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

How do you fix a leaky glad hand?

2 / 20

This yellow sign with the swerving car means what?

3 / 20

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

4 / 20

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

5 / 20

Who can install and repair wheels and tires?

6 / 20

Don't use the differential lock when __________?

7 / 20

Which valves are the tractor protection system?

8 / 20

What does this square sign mean?

9 / 20

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

10 / 20

What does this sign mean?

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

After disconnecting from a trailer, a driver should?

14 / 20

What is a requirement on your daily log?

15 / 20

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

16 / 20

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

17 / 20

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

18 / 20

When inspecting your brakes, you must?

19 / 20

What does this red sign mean?

20 / 20

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

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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.