LGV/HGV Question List - Vehicle condition


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

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

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

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

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

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

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

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

9 When should wheel nuts be checked? Vehicle condition - When should wheel nuts be checked?
10 What would you secure with a dog clip?

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

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

13 What's the fifth-wheel coupling used for?

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

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

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

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

18 What would be illegal?

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

20 What does this warning light on the instrument panel mean? Vehicle condition - What does this warning light on the instrument panel mean?
21 You're driving along a motorway. What should you do if the air-pressure warning device starts to operate?

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

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

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

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

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

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

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

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

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

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

32 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?

33 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?

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

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

36 What's the purpose of a preheating device? Vehicle condition - What's the purpose of a preheating device?
37 Where does a high-pressure fuel injector deliver fuel?

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

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

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

41 When should you check the oil level in your engine?

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

43 What does this warning light on the instrument panel mean? Vehicle condition - What does this warning light on the instrument panel mean?
44 What does it mean if the ignition warning light comes on while you're driving? Vehicle condition - What does it mean if the ignition warning light comes on while you're driving?
45 What do the codes shown on the side walls of bus and lorry tyres refer to?

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

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

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

49 How can vehicle breakdowns be reduced?

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

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

52 What could happen if you overfill your engine with oil?

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

54 When should you check the wheel nuts on your vehicle?

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

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

57 What's most likely to cause a burst tyre?

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

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

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

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

62 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?

63 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?

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

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

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

67 What's the advantage of energy-saving tyres?

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

69 Why are energy-saving tyres effective?

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

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

72 What could happen if you overfill your engine with oil?

73 What's the purpose of the oil filter?

74 Which tool is essential for fitting a road wheel?

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

76 What do heated fuel lines prevent?

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

78 What happens to diesel fuel when it gets hot?

79 What must vehicle operators provide for their drivers?

80 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?

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