Al Jouf General Dept. of Traffic - Saudi Heavy Vehicle Skills Test 1

Q: How many questions is the Al Jouf General Dept. of Traffic truck & bus theory test?

The official General Dept. of Traffic truck & bus theory test in Al Jouf has 35 questions and you need 22 correct (63%) to pass. This practice test has 22 questions.

Q: Is this the real exam?

These are practice questions to help you revise, written to the published rules and to what candidates report from the real test. They are not the official Saudi exam and the real question bank, format, fees and pass mark are set by the General Department of Traffic (Moroor) and the driving schools, and can change. Always confirm the current requirements with your driving school or the traffic department.

Q: Is this practice test free?

The first 10 questions are free, with no signup, and each shows the answer and the reason. The full 22-question test, timed, is in the Saudi Driving Theory Online Practice Bank (SAR 39, one payment), with every question in the bank.

Q: What does the Al Jouf truck & bus theory test cover?

Road signs, traffic signals, right of way, roundabouts, speed limits, seat belts, penalties and safe-driving rules, plus the handling and safety topics specific to your vehicle.

Question 1

What type of braking system is fitted to most heavy trucks and buses operating in Saudi Arabia?

Accepted Answer

Pneumatic (air) brakes, which use compressed air to actuate the brake chambers. Most heavy trucks and buses use pneumatic (air) brakes. Compressed air from an onboard compressor actuates brake chambers to apply the wheel brakes. Understanding air-brake operation and the fail-safe spring-brake system is essential for every heavy-vehicle driver.

Answer

Hydraulic disc brakes identical to those fitted on light vehicles

Answer

Electric regenerative brakes that charge the battery on every stop

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Cable-operated drum brakes similar to those used on motorcycles

Question 2

What is brake fade, and which situation most commonly causes it on a heavy truck?

Accepted Answer

A reduction in braking power caused by overheated brake drums or discs, most commonly on long downhill descents when brakes are applied repeatedly. Brake fade is the loss of braking effectiveness that occurs when brake components overheat. On long downhill gradients, repeatedly applying the service brakes heats the drums or discs until they can no longer absorb heat effectively. Always use engine or exhaust brakes to control speed on descents and avoid relying solely on the service brakes.

Answer

A sudden increase in braking force caused by air pressure building up too quickly in the chambers

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The delay between pressing the brake pedal and the air reaching the rear axle chambers

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The locking of the rear wheels caused by excessive brake pedal pressure on a slippery surface

Question 3

What does the low air-pressure warning light or buzzer on a heavy truck indicate?

Accepted Answer

The air pressure in the braking system has fallen below a safe level and you must stop safely as soon as possible. A low air-pressure warning on a heavy truck means the compressed air reservoir pressure has dropped below the minimum threshold for safe brake operation. You must stop the vehicle safely as soon as possible and not move it until the fault is investigated. Driving with low air pressure risks complete brake failure.

Answer

The air conditioning system has lost refrigerant and needs servicing

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The tyre pressures need to be checked at the next fuel stop

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The air suspension has deflated and must be re-inflated before driving

Question 4

A heavy truck fitted with spring-brake actuators is left parked on a slope without connecting the hand-brake control. What happens to the spring brakes if the air pressure in the system drops to zero?

Accepted Answer

The spring brakes apply automatically, holding the vehicle stationary because the springs are released by air pressure and engage when pressure is lost. Spring-brake actuators are a fail-safe device. Compressed air holds the large internal spring in a compressed, released position. When air pressure drops to zero (or below a set threshold), the spring extends and forces the brake on. This is why air-brake equipped trucks automatically apply their parking brakes if the air supply fails.

Answer

The spring brakes release fully, allowing the vehicle to roll freely down the slope

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Nothing changes because spring brakes are independent of air pressure

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The service brakes apply instead, but only on the front axle

Question 5

Why should a driver use the engine brake or exhaust brake on a long downhill gradient rather than relying on the service (foot) brakes alone?

