CDL Knowledge Practice Questions Answers (Explanation)

CDL Knowledge Practice Questions Answers with Explanation: There are 50 multiple choice question answers with true-false items. Commercial Driver’s License Permit Test (CDL) in the USA: As part of the “General” Knowledge test, you will be expected to know how to inspect a vehicle and drive safely.

Federal and state laws require that you inspect your vehicle; federal and state inspectors may also check your vehicle. If a vehicle is deemed unsafe, it must be put “out-of-service” until issues are fixed.

CDL Knowledge Practice Questions Answers

CDL Knowledge Practice Questions Answers (Explanation)

Test Name CDL Practice Test 2025
Language English
License CDL (Class A, B, or C),
Total Questions 50 Knowledge Practice Test
Test For Commercial Driver License
Test Preparation Driving Knowledge
Country USA
Explanation Yes
0%
0 votes, 0 avg
250

CDL Driving Knowledge Practice Test

1 / 50

You cannot inspect sealed loads, but you should check that you do not exceed gross weight and axle weight limits.

2 / 50

What is used in the front, back, and/or sides of a piece of cargo to keep it from sliding?

3 / 50

The law prohibits driving under the influence of controlled substances, which includes a variety of prescriptions and over-the-counter drugs such as cold medicines that may make a driver drowsy or affect driving ability.

4 / 50

All of the following can be causes of vehicle fires, except:

5 / 50

Clearing under a bridge when your CMV was loaded does not mean it will clear it when you are empty.

6 / 50

What is normal engine oil pressure when idling?

7 / 50

If your driver license says corrective lenses are required, it is illegal to move a vehicle without corrective lenses.

8 / 50

Not all vehicles carrying hazardous materials need to have placards.

9 / 50

Why should you check v-belt tightness in your vehicle?

10 / 50

Under what conditions may it not be safe to operate a vehicle at legal maximum weights?

11 / 50

You can drive a vehicle that carries hazardous materials if it does not require placards, even if you do not have a HazMat endorsement

12 / 50

What is the minimum number of tie-downs for any flatbed load?

13 / 50

What is normal engine oil pressure when operating a vehicle?

14 / 50

When stopping at a railroad-highway crossing, you should turn on your 4 way emergency flashers.

15 / 50

When large vehicles are being driven in a caravan on the open highway, at least how many feet must be left between them to allow other vehicles to overtake and pass them?

16 / 50

For a cargo fire in a van or box trailer, you should open the doors to cool the fire.

17 / 50

How do you correct a drive wheel braking skid?

18 / 50

A regular dry chemical fire extinguisher can be used on what class of fire?

19 / 50

There are special braking procedures to follow when braking in a vehicle equipped with an ABS system.

20 / 50

When driving at night, use high beams when

21 / 50

Bright lights at night can cause dirt on your windshield or mirrors to create a glare of its own, blocking your view.

22 / 50

The Anti-lock Braking System is only activated when wheels are about to lock up.

23 / 50

All of the following defects can let poison fumes into the cab or sleeper berth, except

24 / 50

All placarded vehicles must have at least how many identical placards displayed?

25 / 50

When driving in fog in the daytime, you should use your high beams.

26 / 50

If you are stopping to help in an accident, you should park near the accident.

27 / 50

What should you do if a tire blows out?

28 / 50

When transporting hazardous materials, shipping papers must be kept in or on:

29 / 50

You should apply your brakes when turning.

30 / 50

When temperature drops, bridges will freeze before the roads will.

31 / 50

What can happen if your front axles are under loaded?

32 / 50

If you operate a CDL required vehicle in interstate commerce, the vehicle, with few exceptions, is required to be registered under the

33 / 50

What is the purpose of an anti-lock braking system?

34 / 50

How often must you check carg

35 / 50

Air pressure in a vehicle should build from 50 to 90 psi within?

36 / 50

The value specified by the manufacturer as the loaded weight of a single vehicle is

37 / 50

How can you quickly sober up?

38 / 50

When aiming the fire extinguisher, you should

39 / 50

Which of the following cargo need special attention?

40 / 50

Why must cargo be covered on an open bed?

41 / 50

To avoid glare from oncoming vehicles, you should

42 / 50

All of the following are signs of a tire failure, except:

43 / 50

What is the minimum number of tie-downs for a 40 foot load?

44 / 50

What type of railroad crossing has a traffic control device installed to regulate traffic at the crossing?

45 / 50

Water can be used on which of the following fire types?

46 / 50

You may NEVER drink while on duty, nor consume any intoxicating beverage, regardless of its alcohol content, within how many hours before going on duty?

47 / 50

What are placards used for?

48 / 50

In the case of towed units manufactured before ABS was required by the DOT, how do you tell if the vehicle is equipped with ABS?

49 / 50

If the Anti-Lock Braking System is working properly, the ABS light will stay on.

50 / 50

Which of the following is considered a serious traffic violation?

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