Ontario Commercial Drivers License Class D Practice Test 1

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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.

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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

What does this yellow diamond sign mean?

Narrow bridge up ahead

Sharp bend in the road

Narrow pavement up ahead

Pavement ends

2 / 20

What does this speed sign mean?

The speed limit changes up ahead

The truck weight limit

The current speed limit

The limit of cars for the bridge

3 / 20

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

Two way street

Trucks stay right

You may pass when clear

Do not pass

4 / 20

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

Air brakes

Tire treads

Over weight limits

Sleepy drivers

5 / 20

What does this sign mean?

One way street

No left turns at this intersection

No right turns at this intersection

No through traffic at this interestion

6 / 20

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

551 kPa (80 psi)

380 kPa (55 psi)

413 kPa (60 psi)

242 kPs (35 psi)

7 / 20

The maximum allowable height for a road vehicle is?

5.25 m

3.65 m

4.15 m

4.10 m

8 / 20

What does this upside down triangle sign mean?

Yield the right of way

Come to a complete stop

Slow moving vehicle

Railway crossing

9 / 20

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

6 times as much

3 times as much

2 times as much

10 times as much

10 / 20

What does a governor do in an air brake system?

Tells the other brakes what do to

Regulates the tire pressure

Limits the speed by using automatic braking

Regulates the air pressure

11 / 20

What is the best way to inspect an air compressor?

With the engine on and in high gear

With the engine on in neutral

With the engine off

With the engine on in first gear

12 / 20

Tired drivers are often compared to?

Busy drivers

Impaired drivers

Productive drivers

Good drivers

13 / 20

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

413 kPa (60 psi)

827 kPa (120 psi)

551 kPa (80 psi)

620 kPa (90 psi)

14 / 20

What does this yellow sign mean?

Children crossing

Business area up ahead

Watch for pedestrians

Playground area

15 / 20

When you license is suspended you _________.

May drive only for work

May drive during the day

Cannot drive

Must drive with a licensed driver

16 / 20

To apply for a Class D license you must be?

21 years old

Any age

16 years old

18 years old

17 / 20

What colour are the lights on a school bus arm?

Red

Yellow

Blue

Green

18 / 20

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

Never

3 Years

Year

5 Years

19 / 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 maximum speed the air brakes can stop at

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

20 / 20

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

Stop at the inspection stations for an inspection

Wait for an inspector to direct you into the station

Decide whether or not you want to stop

Only stop if you have not been inspected recently

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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.