Al Dakhiliyah Royal Oman Police - Oman Heavy Vehicle Skills Test 2

Q: How many questions is the Al Dakhiliyah Royal Oman Police truck & bus theory test?

The official Royal Oman Police truck & bus theory test in Al Dakhiliyah has 30 questions and you need 23 correct (75%) 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 Oman exam and the real question bank, format, fees and pass mark are set by the Royal Oman Police, and can change. Always confirm the current requirements with your driving school or the Royal Oman Police.

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 Oman Driving Test Questions PDF (ROP) (OMR 3, one payment), with every question in the bank.

Q: What does the Al Dakhiliyah 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

Why does a long articulated truck need to swing wide before turning right at an intersection in Oman?

Accepted Answer

The trailer wheels cut the corner and follow a tighter path than the cab, so the driver must position the cab wide to allow the trailer to clear the kerb. On a long articulated vehicle the rear trailer wheels track inside the path of the front wheels. If the driver turns without first swinging the cab wide, the trailer will cut across the corner and may mount the kerb, strike a pedestrian, or damage a structure. This off-tracking is proportional to the length of the trailer.

Answer

The steering is located on the right side of the cab, requiring extra space to operate

Answer

The length of the trailer increases the turning radius of the front wheels

Answer

Swinging wide reduces tail swing on the left side of the vehicle

Question 2

What is tail swing and when is it most dangerous for pedestrians?

Accepted Answer

The rear of the cab swings outward in the opposite direction to the turn; it is most dangerous during slow tight turns such as when entering or leaving a depot. When a truck turns, the rear of the cab or rigid body sweeps outward on the opposite side from the direction of turn. This tail swing can sweep a pedestrian standing nearby even though they appear to be clear of the vehicle. Drivers must check mirrors and ensure no-one is in the tail-swing zone before manoeuvring.

Answer

The trailer swings toward the outside of a bend at high speed; most dangerous on motorways

Answer

The drive axle shifts sideways during heavy braking; most dangerous on wet roads

Answer

The fifth wheel slides forward during cornering; most dangerous when unladen

Question 3

A fully loaded truck requires a much longer stopping distance than a car at the same speed. What is the primary reason for this?

Accepted Answer

Greater mass means far more kinetic energy must be absorbed by the brakes. Greater mass dramatically increases kinetic energy (KE = 0.5 x m x v squared), so the brakes must absorb far more energy to stop the vehicle. This is why drivers must allow at least double the following distance of a car and begin braking much earlier, especially when loaded.

Answer

Truck tyres have less grip than car tyres

Answer

Air brakes respond more slowly than hydraulic brakes in all conditions

Answer

Trucks have fewer braking wheels than cars relative to their size

Question 4

On which side of a left-hand-drive truck driving in Oman is the largest blind spot located?

Accepted Answer

The right (passenger) side. In a left-hand-drive truck (standard in Oman where traffic drives on the right), the driver sits on the left. The right (passenger) side is furthest from the driver, creating the largest blind spot. Mirrors must be correctly adjusted, but a significant zone on the right near the trailer still cannot be seen.

Answer

The left (driver) side

Answer

Directly behind the trailer

Answer

Directly in front of the cab

Question 5

What is brake fade and when is it most likely to occur on a heavy vehicle?

Accepted Answer

A reduction in braking power caused by overheated brake drums or discs, most likely on long descents. Brake fade occurs when repeated or prolonged braking generates so much heat in the drums or discs that friction is reduced and stopping power drops sharply. It is most dangerous on long mountain descents such as the Jebel Akhdar road. Drivers must use engine or exhaust brakes to control speed and avoid riding the service brakes.

Answer

Air leaking from the brake chambers, most likely in cold weather

Answer

A gradual increase in brake pedal travel caused by worn brake shoes

Answer

The ABS cutting in repeatedly on a wet road

Question 6

When descending a steep mountain pass such as the Jebel Akhdar road in a loaded truck, what is the correct technique to control speed?

Accepted Answer

Select a low gear before the descent and use the engine or exhaust brake as the primary speed control, applying service brakes briefly and sparingly if needed. The correct technique is to engage a low gear before the descent begins and rely on engine or exhaust braking as the primary speed limiter. Service brakes should only be used in short, firm applications. Continuous brake application causes heat build-up and brake fade, which can result in total loss of stopping power on a steep mountain road.

Answer

Select a high gear to reduce engine braking and use the service brakes continuously to maintain a steady speed

Answer

Disengage the clutch and coast in neutral, braking gently to keep the speed constant

Answer

Select the highest gear available to keep engine speed low and reduce fuel consumption

Question 7

What is an exhaust brake (also called a Jake brake or engine retarder) used for on a heavy truck?

Accepted Answer

To slow the vehicle using engine compression resistance, reducing reliance on the service brakes during descents. An exhaust brake restricts exhaust gas flow to create back-pressure, turning the engine into a compression retarder. This slows the vehicle without using the service brakes, which is critical on long descents to prevent brake fade. It is especially important on mountain roads in Oman such as the Jebel Akhdar and Al Hajar passes.

Answer

To increase engine power when climbing steep hills with a heavy load

Answer

To lock the rear wheels for controlled emergency stops

Answer

To release the parking brake automatically when the driver selects a drive gear

Question 8

A truck's air brake system shows a low air pressure warning. What should the driver do?

Accepted Answer

Stop safely as soon as possible and not move the vehicle until the fault is found and repaired. Air brakes rely entirely on compressed air. If pressure drops below a safe threshold the spring-loaded parking brake automatically applies, but continuing to drive risks total brake failure before that happens. The driver must stop safely immediately and not move the vehicle until the system is repaired. Driving with low air pressure is extremely dangerous and illegal.

Answer

Continue driving slowly at low speed until the air compressor rebuilds pressure

Answer

Switch to the secondary hydraulic brake circuit and continue the journey

Answer

Apply the parking brake and drive on, as it will compensate for reduced air pressure

Question 9

What happens to a truck's air brakes if the air supply completely fails?

Accepted Answer

The spring-loaded parking brakes automatically apply, locking the vehicle. Air brake systems are fail-safe: spring-loaded (spring-applied) brakes are held off by air pressure. If air pressure is lost, the springs push the brakes on, locking the vehicle in place. This is a safety design, but it also means the driver loses the ability to release the brakes without restoring air pressure.

Answer

The brakes release fully, leaving the driver with no stopping ability

Answer

The ABS takes over and modulates hydraulic brake pressure

Answer

The retarder activates automatically to slow the vehicle

Question 10

How does cargo load affect the braking distance of a heavy truck?

Accepted Answer

A fully loaded truck has a significantly longer braking distance than the same truck unladen, because of the greater mass. Greater mass increases kinetic energy, so a loaded truck needs considerably more distance to stop than the same truck running empty. The braking system may not be proportionally more powerful, so drivers must adjust their speed and following distance according to the load being carried.

Answer

A fully loaded truck brakes shorter because the extra weight increases tyre grip

Answer

Load has no effect on braking distance as long as the brakes are correctly adjusted

Answer

An unladen truck always has the longest braking distance due to reduced tyre contact

Al Dakhiliyah Royal Oman Police - Oman Heavy Vehicle Skills Test 2

The other 12 questions in this test

What this test covers

Frequently asked questions

Oman driving test guides