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

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

Repair the defects immediately

Fix only the minor defects

Note the defects in your log

Fix what you can yourself

2 / 20

Read tire tread depth must be more than ______.

3mm

8mm

1.5mm

1mm

3 / 20

What does this orange sign mean?

Follow the direction of the flashing sign

Left turn only

Right turn only

Do not turn left

4 / 20

What does this yellow sign mean?

Watch for pedestrians

Pedestrians not permitted

Pedestrian pathway only, vehicles prohibited

School zone

5 / 20

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

Monthly

Annually

Semi-annually

Weekly

6 / 20

What does a driver need to transport dangerous goods?

Training

A letter

Dangerous goods

A log book

7 / 20

What does this sign mean?

Slow moving vehicle ahead

Stop sign ahead. Slow down

Yield right-of-way

Dead end street ahead

8 / 20

Cut in pressure level must never fall below __________.

551 kPa (80 psi)

690 kPa (100 psi)

413 kPa (60 psi)

345 kPa (50 psi)

9 / 20

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

True

False

10 / 20

What does this sign mean?

Park in the area between the signs

Do not park in the area between the signs

Restricted parking available

Free parking available

11 / 20

What does a governor do in an air brake system?

Tells the other brakes what do to

Regulates the air pressure

Limits the speed by using automatic braking

Regulates the tire pressure

12 / 20

If you feel sleepy while driving you should?

Sing really loud

Pull over and rest

Keep driving

Have an energy drink

13 / 20

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

Thirty

Twenty one

Seven

Fourteen

14 / 20

What information does a CVOR record contain?

Safety rating, violations, convictions, and inspections

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

Driving record, company name, number of drivers

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

15 / 20

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

All of the above

Mobile cranes

RV’s or Motor Homes

Tow vehicles

16 / 20

When inspecting your brakes, you must?

Apply spring brakes

All of these

Block the truck with wheel chocks

Drive the vehicle to level ground

17 / 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

18 / 20

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

Efficient stopping

Unbalanced braking

Unbalanced weight

More power than necessary

19 / 20

What does this rectangle sign mean?

Do not turn right

Only right turns allows

No stopping if turning right

No right turns on a red light

20 / 20

Drivers need to perform a vehicle inspection every ________.

72 hours

Week

24 hours

Month

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Your score is

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.