Accepted Answer

To prevent the service brakes from overheating and fading, which could lead to brake failure. Using engine or exhaust brakes on long descents removes the braking load from the service brakes, preventing them from overheating and fading. Brake fade on a descent can lead to complete loss of braking ability. The service brakes should be reserved for supplementary slowing or emergency stops.

Answer

To save fuel because using the engine brake charges the air compressor

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Because service brakes are not permitted on downhill gradients under Saudi regulations

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To keep the engine revs high enough for the alternator to charge the batteries

Question 6

Before descending a long steep grade, a heavy truck driver should select an appropriate gear. What is the correct principle?

Accepted Answer

Select a low gear before reaching the descent so engine braking can hold the truck at a safe speed throughout. The correct principle is to select the appropriate low gear before reaching the descent. Engine braking in a low gear will hold the truck at a safe speed without requiring constant service-brake application. Changing down mid-descent or descending in neutral are dangerous and can lead to runaway speed and brake fade.

Answer

Descend in a high gear to keep engine revs low and reduce noise

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Descend in neutral so the engine does not drag and overheat

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Begin the descent in any gear and change down only if speed rises above the limit

Question 7

How does an exhaust brake (Jake brake or compression release brake) slow a heavy truck?

Accepted Answer

It uses engine compression to retard vehicle speed by opening exhaust valves at the top of the compression stroke, turning the engine into an air compressor. A compression release engine brake (commonly called a Jake brake) opens the exhaust valves at the top of the compression stroke. Instead of recovering the energy of compression on the power stroke, it is vented away, turning the engine into a powerful air compressor that retards the drivetrain and slows the vehicle.

Answer

It partially blocks the exhaust pipe to create back-pressure that slows the driveshaft

Answer

It diverts exhaust gases back into the intake manifold to stall the engine gently

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It applies hydraulic pressure to all four wheel brakes through a separate circuit

Question 8

You are driving a fully laden semi-trailer on a long winding descent in the mountains near Taif. Your speed is gradually increasing even though you are in a low gear with the exhaust brake on. What is the safest immediate action?

Accepted Answer

Apply the service brakes firmly and briefly in repeated short applications to control speed, and seek a runaway truck ramp or safe stopping point. If speed is rising despite engine braking in a low gear, apply the service brakes firmly but in short controlled bursts rather than a long continuous application, which risks overheating. Look for a runaway truck ramp or safe area to stop. Shifting to a higher gear, turning off the engine, or accelerating are all dangerous actions that could cause loss of control.

Answer

Shift to a higher gear to stop the engine over-revving

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Turn the engine off to maximise engine-braking resistance

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Accelerate briefly to match road speed, then re-engage a lower gear

Question 9

Why is correct load distribution important in a heavy truck or trailer?

Accepted Answer

Uneven weight distribution can overload individual axles, reduce steering control, and increase rollover risk. Correct load distribution is critical for safety. Placing too much weight over the rear axle reduces front-axle steering force, while loading weight too far forward overloads the front axle and trailer coupling. An uneven or high load raises the centre of gravity and greatly increases rollover risk, especially in corners.

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It only matters for the comfort of the driver over rough roads

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Load distribution only affects fuel consumption and is otherwise unimportant for safety

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Loads always distribute themselves evenly between axles regardless of placement

Question 10

Which method of load securing is most suitable for preventing a heavy steel coil from rolling on a flatbed trailer?

Accepted Answer

Chocks and chains or straps rated for the coil's weight, positioned to prevent forward, rearward, and lateral movement. A steel coil is a round, heavy, and potentially unstable load. It must be restrained with properly rated chocks to prevent rolling, plus chains or straps to resist fore-and-aft and lateral movement. A single strap or relying on friction alone is inadequate and unlawful.

Answer

A single ratchet strap placed over the top of the coil is sufficient for road transport

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The coil should be placed loose and braked by the trailer's friction surface alone

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Steel coils do not require securing because their weight prevents movement

Al Jouf General Dept. of Traffic - Saudi Heavy Vehicle Skills Test 1

The other 12 questions in this test

What this test covers

Frequently asked questions

Saudi Arabia driving test guides