Ontario Commercial Drivers License Air Brakes Practice Test 2

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Ontario Air Brakes Practice Test 2

A 20 question practice test to help prepare you for your air brakes knowledge test in Ontario

1 / 20

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

413 kPa (60 psi)

380 kPa (55 psi)

551 kPa (80 psi)

242 kPs (35 psi)

2 / 20

Which can contaminate a brake systems air lines?

Dust

Dirt

Grease and oil

Water and salt

3 / 20

When inspecting an air brake system, the person inspecting should wear?

Shorts and Crocs

Sandals and shorts

Steel toe boots, safety glasses, hard hats

Dust mask, safety glasses

4 / 20

The best way to reduce rough and abrupt braking is to?

Follow other vehicles at a safe distance

Drive on highways only

Ride the brake pedal all the time

Wear a helmet in the cab

5 / 20

Why is it important to know where your air system releases air pressure from?

Because you should know your truck

In case anyone ever asks

So you're not suprised

Because it can be dangerous

6 / 20

What does a governor do in an air brake system?

Limits the speed by using automatic braking

Regulates the tire pressure

Tells the other brakes what do to

Regulates the air pressure

7 / 20

What powers the air brakes air compressor system?

The rotation of the wheels

The battery

The trucks engine

Overhead wires

8 / 20

What is the service brake used for?

None of these

Emergency braking

Drifting

Normal braking

9 / 20

Doing this will put unnecessary strain on your vehicles braking system.

Driving the speed limit

Exceeding the vehicles weight limit

Driving too slow

Proper maintenance

10 / 20

The spring brake is designed for which situation?

Skids and emergencies

Parking and emergencies

Skids and parking

Loading skids into the trailer

11 / 20

The air system pressure range must be between _________.

413 kPa (60 psi) and 828 kPa (120 psi)

690 kPa (100 psi) and 1380 kPa (200 psi)

483 kPa (70 psi) and 1138 kPa (165 psi)

551 kPa (80 psi) and 1000 kPa (145 psi)

12 / 20

Any commercial vehicle with air brakes must not lose system pressure with the brakes applied at a rate of more than?

21 kPa / minute

50 kPa / minute

37 kPa / minute

19 kPa / minute

13 / 20

What is the "cut-out" level?

The safest pressure level you can turn off the truck at

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

The maximum speed the air brakes can stop at

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

14 / 20

Where is the air pressure gauge for the air brake system?

On the vehicle dashboard

Beside the air compressor

On each wheels brake

Beside the supply tank

15 / 20

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

A compact car

A pickup truck

A hearse

A school bus

16 / 20

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

Stop safely and immediately

Check it at the nearest garage

Call the police to let them know

Slow down but keep driving

17 / 20

Manufactures recommend draining moisture and oil in an air system on a _______ basis.

Monthly

Quarterly

Daily

Weekly

18 / 20

What happens to the air valve when you press down the brake?

The air valve is operated by the gas pedal

The air valve opens letting more air into the brakes

The air valve closes, leaving the brake pressure the same

The air valve signals the compressor to turn on

19 / 20

Most air brake systems will use automatic valves to?

Increase pressure at the front wheels

Reduce pressure at the back wheels

Reduce pressure at the front wheels

Increase pressure at the back wheels

20 / 20

Which of these is not part of an air brake system?

Rotors

Lining

Shoe

Drum

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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.