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NABTEB Motor Vehicle Mechanics Practice Questions - NABTEB Motor Vehicle Mechanics Work (NTC), Nigeria Exam
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Question
1
of 25
QUESTION 1 / 25
Which drivetrain layout requires a propeller shaft to transfer power from a front-mounted engine to the rear axle?
Choose one answer below.
A
Front-Engine, Front-Wheel Drive (FF)
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B
Front-Engine, Rear-Wheel Drive (FR)
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C
Rear-Engine, Rear-Wheel Drive (RR)
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D
Mid-Engine, Front-Wheel Drive (MF)
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QUESTION 2 / 25
What is the primary benefit of mounting an engine transversely in a front-wheel-drive (FF) passenger car?
Choose one answer below.
A
It permits a longer propeller shaft to be installed.
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B
It maximizes cabin passenger space and reduces engine bay length.
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C
It improves high-speed rear wheel traction.
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D
It allows for larger-capacity heavy-duty inline-8 engines.
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QUESTION 3 / 25
How does a full-time four-wheel-drive (4WD) system differ from a part-time 4WD system when driving on dry asphalt?
Choose one answer below.
A
Full-time 4WD uses a center differential to prevent driveline binding during cornering.
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B
Full-time 4WD locks the front and rear axles together permanently.
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C
Full-time 4WD must be manually disengaged above 50 km/h to prevent transfer case explosion.
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D
Full-time 4WD sends 100% of the engine torque to the front axle only.
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QUESTION 4 / 25
On a conventional body-on-frame vehicle, which component serves as the structural foundation supporting the engine, body, suspension, and steering systems?
Choose one answer below.
A
The firewall
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B
The chassis frame
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C
The bumper bar
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D
The floor pan
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QUESTION 5 / 25
What is the primary function of crumple zones designed into a modern monocoque (unibody) vehicle body structure?
Choose one answer below.
A
To make the vehicle lighter for improved fuel economy.
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B
To absorb and dissipate crash impact energy by deforming progressively.
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C
To prevent any damage to the engine block during a low-speed fender-bender.
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D
To provide rigid mounting points for heavy leaf-spring suspension systems.
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QUESTION 6 / 25
Which of the following is a key advantage of a front-engine, front-wheel-drive (FF) layout over a front-engine, rear-wheel-drive (FR) layout?
Choose one answer below.
A
Improved weight distribution for high-speed drag racing.
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B
Elimination of the drive shaft hump, resulting in a flat rear passenger floor.
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C
Simpler suspension design at the front steer steering axle.
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D
Reduced front tire wear due to shared steering and driving forces.
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QUESTION 7 / 25
Why is a mid-engine, rear-wheel-drive (MR) layout highly favored in high-performance sports cars?
Choose one answer below.
A
It maximizes rear luggage cargo space.
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B
It provides a low polar moment of inertia for superior cornering agility and balanced weight distribution.
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C
It makes engine maintenance and belt replacement much easier.
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D
It allows the engine to be cooled solely by ambient air flowing under the floor.
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QUESTION 8 / 25
What are the three primary functions of a motor vehicle's suspension system?
Choose one answer below.
A
To support vehicle weight, cushion road shocks, and maintain wheel contact with the road.
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B
To regulate engine speed, lubricate wheel bearings, and cool the brake rotors.
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C
To lock the differential, steer the front wheels, and charge the battery.
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D
To store exhaust gases, balance the driveshaft, and align the transmission gears.
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QUESTION 9 / 25
What is a major handling characteristic associated with rear-engine, rear-wheel-drive (RR) vehicles during high-speed cornering?
Choose one answer below.
A
Severe understeer due to a light rear end.
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B
A tendency to oversteer (tail-sliding) due to the heavy rear weight bias.
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C
Complete loss of front braking ability.
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D
Driveline bind when turning at low speeds.
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QUESTION 10 / 25
What is the purpose of universal joints (U-joints) in a front-engine, rear-wheel-drive (FR) propeller shaft assembly?
Choose one answer below.
A
To adjust the length of the driveshaft dynamically.
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B
To allow power transmission through changing drive angles as the rear axle moves up and down.
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C
To prevent the propeller shaft from rotating too fast.
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D
To isolate the transmission from engine vibrations.
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QUESTION 11 / 25
What is the primary function of the low-range gear set in a four-wheel-drive (4WD) transfer case?
Choose one answer below.
A
To increase vehicle top speed on highways.
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B
To multiply engine torque and reduce vehicle speed for heavy off-road traction.
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C
To disconnect the front axle to save fuel.
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D
To lock the steering knuckles for straight-line travel.
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QUESTION 12 / 25
Which component of the steering system directly connects the steering gearbox or rack-and-pinion to the front steering knuckles?
Choose one answer below.
A
The steering column
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B
The tie-rod assembly
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C
The pitman arm
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D
The sway bar link
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QUESTION 13 / 25
What is the primary purpose of the differential assembly in a drive axle?
