Ontario Commercial Drivers License Class D Practice Test 3

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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.

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Commercial Driver HQ

Ontario Class D Practice Test 3

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

1 / 20

What should you do when the air brakes low pressure warning comes on?

Stop safely and immediately

Slow down but keep driving

Check it at the nearest garage

Call the police to let them know

2 / 20

Which of these vehicle driver’s are exempt from the Hours of Service Regulations?

RV’s or Motor Homes

Mobile cranes

Tow vehicles

All of the above

3 / 20

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

Fix what you can yourself

Note the defects in your log

Fix only the minor defects

Repair the defects immediately

4 / 20

Cut in pressure level must never fall below __________.

690 kPa (100 psi)

551 kPa (80 psi)

413 kPa (60 psi)

345 kPa (50 psi)

5 / 20

Drivers need to perform a vehicle inspection every ________.

Month

Week

24 hours

72 hours

6 / 20

What does this rectangle sign mean?

Do not turn right

No right turns on a red light

Only right turns allows

No stopping if turning right

7 / 20

What information does a CVOR record contain?

Driving record, criminal records, education levels, social insurance number

Safety training records for each driver, list of goods carried, name of CEO

Driving record, company name, number of drivers

Safety rating, violations, convictions, and inspections

8 / 20

As an operator you are required to have vehicles and trailers inspected how often?

Weekly

Semi-annually

Annually

Monthly

9 / 20

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

False

True

10 / 20

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

More power than necessary

Unbalanced braking

Efficient stopping

Unbalanced weight

11 / 20

Read tire tread depth must be more than ______.

8mm

1.5mm

3mm

1mm

12 / 20

What does a governor do in an air brake system?

Regulates the tire pressure

Limits the speed by using automatic braking

Regulates the air pressure

Tells the other brakes what do to

13 / 20

If you feel sleepy while driving you should?

Pull over and rest

Sing really loud

Keep driving

Have an energy drink

14 / 20

What does a driver need to transport dangerous goods?

Dangerous goods

A log book

A letter

Training

15 / 20

What does this yellow sign mean?

Pedestrian pathway only, vehicles prohibited

Pedestrians not permitted

School zone

Watch for pedestrians

16 / 20

How many previous days must a drivers log keep track of?

Thirty

Seven

Twenty one

Fourteen

17 / 20

What does this sign mean?

Free parking available

Do not park in the area between the signs

Park in the area between the signs

Restricted parking available

18 / 20

What does this orange sign mean?

Left turn only

Right turn only

Follow the direction of the flashing sign

Do not turn left

19 / 20

When inspecting your brakes, you must?

All of these

Drive the vehicle to level ground

Block the truck with wheel chocks

Apply spring brakes

20 / 20

What does this sign mean?

Yield right-of-way

Stop sign ahead. Slow down

Dead end street ahead

Slow moving vehicle ahead

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The average score is 89%

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.