Dhofar Royal Oman Police - Oman Heavy Vehicle Skills Test 2

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

The official Royal Oman Police truck & bus theory test in Dhofar 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 Dhofar 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 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 2

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 3

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 4

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 5

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 6

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

Question 7

When securing a load on a flatbed truck, what is the key principle regarding load distribution?

Accepted Answer

The load should be spread to keep the centre of gravity as low and as central as possible, with weight distributed evenly across axles within legal limits. Correct load distribution keeps the centre of gravity low and central, reducing rollover risk and keeping axle loads within legal limits. Concentrating weight at the rear reduces steering control, while too much weight at the front can overload the steering axle. Individual axle limits must not be exceeded even if the gross weight is acceptable.

Answer

Heavy items should be placed at the rear of the trailer to improve traction on the drive axle

Answer

The load should be concentrated over the rear axle to maximise the payload rating

Answer

Load position does not matter as long as the total gross weight is within the legal limit

Question 8

A heavy truck is approaching a weight-restricted bridge. The posted limit is 10 tonnes. The truck has a gross vehicle weight of 18 tonnes. What must the driver do?

Accepted Answer

Find an alternative route that can accommodate the vehicle's weight. A weight restriction on a bridge applies to the total vehicle mass. At 18 tonnes gross the truck is almost double the 10-tonne limit and must not cross. Speed is irrelevant to structural load. The driver must plan the route in advance and use roads rated for the vehicle's actual weight.

Answer

Cross slowly and carefully at walking pace to reduce the impact

Answer

Cross if the road is clear of other traffic

Answer

Cross if the load is not exceeding the axle limit shown on the vehicle plate

Question 9

What is the maximum permitted vehicle height generally applied to trucks in Oman before a special permit is required?

Accepted Answer

4.2 metres. Oman generally applies a 4.2-metre height limit for standard vehicles, above which an oversize load permit is required. Drivers must check overhead clearances on gantries and bridges on their specific route. Always confirm the current legally enforced limit with the Royal Oman Police before an oversize move.

Answer

3.5 metres with no permit option available

Answer

5.0 metres with a standard load permit

Answer

4.8 metres for any flatbed truck regardless of load

Question 10

What is the maximum permitted vehicle width generally applied in Oman without a special permit?

Accepted Answer

2.5 metres. A width of 2.5 metres is the standard maximum for commercial vehicles in many GCC countries including Oman. Vehicles wider than this require an oversize permit and often an escort. Drivers should always confirm the current enforced limit with the Royal Oman Police, as regulations can be updated.

Answer

3.0 metres for all commercial vehicles

Answer

2.0 metres, the same as a standard car

Answer

Width limits do not exist in Oman; only length is regulated

Dhofar 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