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

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

Stop safely and immediately

Slow down but keep driving

Call the police to let them know

Check it at the nearest garage

2 / 20

Cut in pressure level must never fall below __________.

551 kPa (80 psi)

413 kPa (60 psi)

345 kPa (50 psi)

690 kPa (100 psi)

3 / 20

Activation of trailer spring brakes can be checked by?

Applying slight engine power

Rocking the truck back and forth

Gunning it

Pulling the trailer air valve

4 / 20

Why are their two service tanks?

For safety

For fuel economy

For efficiency

Incase you need more stopping power

5 / 20

Where are the vehicles air tanks located?

In the engine compartment

In the cab of the vehicle

Underneath around the frame

Inside the wheel

6 / 20

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

New holes from wear and tear

All of the below

Mismatched slack adjuster lengths

Cracks or other damage

7 / 20

What is the "cut-out" level?

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

The safest pressure level you can turn off the truck at

8 / 20

Spring brake controls are usually what color?

Blue

Red

Orange

Yellow

9 / 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

10 / 20

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

The driver leaves the cab under any circumstances

The driver is not within 50 m of the vehicle

Any of these apply

The driver leaves the cab without applying the parking brake

11 / 20

Th design of the wedge brake system allows them to?

Self seal

Self lubricate

Self adust

Self isolate

12 / 20

Most air brake systems will use automatic valves to?

Reduce pressure at the back wheels

Reduce pressure at the front wheels

Increase pressure at the front wheels

Increase pressure at the back wheels

13 / 20

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

413 kPa (60 psi)

551 kPa (80 psi)

620 kPa (90 psi)

827 kPa (120 psi)

14 / 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

15 / 20

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

414 kPa (60 psi)

514 kPa (74 psi)

242 kPa (35 psi)

690 kPa (100 psi)

16 / 20

When inspecting your brakes, you must?

Drive the vehicle to level ground

Block the truck with wheel chocks

All of these

Apply spring brakes

17 / 20

What is the service brake used for?

Emergency braking

Normal braking

None of these

Drifting

18 / 20

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

Starting the truck

Driving 150 metres

Engaging the brake pedal

Switching the gears

19 / 20

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

High pressure in the compressed air tanks

Damp road conditions

Overextension of the brake chamber pushrod

Cold air temperatures

20 / 20

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

Only certified technicians

Anyone

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.