Take Cameroon Heavy-Vehicle Theory Practice Questions - Cameroon Driving Theory Test - Categories C, D & E (Heavy & Commercial) Exam

QUESTION 1 / 25

What is the minimum statutory age required to obtain a Category C (heavy goods vehicle) driving licence in Cameroon?

Choose one answer below.

A21 years✓B18 years✓C25 years✓D16 years✓

QUESTION 2 / 25

What prior driving experience is legally required in Cameroon before an applicant can enroll for a Category C driving licence examination?

Choose one answer below.

AMust have held a valid Category B driving licence for at least 2 years✓BMust have held a Category A motorcycle licence for 1 year✓CNo prior licence is required if the candidate passes a physical agility test✓DMust have worked as a mechanic's apprentice for 3 years✓

QUESTION 3 / 25

Outside built-up areas and absent any restrictive signing, what maximum speed does the CEMAC Highway Code set for a goods vehicle of between 3,500 kg and 12,500 kg PTAC, and for public passenger transport vehicles?

Choose one answer below.

A90 km/h✓B110 km/h✓C60 km/h✓D120 km/h✓

QUESTION 4 / 25

In a built-up area (en agglomération), what maximum speed does the CEMAC Highway Code set for a vehicle of more than 3,500 kg?

Choose one answer below.

A40 km/h✓B60 km/h✓C70 km/h✓D80 km/h✓

QUESTION 5 / 25

What is the maximum load the CEMAC Highway Code permits on a single axle, as checked at weighbridge stations (stations de pesage) in Cameroon?

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A13 tonnes✓B10 tonnes✓C16 tonnes✓D20 tonnes✓

QUESTION 6 / 25

What is the maximum permissible tandem axle group (deux essieux / tandem) weight limit under CEMAC transport regulations?

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A21 tonnes✓B13 tonnes✓C27 tonnes✓D32 tonnes✓

QUESTION 7 / 25

What is the maximum overall width the CEMAC Highway Code authorises for a goods vehicle, load included?

Choose one answer below.

A2.50 metres✓B2.60 metres✓C3.00 metres✓D2.20 metres✓

QUESTION 8 / 25

What is the standard maximum authorized vehicle height for all commercial trucks and combinations in Cameroon?

Choose one answer below.

A4.00 metres✓B4.50 metres✓C3.50 metres✓D5.00 metres✓

QUESTION 9 / 25

What is the maximum overall length the CEMAC Highway Code authorises for an articulated vehicle (tracteur routier + semi-remorque)?

Choose one answer below.

A15.50 metres✓B16.50 metres✓C12.00 metres✓D18.00 metres✓

QUESTION 10 / 25

What is the maximum overall length permitted for a drawbar road train (camion porteur + remorque) under the CEMAC Highway Code?

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A18.00 metres✓B18.75 metres✓C15.50 metres✓D12.00 metres✓

QUESTION 11 / 25

How does pneumatic air braking operate to apply the service brakes on a heavy truck?

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ACompressed air generated by an engine-driven compressor is directed into brake chambers to push pushrods, slack adjusters, and expand brake shoes against drums✓BVacuum suction pulls hydraulic fluid from the radiator into the wheels✓CElectrical electromagnets clamp directly onto the tyre rubber✓DEngine exhaust gas is injected into the tyre valves to stop rotation✓

QUESTION 12 / 25

What is the primary function of spring brake actuators (vases à ressort / freins de stationnement à ressort / 'Maxi-Brake') on heavy vehicles?

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AThey use powerful mechanical springs to apply the parking and emergency brakes automatically if air pressure drops below a safe threshold✓BThey absorb road shocks to soften the driver's seat suspension✓CThey increase air pressure inside the fuel injection rail✓DThey deploy mechanical anchors into the road during high-speed stops✓

QUESTION 13 / 25

What warning is triggered inside the cabin if the air brake system pressure drops below the safe operating minimum (typically below 4.5 to 5.5 bars)?

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AA red warning light illuminates and an audible buzzer sounds, warning the driver to stop immediately before spring brakes lock✓BThe vehicle's hazard flashers emit blue light✓CThe engine automatically accelerates to maximum RPM✓DThe air conditioning switches automatically to heating✓

QUESTION 14 / 25

Why is it mandatory for a heavy vehicle driver to drain the moisture drain valves (purger les réservoirs d'air) on pneumatic air tanks daily?

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ATo eliminate accumulated water and oil condensation that causes internal corrosion, valve freezing, and brake system failure✓BTo lubricate the exterior chassis frame with water spray✓CTo reduce the overall weight of the truck for weighbridge compliance✓DTo equalize fuel tank pressures across dual fuel tanks✓

QUESTION 15 / 25

What is an auxiliary retarder (ralentisseur — e.g. Telma electromagnetic retarder or Voith hydraulic retarder) and what is its primary benefit?

