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

3 / 50

You should apply your brakes when turning.

4 / 50

Which of the following is considered a serious traffic violation?

5 / 50

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

6 / 50

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

7 / 50

Why must cargo be covered on an open bed?

8 / 50

What can happen if your front axles are under loaded?

9 / 50

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

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

When driving at night, use high beams when

12 / 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.

13 / 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?

14 / 50

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

15 / 50

To avoid glare from oncoming vehicles, you should

16 / 50

Not all vehicles carrying hazardous materials need to have placards.

17 / 50

What should you do if a tire blows out?

18 / 50

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

19 / 50

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

20 / 50

What are placards used for?

21 / 50

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

22 / 50

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

23 / 50

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

24 / 50

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

25 / 50

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

26 / 50

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

27 / 50

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

28 / 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?

29 / 50

When aiming the fire extinguisher, you should

30 / 50

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

31 / 50

What is normal engine oil pressure when operating a vehicle?

32 / 50

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

33 / 50

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

34 / 50

How do you correct a drive wheel braking skid?

35 / 50

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

36 / 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?

37 / 50

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

38 / 50

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

39 / 50

How can you quickly sober up?

40 / 50

Which of the following cargo need special attention?

41 / 50

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

42 / 50

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

43 / 50

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

44 / 50

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

45 / 50

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

46 / 50

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

47 / 50

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

48 / 50

What is normal engine oil pressure when idling?

49 / 50

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

50 / 50

How often must you check carg

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