CDL GENERAL KNOWLEDGE PRACTICE TEST – 01

This CDL general knowledge practice test will examine your knowledge of general trucking, safe transportation of cargo, safe driving, and the correct way to perform a pre-trip vehicle inspection. 

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General Knowledges Test 01

1 / 30

As you check your signal lights, you should...?

2 / 30

When you are on the road, you must fasten your seatbelt...?

3 / 30

Side marker reflectors which are not at the rear of the vehicle must be what color?

4 / 30

To check the stopping action of your service brakes, you should test them at about...?

5 / 30

All tires other than the front tires of a commercial vehicle must have a minimum tread depth of...?

6 / 30

A vehicle must be placed out of service if what fraction of the leaves in any spring assembly on the suspension are broken?

7 / 30

What is the proper color at the front of a vehicle for parking, clearance and identification lights?

8 / 30

Before starting the engine on a manual vehicle you should make sure your gearshift is in...?

9 / 30

Front facing turn signals must be what color?

10 / 30

If your vehicle has hydraulic brakes, you should pump the brake pedal three times and then apply firm pressure for five seconds. The pedal should...?

11 / 30

If you are transporting a cargo you must inspect its securement within what distance of starting a trip?

12 / 30

When checking the steering system, it must be tested...?

13 / 30

After your first in trip inspection of the securement of your cargo, you must make regular additional inspections...?

14 / 30

Rear turn signals should be which of these colors?

15 / 30

Air pressure for your brakes should build from 50 to 90 psi within what time?

16 / 30

The most important reason for inspecting your vehicle before traveling is...?

17 / 30

Which of these senses should be used during a trip to check for problems?

18 / 30

Every major groove on the front tires of a commercial vehicle must have a tread depth of at least?

19 / 30

What paperwork should you check before beginning your pretrip inspection?

20 / 30

Which of these is permitted for use on the front wheels of the bus?

21 / 30

If your oil pressure is below the indicated limit, you should...?

22 / 30

Side marker lights must be what color at the rear of the vehicle?

23 / 30

The second step of a pretrip inspection should be to check...?

24 / 30

As part of your safety equipment, your vehicle should have how many red reflective triangles?

25 / 30

Why should you look under your vehicle at the beginning of your pretrip inspection?

26 / 30

If a yellow light on the left rear of the trailer stays on when you switch the engine on, this means...?

27 / 30

Wheels or rims are unsafe if they have been welded...?

28 / 30

If lock nuts on your wheels have streaks of rust, this may indicate...?

29 / 30

What is the main problem which a broken exhaust system can cause?

30 / 30

On a 20 inch steering wheel, there should not be more than how much play?

Your score is

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This comprehensive CDL general knowledge practice test is designed to assess your understanding of essential trucking concepts, safe cargo transportation, responsible driving practices, and the proper procedures for conducting a thorough pre-trip vehicle inspection. Passing your state’s official CDL General Knowledge exam is a crucial step in obtaining your Commercial Driver’s License (CDL). To help you prepare effectively, we offer a completely free CDL practice test, including the CDL General Knowledge Test that covers all the key topics you need to know. Take advantage of this resource to boost your confidence and knowledge before the official exam!