BC Air Brake Practice Test 02

Once you feel confident in your knowledge, take the BC air brake practice test to gauge your preparedness. This test simulates the official exam and provides you with an opportunity to practice answering questions in a timed environment. The more you practice, the better you’ll perform on the official test.

BC Air Brake Test 02

1 / 30

Most current air brake systems operate with a maximum pressure of how much psi?

80 psi

110 psi

125 psi

100 psi

2 / 30

How does the compressor get air?

It takes in air from the atmosphere and compresses it

It takes in air from the wheels and compresses it

It takes in air from the fans and compresses it

It takes in air from the engine and compresses it

3 / 30

The governor must be set to allow the compressor to resume compressing air if the air pressure drops below how much psi?

110 psi

80 psi

40 psi

120 psi

4 / 30

How quickly must the compressor be capable of building pressure in the reservoirs from 50 psi to 90 psi?

Within 60 seconds at fast idle

Within 3 minutes at fast idle

Within 2 minutes at slow idle

Within 5 minutes at fast idle

5 / 30

When air pressure is applied to the brake chamber diaphragm, what happens?

It causes the pushrod to move against the slack adjuster arm which rotates the s-cam to apply the brakes

It causes the brake chamber to release air

It causes the reservoir to fill up

It causes air pressure to be pushed through the system to apply the brakes

6 / 30

Where is the compressor mounted?

Under the tractor

On top of the tractor

At the back of the tractor

On the engine

7 / 30

Even though truck air brake system pressures are 100 psi and above, what lower air application pressure is used to make normal stops?

A minimum of 40 psi

Usually less than 20 psi

A minimum of 50 psi

Usually less than 15 psi

8 / 30

What is used to ensure the compressor receives clear air?

Nothing

An air filter

Water

A fan

9 / 30

What restarts the compressor?

The driver

None of the above

The governor

The engine

10 / 30

Safety valves are normally set to vent the excess pressure at approximately how many psi?

210 psi

150 psi

180 psi

240 psi

11 / 30

What are reservoirs made of?

Plastic

Titanium

Fibreglass

Steel

12 / 30

The slack adjuster, besides adjusting for brake wear, does what?

Measures air pressure

Acts as a lever

None of the above

Controls the air pressure in the brake lines

13 / 30

What is the job of the governor?

To add more pressure once the maximum has been reached

To store air in the tanks

None of the above

To stop compressing air once a certain air pressure has been reached

14 / 30

What happens to the temperature of the air when it's compressed?

It remains the same

It rises

Nothing

It drops slightly

15 / 30

What does a safety valve on the first reservoir do?

It protects the reservoirs from being over-pressurized and bursting if the governor fails to unload the compressor

It opens up to allow more air to enter

None of the above

It keeps the reservoir secure in place

16 / 30

What causes the water in the reservoir tank to become a grey sludge?

A small amount of oil and carbon particles and other contaminants mix with the water

Grey paint from the tank mix with the water

A clay base mix with the water

Particles of the metal tank mix with the water

17 / 30

The compressor is capable of compressing air up to how much?

Over 500 psi

200 psi

350 psi

Over 1000 psi

18 / 30

What is the temperature of the air when it leaves the compressor?

Over 240° C

Over 244° C

Over 214° C

Over 204° C

19 / 30

Once the air is compressed, where does it go?

It's pumped through an air line to the supply line

It's pumped through an air line to the foot valve

It's pumped through an air line to a supply reservoir

It stays exactly where it is

20 / 30

. When enough pressure has been built up, the governor causes the compressor to go into what stage?

Loading stage

Unloading stage

Overflow stage

Release stage

21 / 30

Why is the supply reservoir often called the wet tank?

Air that's delivered from the compressor usually contains some water vapour that condenses into liquid water

None of the above

Rain water sometimes gets into the reservoir

There is a base of water in the bottom of the tank

22 / 30

What is the most popular type of foundation brake called?

D-cam drum

B-cam drum

S-cam drum

T-cam drum

23 / 30

The range between minimum and maximum pressure should be approximately how much?

40 psi

30 psi

10 psi

20 psi

24 / 30

What is the compressor is usually lubricated with?

Engine oil

Hydraulic oil

Nothing

Water pressure

25 / 30

What do brake shoe return springs do?

They help to keep the park brakes secured

None off the above

They keep the brake linings away from the drum when the air pressure is released from the air chamber

The pull back the brake calipers

26 / 30

How do you know if the tension needs to be adjusted?

If you can press it in more than triple the width of the belt

If you can press it in more than half the width of the belt

If you can press it in more than four times the width of the belt

If you can press it in more than double the width of the belt

27 / 30

What is another name for the safety valve?

The overflow valve

The reservoir valve

The pop-off valve

The pressure valve

28 / 30

A belt, like a fan belt, drives some compressors. How do you check the belt tension?

By pulling up on the belt

By turning the pulleys

By pressing down on the belt midway between the pulleys

You can't

29 / 30

What is used to adjust the brakes to compensate for brake lining and brake drum wear?

The brake mounting spider

The clevis

The axel housing

The slack adjuster

30 / 30

Can compressed air be dangerous if it escapes?

Only with tandem trailers

Yes

Only with air-over hydraulic systems

Your score is

BC Air Brake Practice Test 02

About

Practice Tests

Getting a License

Get In Touch