slowly to the nearest mechanic
   • D.Add more oil and continue driving

8. 8.Modern engines use fuel injection instead of carburetors. What is the main advantage of fuel injection?

   • A.It is cheaper to manufacture
   • B.It provides more precise fuel metering, better cold starting, and lower emissions
   • C.It requires less maintenance
   • D.It operates at lower fuel pressures

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