Newfoundland Commercial Drivers License Air Brakes Practice Test 3

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Newfoundland Air Brakes Practice Test 3

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

1 / 20

Cut in pressure level must never fall below __________.

413 kPa (60 psi)

690 kPa (100 psi)

551 kPa (80 psi)

345 kPa (50 psi)

2 / 20

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

551 kPa (80 psi)

827 kPa (120 psi)

620 kPa (90 psi)

413 kPa (60 psi)

3 / 20

Spring brake controls are usually what color?

Yellow

Blue

Orange

Red

4 / 20

Most air brake systems will use automatic valves to?

Increase pressure at the back wheels

Reduce pressure at the front wheels

Increase pressure at the front wheels

Reduce pressure at the back wheels

5 / 20

Where are the vehicles air tanks located?

In the engine compartment

In the cab of the vehicle

Inside the wheel

Underneath around the frame

6 / 20

Activation of trailer spring brakes can be checked by?

Gunning it

Pulling the trailer air valve

Rocking the truck back and forth

Applying slight engine power

7 / 20

Why are their two service tanks?

For fuel economy

For safety

For efficiency

Incase you need more stopping power

8 / 20

How long should it take for the air pressure to rise from 587kPa to 690 kPa after the pressure had fallen below 552 kPa?

1 min

2 mins

4 mins

5 mins

9 / 20

Trailer air brake systems must apply a spring brake when the pressure drops below?

690 kPa (100 psi)

242 kPa (35 psi)

514 kPa (74 psi)

414 kPa (60 psi)

10 / 20

A vehicle should have wheel chocks or blocks securing it in place during inspection if...?

The driver leaves the cab without applying the parking brake

The driver is not within 50 m of the vehicle

Any of these apply

The driver leaves the cab under any circumstances

11 / 20

What is the service brake used for?

None of these

Normal braking

Emergency braking

Drifting

12 / 20

Which of these significantly decreases the brake force produced at the wheel?

Damp road conditions

High pressure in the compressed air tanks

Cold air temperatures

Overextension of the brake chamber pushrod

13 / 20

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

Slow down but keep driving

Call the police to let them know

Stop safely and immediately

Check it at the nearest garage

14 / 20

What is the "cut-out" level?

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

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

The safest pressure level you can turn off the truck at

The maximum speed the air brakes can stop at

15 / 20

When inspecting your brakes, you must?

All of these

Apply spring brakes

Block the truck with wheel chocks

Drive the vehicle to level ground

16 / 20

Th design of the wedge brake system allows them to?

Self lubricate

Self isolate

Self seal

Self adust

17 / 20

What does a governor do in an air brake system?

Regulates the tire pressure

Limits the speed by using automatic braking

Tells the other brakes what do to

Regulates the air pressure

18 / 20

You should be looking for this when checking your brake chambers?

New holes from wear and tear

Cracks or other damage

All of the below

Mismatched slack adjuster lengths

19 / 20

You test a tractor protection valve by removing the service line and?

Starting the truck

Switching the gears

Engaging the brake pedal

Driving 150 metres

20 / 20

Who can perform adjustments and maintenance on your air brake system?

Anyone

Only certified technicians

Your employer

You can if you are the owner

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More Newfoundland Commercial Driving Practice Tests

Newfoundland Class 1 Practice Tests

Newfoundland Class 3 Practice Tests

Newfoundland Class 4 Practice Tests

Air Brakes Practice Tests

Newfoundland 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 the provinces or any test centres. 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.