Ontario Commercial Drivers License Class A Practice Test 4

Commercial Driver HQ is a website focused on helping new commercial drivers in all provinces and territories in Canada.

Our FREE practice tests are designed to help you succeed when it comes time to write the real test.

Each license type has 5 tests to help you study and become familiar with the rules and regulations of commercial driving. The tests are not identical to the license test you will need to pass, but the questions are similar to what you will find on the real deal.

Compatible on desktop, mobile, and tablet, you can take these tests anywhere you have internet access.

Take the practice test!

Created by Commercial Driver HQ

Class A Ontario Practice Test 4

A 20 question practice test to help prepare you for the Class AZ knowledge test in Ontario

1 / 20

What does this red sign mean?

2 / 20

Test the low pressure alarm with the air pressure above __________.

3 / 20

The supply tank should discharge more moisture than any other tank?

4 / 20

When performing a normal stop, how should you press the brake pedal?

5 / 20

After an inspection you find major defects in some parts, what do you do?

6 / 20

How many off duty hours must a driver have in a day?

7 / 20

When should you be ready to stop for a school bus?

8 / 20

After disconnecting from a trailer, a driver should?

9 / 20

What is a requirement on your daily log?

10 / 20

How do you fix a leaky glad hand?

11 / 20

What does this sign mean?

12 / 20

If brake chambers on opposite side of an axle are different sizes, this may cause?

13 / 20

This yellow sign with the swerving car means what?

14 / 20

When approaching a school bus, you must stop when?

15 / 20

Before driving down a grade (hill), you should?

16 / 20

Which valves are the tractor protection system?

17 / 20

Don't use the differential lock when __________?

18 / 20

Who can install and repair wheels and tires?

19 / 20

When inspecting your brakes, you must?

20 / 20

What does this square sign mean?

Thanks for taking the practice test!

Enter your info to sign up for our mailing list or click "See Result" to move on.

Your score is

The average score is 89%


Want to know more? Learn all about getting your AZ drivers license in Ontario

We do our best to keep the questions current and accurate. The testing centres may change the questions on the knowledge tests at any time. Always be prepared for surprises.

Many of the answers to the questions can be found in the driver hand books or learning materials your province provides.

DISCLAIMER: CDHQ is not affiliated with DriveTest or the MTO. These practice tests should not be considered official tests and you are not granted a license for completing them. Our tests are simply a practice tool to help prepare yourself for the real test.