Newfoundland Commercial Drivers License Air Brakes Practice Test 1

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Newfoundland Air Brakes Practice Test 1

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

1 / 20

The full capacity of the air brake system must be available when?

At all times

In city traffic

When traveling at high speed

When going downhill

2 / 20

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

Beside the air compressor

On the vehicle dashboard

On each wheels brake

Beside the supply tank

3 / 20

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

Turn off your air brakes

Replace the line

Leave it alone, it's fine

Cover it with tape

4 / 20

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

Drum

Shoe

Lining

Rotors

5 / 20

Where are the air brake chambers located?

At each wheel

At the back wheels

Near the compressor

At the front wheels

6 / 20

What can cause the air pressure in the air brake system to drop?

All of these

Disconnected supply line

A hole in the supply line

A broken air compressor

7 / 20

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

Efficient stopping

More power than necessary

Unbalanced braking

Unbalanced weight

8 / 20

What might happen if the air lines are cross connected?

Any of these

The spring brakes won't work

The towing vehicle will lose air

The service brakes will not function correctly

9 / 20

Finding a small bit of oil during an inspection is no cause for concern if its coming from the _____________?

The second tank

Supply tank

The first tank

Wheel bearings

10 / 20

Before inspecting for air brake chamber leaks, you must __________.

Fill the compressor

Release the spring brakes and apply the service brake

Start the engine

Cover the chamber in soapy water

11 / 20

What function does the alcohol evaporator perform?

Prevents overheating

Prevents moisture build ups in the brake lines

Prevents freezing

Prevents the system from building up too much pressure

12 / 20

Which can contaminate a brake systems air lines?

Grease and oil

Dust

Dirt

Water and salt

13 / 20

The air system pressure range must be between _________.

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

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

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

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

14 / 20

Where is the brake lining fastened?

The struts

The brake shoe

The rim of the tire

The wheel well

15 / 20

The spring brake is designed for which situation?

Skids and parking

Parking and emergencies

Loading skids into the trailer

Skids and emergencies

16 / 20

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

In case anyone ever asks

Because it can be dangerous

So you're not suprised

Because you should know your truck

17 / 20

The pushrod stroke occurs when compressed air enters the?

Brake chamber

Supply tank

Engine block

Air compressor

18 / 20

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

413 kPa (60 psi)

551 kPa (80 psi)

242 kPs (35 psi)

380 kPa (55 psi)

19 / 20

To measure the time it takes to build up pressure in the air system, the engine should be idling between _______________.

800 to 1000 RPM

600 to 900 RPM

1000 to 2000 RPM

200 to 500 RPM

20 / 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

37 kPa / minute

50 kPa / minute

19 kPa / minute

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More Newfoundland Commercial Driving Practice Tests

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Newfoundland Class 4 Practice Tests

Air Brakes 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.