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 2023
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 votes, 0 avg

CDL Driving Knowledge Practice Test

1 / 50

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

2 / 50

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

3 / 50

When aiming the fire extinguisher, you should

4 / 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?

5 / 50

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

6 / 50

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

7 / 50

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

8 / 50

When driving at night, use high beams when

9 / 50

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

10 / 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

11 / 50

What is normal engine oil pressure when idling?

12 / 50

What can happen if your front axles are under loaded?

13 / 50

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

14 / 50

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

15 / 50

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

16 / 50

Why must cargo be covered on an open bed?

17 / 50

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

18 / 50

What is normal engine oil pressure when operating a vehicle?

19 / 50

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

20 / 50

Not all vehicles carrying hazardous materials need to have placards.

21 / 50

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

22 / 50

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

23 / 50

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

24 / 50

You should apply your brakes when turning.

25 / 50

How do you correct a drive wheel braking skid?

26 / 50

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

27 / 50

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

28 / 50

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

29 / 50

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

30 / 50

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

31 / 50

Which of the following cargo need special attention?

32 / 50

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

33 / 50

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

34 / 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?

35 / 50

What are placards used for?

36 / 50

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

37 / 50

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

38 / 50

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

39 / 50

What should you do if a tire blows out?

40 / 50

To avoid glare from oncoming vehicles, you should

41 / 50

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

42 / 50

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

43 / 50

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

44 / 50

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

45 / 50

How can you quickly sober up?

46 / 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.

47 / 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?

48 / 50

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

49 / 50

Which of the following is considered a serious traffic violation?

50 / 50

How often must you check carg

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