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

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

Because it can be dangerous

Because you should know your truck

In case anyone ever asks

So you're not suprised

2 / 20

What function does the alcohol evaporator perform?

Prevents overheating

Prevents freezing

Prevents the system from building up too much pressure

Prevents moisture build ups in the brake lines

3 / 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)

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

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

4 / 20

The pushrod stroke occurs when compressed air enters the?

Brake chamber

Supply tank

Engine block

Air compressor

5 / 20

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

Efficient stopping

Unbalanced weight

Unbalanced braking

More power than necessary

6 / 20

Which can contaminate a brake systems air lines?

Grease and oil

Water and salt

Dirt

Dust

7 / 20

Where is the brake lining fastened?

The wheel well

The rim of the tire

The brake shoe

The struts

8 / 20

Where are the air brake chambers located?

At the back wheels

Near the compressor

At each wheel

At the front wheels

9 / 20

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

Beside the air compressor

Beside the supply tank

On the vehicle dashboard

On each wheels brake

10 / 20

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

200 to 500 RPM

600 to 900 RPM

1000 to 2000 RPM

800 to 1000 RPM

11 / 20

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

Wheel bearings

The first tank

Supply tank

The second tank

12 / 20

The spring brake is designed for which situation?

Skids and emergencies

Skids and parking

Loading skids into the trailer

Parking and emergencies

13 / 20

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

37 kPa / minute

21 kPa / minute

50 kPa / minute

19 kPa / minute

14 / 20

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

A broken air compressor

Disconnected supply line

All of these

A hole in the supply line

15 / 20

What might happen if the air lines are cross connected?

The towing vehicle will lose air

Any of these

The service brakes will not function correctly

The spring brakes won't work

16 / 20

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

When going downhill

At all times

When traveling at high speed

In city traffic

17 / 20

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

242 kPs (35 psi)

551 kPa (80 psi)

380 kPa (55 psi)

413 kPa (60 psi)

18 / 20

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

Shoe

Lining

Rotors

Drum

19 / 20

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

Release the spring brakes and apply the service brake

Fill the compressor

Start the engine

Cover the chamber in soapy water

20 / 20

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

Cover it with tape

Turn off your air brakes

Replace the line

Leave it alone, it's fine

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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.