Choose one answer below.
A
To change the direction of engine rotation by 180 degrees.
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B
To allow the drive wheels to rotate at different speeds when cornering.
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C
To shift gears automatically based on engine load.
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D
To absorb suspension impacts from uneven roads.
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QUESTION 14 / 25
In automotive chassis design, how does a monocoque (unibody) structure differ from a traditional body-on-frame structure?
Choose one answer below.
A
Monocoque structures use a heavy steel ladder frame with a separate fiberglass cabin bolted on top.
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B
Monocoque structures integrate the chassis frame and body panels into a single load-bearing unit.
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C
Monocoque structures have no suspension mounting points.
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D
Monocoque structures are only used for heavy commercial dump trucks.
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QUESTION 15 / 25
A transfer case in low gear has a gear ratio of 2.72:1. If the transmission output torque entering the transfer case is 200 Nm, what is the output torque exiting the transfer case to the driveshafts (neglecting frictional losses)?
Choose one answer below.
A
73.5 Nm
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B
200.0 Nm
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C
544.0 Nm
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D
1,088.0 Nm
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QUESTION 16 / 25
Which type of fire extinguisher is the safest to use on an active electrical fire involving live equipment in a vehicle workshop?
Choose one answer below.
A
Water extinguisher
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B
Foam extinguisher
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C
Carbon dioxide (CO2) extinguisher
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D
Wet chemical extinguisher
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QUESTION 17 / 25
When raising a vehicle using a hydraulic trolley floor jack, what safety step must be performed before working underneath the vehicle?
Choose one answer below.
A
Leave the trolley jack pumped up under tension and block the wheels.
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B
Lower the vehicle onto rated jack stands placed at designated structural support points.
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C
Keep the vehicle engine running so the power steering remains active.
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D
Place wooden blocks directly on top of the tires to wedge them against the wheel wells.
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QUESTION 18 / 25
When using a standard metric micrometer with a 0.5 mm pitch spindle thread, what distance does one complete 360-degree rotation of the thimble represent?
Choose one answer below.
A
0.01 mm
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B
0.10 mm
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C
0.50 mm
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D
1.00 mm
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QUESTION 19 / 25
Which precision measuring instrument is specifically designed to measure internal cylinder bore taper and out-of-roundness?
Choose one answer below.
A
A thread pitch gauge
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B
A cylinder dial bore gauge
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C
An outside micrometer
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D
A dial indicator with magnetic base
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QUESTION 20 / 25
What is a main advantage of a vernier caliper over a simple steel rule when performing workshop measurements?
Choose one answer below.
A
It can measure internal, external, and depth dimensions with high precision.
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B
It can measure electrical resistance and circuit continuity.
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C
It does not require manual calibration or zeroing.
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D
It automatically adjusts its scale to compensate for thermal expansion of the measured metal.
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QUESTION 21 / 25
Why is it dangerous to use compressed air to blow brake dust off drum brake assemblies?
Choose one answer below.
A
The air pressure will bend the brake backing plate.
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B
Brake dust may contain toxic asbestos fibers or fine particles that become airborne and can be inhaled.
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C
Compressed air will cause the hydraulic wheel cylinders to pop out.
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D
The cold temperature of compressed air will crack the hot brake drums.
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QUESTION 22 / 25
What is the correct procedure for tightening critical fasteners, such as cylinder head bolts, using a torque wrench?
Choose one answer below.
A
Tighten each bolt fully in a clockwise circle starting from the front left.
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B
Tighten them in the manufacturer's specified sequence in progressive torque stages.
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C
Apply anti-seize compound to all threads and torque them 20% past specification.
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D
Tighten them using a pneumatic impact wrench until the tool stalls.
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QUESTION 23 / 25
Why is it unsafe to use a ball-peen hammer that has a loose wooden handle in a workshop environment?
Choose one answer below.
A
The loose handle will absorb too much force, reducing hammer effectiveness.
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B
The steel head can fly off the handle during a swing, causing severe injury or damage.
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C
The loose connection causes the hammer face to strike at an angle, increasing the risk of chipping the hammer face or workpiece.
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D
The handle will splinter instantly upon hitting metal.
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QUESTION 24 / 25
A technician reads an outside metric micrometer. The barrel sleeve shows a reading of 12.5 mm, and the thimble scale aligns with the number 24. What is the total measurement reading?
Choose one answer below.
A
12.24 mm
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B
12.524 mm
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C
12.74 mm
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D
14.90 mm
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QUESTION 25 / 25
An automotive service manual specifies a cylinder head bolt torque of 85 lb-ft. A technician's torque wrench is calibrated in Newton-meters (Nm). If 1 lb-ft = 1.356 Nm, what is the equivalent torque value in Nm (rounded to one decimal place)?
Choose one answer below.
A
62.7 Nm
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B
85.0 Nm
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C
115.3 Nm
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D
150.0 Nm
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