Ontario Commercial Drivers License Class D 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

Ontario Class D Practice Test 4

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

1 / 20

Correct belt tension for an air compressor can be determined by

2 / 20

What does this yellow diamond sign mean?

3 / 20

As a driver you are expected to practice _________?

4 / 20

Activation of trailer spring brakes can be checked by?

5 / 20

What information does a CVOR record contain?

6 / 20

Overheated brakes are?

7 / 20

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

8 / 20

What does this black and white sign mean?

9 / 20

System air loss should be measured by applying the brake for how long?

10 / 20

Finding a small bit of oil during an inspection is no cause for concern if its coming from the _____________?

11 / 20

What does this arrow sign mean?

12 / 20

Which party is responsible for ensuring correct and compliant weight of a shipment?

13 / 20

What is the maximum width a commercial vehicle can be?

14 / 20

What do you do if you get stuck over railway tracks?

15 / 20

Cut out pressure level must never exceed __________.

16 / 20

How much stopping distance does a truck need compared to a normal car?

17 / 20

Your truck or other commercial vehicle must be have?

18 / 20

What does CVOR stand for?

19 / 20

What does this white sign with a "not permitted" cross mean?

20 / 20

What does this yellow sign mean?

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Want to know more? Learn all about getting your DZ 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.