Ontario Commercial Drivers License Class D Practice Test 1

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

Ontario Class D Practice Test 1

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

1 / 20

Class D license holders under age 80 must pass a knowledge and vision test every?

3 Years

Year

Never

5 Years

2 / 20

When you license is suspended you _________.

Cannot drive

Must drive with a licensed driver

May drive only for work

May drive during the day

3 / 20

Tired drivers are often compared to?

Good drivers

Productive drivers

Impaired drivers

Busy drivers

4 / 20

A broken yellow line on the pavement to the left of you means what?

You may pass when clear

Do not pass

Trucks stay right

Two way street

5 / 20

If you see an open truck inspection station which driving your truck, you must?

Only stop if you have not been inspected recently

Decide whether or not you want to stop

Wait for an inspector to direct you into the station

Stop at the inspection stations for an inspection

6 / 20

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

10 times as much

2 times as much

6 times as much

3 times as much

7 / 20

What colour are the lights on a school bus arm?

Yellow

Red

Green

Blue

8 / 20

What does this yellow diamond sign mean?

Narrow pavement up ahead

Narrow bridge up ahead

Pavement ends

Sharp bend in the road

9 / 20

What is the most frequent reason a vehicle is removed from service?

Air brakes

Over weight limits

Sleepy drivers

Tire treads

10 / 20

To apply for a Class D license you must be?

Any age

16 years old

18 years old

21 years old

11 / 20

What does this yellow sign mean?

Children crossing

Playground area

Watch for pedestrians

Business area up ahead

12 / 20

What does a governor do in an air brake system?

Regulates the tire pressure

Limits the speed by using automatic braking

Tells the other brakes what do to

Regulates the air pressure

13 / 20

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

413 kPa (60 psi)

551 kPa (80 psi)

620 kPa (90 psi)

827 kPa (120 psi)

14 / 20

What is the "cut in" level?

The pressure level that triggers the governor to turn on the air compressor

The safest pressure level you can turn off the truck at

The pressure level that triggers the governor to cut off the air compressor

The maximum speed the air brakes can stop at

15 / 20

What does this sign mean?

No through traffic at this interestion

One way street

No left turns at this intersection

No right turns at this intersection

16 / 20

What does this speed sign mean?

The limit of cars for the bridge

The truck weight limit

The speed limit changes up ahead

The current speed limit

17 / 20

Spring brakes will begin to apply when the pressure starts to drop below?

242 kPs (35 psi)

413 kPa (60 psi)

380 kPa (55 psi)

551 kPa (80 psi)

18 / 20

What does this upside down triangle sign mean?

Yield the right of way

Slow moving vehicle

Come to a complete stop

Railway crossing

19 / 20

The maximum allowable height for a road vehicle is?

5.25 m

4.10 m

3.65 m

4.15 m

20 / 20

What is the best way to inspect an air compressor?

With the engine on and in high gear

With the engine on in first gear

With the engine off

With the engine on in neutral

Thanks for taking the practice test!

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

NameEmail

Your score is

The average score is 84%

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

More Ontario Commercial Driving Practice Tests

Ontario Class A Practice Tests

Ontario Class D Practice Tests

Air Brakes Practice Tests

Ontario Road Signs Test

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.