Newfoundland Commercial Drivers License Air Brakes Practice Test 4

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Newfoundland Air Brakes Practice Test 4

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

1 / 20

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

Drive on highways only

Follow other vehicles at a safe distance

Wear a helmet in the cab

Ride the brake pedal all the time

2 / 20

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

High pressure in the compressed air tanks

Overextension of the brake chamber pushrod

Damp road conditions

Cold air temperatures

3 / 20

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

Cracks or other damage

Mismatched slack adjuster lengths

All of the below

New holes from wear and tear

4 / 20

Cut in pressure level must never fall below __________.

345 kPa (50 psi)

551 kPa (80 psi)

413 kPa (60 psi)

690 kPa (100 psi)

5 / 20

What is the "cut in" level?

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

The maximum speed the air brakes can stop at

The safest pressure level you can turn off the truck at

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

6 / 20

A commercial vehicle with air brakes engaged must not lose air pressure faster than?

32 kPa/minute

38 kPa/minute

26 kPa/minute

21 kPa/minute

7 / 20

What is an ABS system?

Reduces stopping distance

Automatically brakes when needed

Increases braking power

Prevents wheel lock

8 / 20

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

Driving too slow

Driving the speed limit

Proper maintenance

Exceeding the vehicles weight limit

9 / 20

Where is the brake lining fastened?

The brake shoe

The wheel well

The struts

The rim of the tire

10 / 20

System air loss should be measured by applying the brake for how long?

5 minutes

1 minute

10 minutes

2 minutes

11 / 20

Which colour represent the trailer supply line?

Red

Blue

Yellow

White

12 / 20

When you are going twice the speed, your brakes will need to work ________ time harder to stop your vehicle.

Three

Four

Five

Two

13 / 20

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

242 kPs (35 psi)

380 kPa (55 psi)

551 kPa (80 psi)

413 kPa (60 psi)

14 / 20

If the outer layer of an airline is damaged, but the inner layer is ok, what should you do?

Leave it alone, it's fine

Turn off your air brakes

Replace the line

Cover it with tape

15 / 20

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

On each wheels brake

Beside the supply tank

On the vehicle dashboard

Beside the air compressor

16 / 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)

17 / 20

What is the "cut-out" level?

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

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

18 / 20

The air system pressure range must be between _________.

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

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

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

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

19 / 20

A warning system must alert the driver when the pressure drops below?

551 kPa (80 psi)

242 kPs (35 psi)

380 kPa (55 psi)

413 kPa (60 psi)

20 / 20

When can you adjust your own air brakes?

If you are certified or trained

If it is an emergency

When you are on the road

Never

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More Newfoundland Commercial Driving Practice Tests

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Newfoundland Class 3 Practice Tests

Newfoundland Class 4 Practice Tests

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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 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.