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Total Questions 81
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Vehicle condition

You're driving a new articulated lorry that's fully laden. You notice that the steering feels heavy. What's the most likely reason?

How frequently should the components of a fifth-wheel coupling be inspected?

Where can you get advice to help carry out minor repairs?

What should you do if the brake pedal becomes hard to press?

When should anti-freeze be used in the cooling system?

You notice that one of your tyres has a bulge in the side wall. What will happen if you drive the vehicle?

What does this warning light on the instrument panel mean?

www.drivingtheorytest.uk - Vehicle condition - What does this warning light on the instrument panel mean? You should be familiar with all warning lights and buzzers fitted to your vehicle. If you're driving the vehicle for the first time, make sure that you know the function of each. If the brake warning light shows a fault in the system, stop as soon as it's safe to do so. Report the fault, and don't continue until it's been corrected.

At a Driver and Vehicle Standards Agency (DVSA) roadside check, your vehicle is found to have serious defects and you may no longer use it. Who will DVSA share this information with?

What do heated fuel lines prevent?

Where does a high-pressure fuel injector deliver fuel?

What should you do before changing a wheel on your vehicle?

While driving, your engine-oil warning light comes on. Why could it be dangerous to continue driving?

Why do air tanks on brake systems need to be drained?

When should your lorry coupling system (fifth wheel) be checked and lubricated?

When would you use 'kickdown' on a vehicle that has automatic transmission?

How can vehicle breakdowns be reduced?

You're about to start a long journey midway through the day. What should you do if you notice that the sidelights work but the headlights are faulty?

What does this warning light on the instrument panel mean?

www.drivingtheorytest.uk - Vehicle condition - What does this warning light on the instrument panel mean? You should be familiar with all the warning lights fitted to your vehicle. The oil warning light indicates low oil pressure or lack of oil. If it lights up, report the fault and don't continue until it's been corrected.

What would be illegal?

You've stopped on a firm, level surface. What's the first thing you must do before you uncouple the trailer?

What should you do if thick black smoke is coming from the exhaust of your vehicle?

Which tool is essential for fitting a road wheel?

What should you check before you drive off a muddy building site onto the road?

What could happen if there isn't enough oil in your engine?

You hit the kerb at speed. What part of your vehicle should you check for damage?

What will happen if you follow a regular vehicle maintenance schedule?

What's the minimum depth of tread required over three-quarters of the breadth of a lorry tyre?

Where can you get advice about carrying out repairs to your vehicle?

What's the purpose of the oil filter?

Why should you carry out a daily walk-round check before setting off?

On your daily walk-round check, you see that one front tyre is more than 10 years old. What should you do before using the vehicle?

When should you check the oil level in your engine?

You're checking your vehicle's tyres before starting a long motorway journey. What check should be made on each tyre?

What happens to diesel fuel when it gets hot?

What's the most likely reason for a diesel-engined vehicle running erratically in very cold weather?

What could happen if you overfill your engine with oil?

When can 'selective' or 'block' gear changing be used?

What's the main reason for cleaning your wheels and tyres when you leave a building site?

What could happen if you overfill your engine with oil?

What should you do if your power-assisted steering fails suddenly?

Why should you use an approved coolant solution in your engine's cooling system?

When should wheel nuts be checked?

www.drivingtheorytest.uk - Vehicle condition - When should wheel nuts be checked? Always have wheel nuts checked soon after their initial tightening. They should be tightened to the torque specified by the vehicle manufacturer.

What would you secure with a dog clip?

Your vehicle suffers a tyre blow-out. How could this create a hazard for other road users?

Your vehicle has broken down at night on a two-way road. How should you try to leave the vehicle?

What should you check for wear or damage on a drawbar unit?

In very cold weather, moisture can freeze in your vehicle's air storage tanks. What can you do to help prevent this from happening?

What's it advisable to do when you replace a tubeless tyre?

You discover that one of your rear brake-light bulbs has failed. How soon should it be replaced?

Where should you park your vehicle before checking the engine oil level?

What's the most likely cause if your steering starts to feel heavy?

What's the final thing you should do after recoupling a trailer?

What's the advantage of energy-saving tyres?

Why are energy-saving tyres effective?

You're driving a lorry along a motorway. You notice that you're losing tread from one of your tyres. What should you do?

You're uncoupling a trailer. What must you do before disconnecting any of the air lines?

What's most likely to cause a burst tyre?

What proportion of the width of a tyre must have at least the legal minimum depth of tread?

Before starting a journey, you want to check your brake-system warning lights. What can you do when these aren't operated by the ignition switch?

You're checking your vehicle. What should you do if you discover an air leak in the braking system?

Your steering suddenly becomes heavy to turn. What could make this happen?

A tyre has been replaced on your vehicle. What precautions should be taken when tightening the wheel nuts?

You've had to change a wheel on your vehicle. When should the wheel nuts be checked again?

What's the fifth-wheel coupling used for?

The Driver and Vehicle Standards Agency (DVSA) and the police carry out spot checks for faulty vehicles. What will happen to the vehicle if serious defects are found?

You're driving along a motorway. What should you do if the air-pressure warning device starts to operate?

What can you add to diesel fuel to prevent it from becoming less effective at low temperatures?

What do the codes shown on the side walls of bus and lorry tyres refer to?

Bus and lorry tyres have codes on their side walls. What do these codes refer to?

On motorways, you're usually driving at higher speeds for long distances. What effect can this have on your tyres?

Why should your engine oil be changed at the recommended intervals?

What's the purpose of a preheating device?

www.drivingtheorytest.uk - Vehicle condition - What's the purpose of a preheating device? Most diesel engines have glow plugs to preheat the combustion chambers, so helping the engine to start when it's cold. When the ignition is switched on, the preheat warning lamp will show and the glow-plugs will rapidly heat up.
In cold weather, the starter should only be operated when the glow plugs reach operating temperature and the warning light goes out.

What should you do if you notice that two wheel nuts are missing from one of the wheels on your vehicle?

What does it mean if the ignition warning light comes on while you're driving?

www.drivingtheorytest.uk - Vehicle condition - What does it mean if the ignition warning light comes on while you're driving? The ignition light should go out when the engine has started. If it fails to go out or comes on while you're driving, it means that there's an electrical fault of some kind.

What must vehicle operators provide for their drivers?

Your vehicle has double rear wheels. Why should you check them before leaving a building site?

A loud buzzer sounds in your vehicle. What's this most likely to indicate?

How often should the components of the fifth-wheel coupling be inspected?

Why is it important to avoid overfilling the engine with oil?

When should you check the wheel nuts on your vehicle?

How can you check the age of a tyre fitted to your vehicle?

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