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

Where is the compressor mounted?

On the engine

On top of the tractor

At the back of the tractor

Under the tractor

3 / 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 2 minutes at slow idle

Within 5 minutes at fast idle

Within 3 minutes at fast idle

4 / 30

Once the air is compressed, where does it go?

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

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

5 / 30

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

40 psi

20 psi

30 psi

10 psi

6 / 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

7 / 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

8 / 30

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

Over 204° C

Over 240° C

Over 214° C

Over 244° C

9 / 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

None of the above

It opens up to allow more air to enter

It keeps the reservoir secure in place

10 / 30

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

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

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

11 / 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

A minimum of 50 psi

Usually less than 20 psi

Usually less than 15 psi

12 / 30

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

It remains the same

It drops slightly

Nothing

It rises

13 / 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 wheels and compresses it

It takes in air from the fans and compresses it

14 / 30

What is the most popular type of foundation brake called?

S-cam drum

D-cam drum

T-cam drum

B-cam drum

15 / 30

What are reservoirs made of?

Titanium

Fibreglass

Plastic

Steel

16 / 30

What do brake shoe return springs do?

None off the above

The pull back the brake calipers

They help to keep the park brakes secured

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

17 / 30

What is the compressor is usually lubricated with?

Engine oil

Hydraulic oil

Nothing

Water pressure

18 / 30

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

Over 500 psi

200 psi

350 psi

Over 1000 psi

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 four times the width of the belt

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

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

20 / 30

What is used to ensure the compressor receives clear air?

Water

Nothing

An air filter

A fan

21 / 30

Can compressed air be dangerous if it escapes?

Only with air-over hydraulic systems

Only with tandem trailers

Yes

22 / 30

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

Controls the air pressure in the brake lines

Acts as a lever

None of the above

Measures air pressure

23 / 30

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

Particles of the metal tank mix with the water

Grey paint from the tank mix with the water

A clay base mix with the water

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

24 / 30

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

210 psi

180 psi

240 psi

150 psi

25 / 30

What restarts the compressor?

None of the above

The engine

The driver

The governor

26 / 30

What is another name for the safety valve?

The pop-off valve

The reservoir valve

The pressure valve

The overflow valve

27 / 30

What is the job of the governor?

To store air in the tanks

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

To add more pressure once the maximum has been reached

None of the above

28 / 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 pulling up on the belt

By pressing down on the belt midway between the pulleys

29 / 30

Why is the supply reservoir often called the wet tank?

None of the above

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

Rain water sometimes gets into the reservoir

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

30 / 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

40 psi

80 psi

120 psi

Your score is

BC Air Brake Practice Test 02

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