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.

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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

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

2 / 20

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

3 / 20

Which valves are the tractor protection system?

4 / 20

This yellow sign with the swerving car means what?

5 / 20

What is a requirement on your daily log?

6 / 20

After disconnecting from a trailer, a driver should?

7 / 20

Don't use the differential lock when __________?

8 / 20

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

9 / 20

What does this red sign mean?

10 / 20

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

11 / 20

When approaching a school bus, you must stop when?

12 / 20

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

13 / 20

When inspecting your brakes, you must?

14 / 20

How do you fix a leaky glad hand?

15 / 20

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

16 / 20

Who can install and repair wheels and tires?

17 / 20

What does this square sign mean?

18 / 20

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

19 / 20

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

20 / 20

What does this sign mean?

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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.