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AA driveline braking device that slows the vehicle without using wheel friction brakes, preventing brake overheating on long descents✓BAn electric motor that accelerates the vehicle up steep inclines✓CA device that increases diesel fuel injection pressure during overtaking✓DA steering damper that prevents tyre puncture deflections✓

QUESTION 16 / 25

How does an exhaust brake (frein sur échappement / papillon d'échappement) assist in slowing down a heavy diesel truck?

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AIt closes a butterfly valve in the exhaust manifold, creating backpressure in the engine cylinders that resists piston motion on the exhaust stroke✓BIt sprays water into the exhaust tailpipe to create steam resistance✓CIt cuts off the electrical power to all headlights and cabin lights✓DIt injects air into the turbocharger compressor to reverse engine rotation✓

QUESTION 17 / 25

What is 'brake fade' (évanouissement ou échauffement des freins) and why is it extremely dangerous on steep descents (e.g. Falaise de Dschang)?

Choose one answer below.

AFriction linings and brake drums overheat from prolonged use, causing the friction coefficient to drop drastically and leading to total loss of braking ability✓BThe brake pedal falls off the floorboard linkage due to vibrations✓CAir compressor belts freeze due to cold mountain air✓DThe engine alternator overcharges the vehicle battery✓

QUESTION 18 / 25

What is the proper technique for descending a long, steep grade in a fully loaded Category C truck?

Choose one answer below.

ASelect the appropriate low gear before starting the descent, activate the auxiliary retarder/exhaust brake, and use snub braking (short, firm brake applications) only when necessary to control speed✓BShift into neutral to save fuel and maintain continuous light pressure on the footbrake✓CDescend in top gear at 90 km/h and pull the parking brake whenever speed exceeds 100 km/h✓DTurn off the engine ignition key to maximize engine vacuum✓

QUESTION 19 / 25

How does vehicle gross weight (laden mass) affect the kinetic energy and stopping distance of a heavy truck?

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AKinetic energy is directly proportional to vehicle mass; a fully loaded 40-tonne truck carries more than 10 times the kinetic energy of an empty 4-tonne truck at the same speed✓BGross weight has no effect on kinetic energy or braking requirements✓CHeavier trucks stop in shorter distances because extra weight pushes tyres harder into the asphalt✓DStopping distance decreases by 50% when the vehicle is loaded to maximum payload✓

QUESTION 20 / 25

What is the danger of loading heavy freight with a high centre of gravity (centre de gravité élevé) in a commercial truck?

Choose one answer below.

AGreatly increases centrifugal tipping forces on curves and roundabouts, dramatically raising the risk of vehicle rollover✓BIncreases engine oil pressure to dangerous levels✓CCauses the vehicle's electrical alternator to burn out✓DMakes the air conditioning blow warm air✓

QUESTION 21 / 25

When loading a heavy goods vehicle, how should the payload be distributed across the cargo bed?

Choose one answer below.

AEvenly distributed across the floor, with the heaviest items placed lowest and centred over the main chassis axles, securely tied down✓BConcentrated entirely against the rear tailgate to lighten steering effort✓CStacked as high as possible in the front right corner of the trailer✓DDistributed solely on the outer perimeter with the centre empty✓

QUESTION 22 / 25

What is the phenomenon known as 'off-tracking' (effet de balayage / différence de trajectoire) when a long semi-trailer turns a corner?

Choose one answer below.

AThe rear wheels of the trailer follow a tighter turning radius (track inside) than the front steering wheels of the tractor✓BThe trailer wheels track wider to the outside of the turn than the cab✓CThe trailer automatically uncouples if the steering angle exceeds 30 degrees✓DThe front cab wheels lose contact with the road on sharp turns✓

QUESTION 23 / 25

What is a 'jackknife' (mise en portefeuille) in an articulated semi-trailer combination and what causes it?

Choose one answer below.

AThe tractor drive wheels lock or lose lateral traction, causing the tractor and trailer to swing uncontrollably toward each other like a closing folding knife✓BThe trailer kingpin breaks and the trailer falls flat onto the road surface✓CThe engine stalls while climbing a hill and the truck rolls backwards✓DThe steering wheel spins freely due to broken steering column splines✓

QUESTION 24 / 25

When coupling a tractor unit to a semi-trailer, what is the crucial visual check that must be performed under the fifth wheel (sellette d'attelage)?

Choose one answer below.

AVerify with a flashlight that the locking jaws (mâchoires de verrouillage) have completely closed around the kingpin (cheville ouvrière) and the safety release lever is locked✓BCheck that the fifth wheel plate is completely dry without any grease✓CCheck that the trailer landing gear legs are touching the ground✓DVerify that the rear mudguards have been removed✓

QUESTION 25 / 25

What is the standard colour coding and function of the two pneumatic brake lines connecting a tractor to a semi-trailer?

Choose one answer below.

ARed line is the supply/emergency line (conduite d'alimentation); Yellow line is the service control line (conduite de commande)✓BRed line is for electrical lighting; Yellow line is for air conditioning✓CRed line is for diesel fuel transfer; Yellow line is for engine oil return✓DRed line is for exhaust gas; Yellow line is for drinking water✓