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

Where is the compressor mounted?

On top of the tractor

On the engine

Under the tractor

At the back of the tractor

2 / 30

What is used to ensure the compressor receives clear air?

A fan

Nothing

Water

An air filter

3 / 30

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

The slack adjuster

The brake mounting spider

The clevis

The axel housing

4 / 30

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

Loading stage

Unloading stage

Release stage

Overflow stage

5 / 30

Can compressed air be dangerous if it escapes?

Yes

Only with air-over hydraulic systems

Only with tandem trailers

6 / 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 keeps the reservoir secure in place

It opens up to allow more air to enter

None of the above

7 / 30

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

Acts as a lever

None of the above

Measures air pressure

Controls the air pressure in the brake lines

8 / 30

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

80 psi

120 psi

110 psi

40 psi

9 / 30

What is the most popular type of foundation brake called?

D-cam drum

T-cam drum

B-cam drum

S-cam drum

10 / 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

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

Rain water sometimes gets into the reservoir

11 / 30

What are reservoirs made of?

Plastic

Fibreglass

Titanium

Steel

12 / 30

What do brake shoe return springs do?

None off the above

They help to keep the park brakes secured

The pull back the brake calipers

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

13 / 30

What is the job of the governor?

To add more pressure once the maximum has been reached

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

To store air in the tanks

None of the above

14 / 30

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

40 psi

10 psi

20 psi

30 psi

15 / 30

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

Over 244° C

Over 240° C

Over 214° C

Over 204° C

16 / 30

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

100 psi

110 psi

80 psi

125 psi

17 / 30

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

It drops slightly

It remains the same

Nothing

It rises

18 / 30

What restarts the compressor?

The governor

None of the above

The engine

The driver

19 / 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

20 / 30

Once the air is compressed, where does it go?

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

It stays exactly where it is

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

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

21 / 30

What is another name for the safety valve?

The pop-off valve

The reservoir valve

The overflow valve

The pressure valve

22 / 30

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

By turning the pulleys

You can't

By pressing down on the belt midway between the pulleys

By pulling up on the belt

23 / 30

What is the compressor is usually lubricated with?

Water pressure

Hydraulic oil

Engine oil

Nothing

24 / 30

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

It causes the brake chamber to release air

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

It causes the reservoir to fill up

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

25 / 30

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

350 psi

Over 500 psi

Over 1000 psi

200 psi

26 / 30

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

Usually less than 20 psi

A minimum of 50 psi

A minimum of 40 psi

Usually less than 15 psi

27 / 30

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

Within 3 minutes at fast idle

Within 5 minutes at fast idle

Within 2 minutes at slow idle

Within 60 seconds at fast idle

28 / 30

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

240 psi

150 psi

180 psi

210 psi

29 / 30

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

A clay base mix with the water

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

Particles of the metal tank mix with the water

Grey paint from the tank mix with the water

30 / 30

How does the compressor get air?

It takes in air from the atmosphere and compresses it

It takes in air from the engine and compresses it

It takes in air from the fans and compresses it

It takes in air from the wheels and compresses it

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BC Air Brake Practice Test 02

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