Ontario Commercial Drivers License Class D Practice Test 5

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 5

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

1 / 20

What does this construction sign mean?

Bumpy road ahead

Grooves in the pavement ahead

Pavement ends ahead

Small cars only

2 / 20

What does this yellow warning sign mean?

Fast speeds ahead

Zoo ahead

Deer crossing in this area

Wildlife reserve ahead

3 / 20

What is the gross weight of your vehicle?

Weight of the load and the vehicle

Weight of the vehicle itself

Weight of the driver

Weight of the load

4 / 20

At vehicle inspection stations, axles are inspected for?

Spacing

All of these

Brand

Condition

5 / 20

What do these signs mean if you see a construction worker holding them up?

Stop or slow down, your choice

Stop slowing down

Crossing guard signs

Stop or slow down depending on which part of the sign is facing your vehicle

6 / 20

If you are driving through snow and you see blue flashing lights up ahead, what do you do?

Speed up to pass the slow moving lights

Pull over becuase it is the police

Slow down as there is an accident up ahead

The blue lights are a snow plow, prepare to slow down behind it

7 / 20

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

12 hours

3 hours

10 hours

7 hours

8 / 20

What does this orange sign mean?

Road work begins ahead

Road is made of loose gravel

Pavement ends ahead

Military checkpoint

9 / 20

What is the "cut in" level?

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

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

10 / 20

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

413 kPa (60 psi)

551 kPa (80 psi)

380 kPa (55 psi)

242 kPs (35 psi)

11 / 20

If the outer layer of an airline is damaged, but the inner layer is ok, what should you do?

Replace the line

Turn off your air brakes

Cover it with tape

Leave it alone, it's fine

12 / 20

To measure the time it takes to build up pressure in the air system, the engine should be idling between _______________.

600 to 900 RPM

200 to 500 RPM

1000 to 2000 RPM

800 to 1000 RPM

13 / 20

What don’t a vehicle’s back wheels usually do?

Spin

Rotate

Pivot

Tricks

14 / 20

How much space should you give a cyclist when you pass them?

3 metres

1 metre

2 metres

Don't pass a cyclist

15 / 20

The low air pressure warning device needs to be replaced or adjusted if it does not trigger at a minimum level of?

413 kPa (60 psi)

242 kPs (35 psi)

380 kPa (55 psi)

551 kPa (80 psi)

16 / 20

Drivers must operate in a cycle. What are the two cycles available to drivers?

A Seven or twenty one day cycle

A seven or fourteen day cycle

A fourteen or twenty-one day cycle

A five or ten day cycle

17 / 20

Which of these vehicles would usually have an air brake system?

A compact car

A hearse

A school bus

A pickup truck

18 / 20

What does this warning sign mean?

Paved surface ends ahead

Right lane ends ahead

Hazard close to the edge of the road

Do not enter

19 / 20

What colour will the road generally look in the winter time?

None of these

Light grey with some white

Black and icy

Brown from the sand and salt

20 / 20

The tallest your vehicle can be is?

5.00 m

3.75 m

5.30 m

4.15 m

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 85%

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.