Ontario Commercial Drivers License Class A Practice Test 4

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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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Class A Ontario Practice Test 4

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

1 / 20

What does this red sign mean?

Come to a complete stop

Stop up ahead

Stop only if other vehicles approaching

Rolling stop

2 / 20

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

620 kPa (90 psi)

551 kPa (80 psi)

827 kPa (120 psi)

413 kPa (60 psi)

3 / 20

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

False

True

4 / 20

When performing a normal stop, how should you press the brake pedal?

Steady pressure at the beginning, ease as the vehicle slows

Slowly with light pressure

As hard as possible at first and then pump the brakes

Apply a little bit at a time until the vehicle stops

5 / 20

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

Fix only the minor defects

Fix what you can yourself

Note the defects in your log

Repair the defects immediately

6 / 20

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

7 hours

10 hours

3 hours

13 hours

7 / 20

When should you be ready to stop for a school bus?

During the day

In residential areas only

School hours

Anytime

8 / 20

After disconnecting from a trailer, a driver should?

Block the wheels with wheel chocks

Make sure the trailer brakes are applied

Both A and B

Lower the landing gear

9 / 20

What is a requirement on your daily log?

Driver name

Date

Odometer reading

All of these

10 / 20

How do you fix a leaky glad hand?

Tape the seal with duct tape

Lower pressure in the sytem

Swap the service and supply lines

Inspect the seal for dirt and grit and replace if necessary

11 / 20

What does this sign mean?

Swerving up ahead is dangerous

Slippery road ahead

Winding road ahead

Snakes ahead

12 / 20

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

Unbalanced weight

More power than necessary

Unbalanced braking

Efficient stopping

13 / 20

This yellow sign with the swerving car means what?

Watch for volcanic ash

Pavement is slippery when wet

Snowfall up ahead

Falling rocks near wet pavement

14 / 20

When approaching a school bus, you must stop when?

The bus is operating its alternating red lights

Only when behind the bus

If it is at a crosswalk

If there is a stop sign

15 / 20

Before driving down a grade (hill), you should?

Pick up some speed

Choose an appropriate gear

Honk your horn

Check your mirror

16 / 20

Which valves are the tractor protection system?

The trailer supply valve and the tractor protection valve

The trailer supply valve and the hand valve

The trailer supply valve and the relay emergency valve

The trailer supply valve and the foot valve

17 / 20

Don't use the differential lock when __________?

The vehicle is stopped

The wheels are spinning

Carrying a load

The wheels are different

18 / 20

Who can install and repair wheels and tires?

A doctor

Anyone

A monkey

A qualified professional

19 / 20

When inspecting your brakes, you must?

Block the truck with wheel chocks

Drive the vehicle to level ground

Apply spring brakes

All of these

20 / 20

What does this square sign mean?

Do not stop between the signs

No standing

No entry in this intersection

No stop signs in this area

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The average score is 89%

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

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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.