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

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

2 / 30

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

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

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

3 / 30

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

125 psi

100 psi

80 psi

110 psi

4 / 30

How does the compressor get air?

It takes in air from the wheels and compresses it

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

5 / 30

What restarts the compressor?

The governor

The engine

None of the above

The driver

6 / 30

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

Over 244° C

Over 240° C

Over 204° C

Over 214° C

7 / 30

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

20 psi

30 psi

40 psi

10 psi

8 / 30

What is another name for the safety valve?

The reservoir valve

The overflow valve

The pressure valve

The pop-off valve

9 / 30

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

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

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

10 / 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

11 / 30

Once the air is compressed, where does it go?

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

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

12 / 30

What is the most popular type of foundation brake called?

B-cam drum

S-cam drum

T-cam drum

D-cam drum

13 / 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

40 psi

120 psi

110 psi

14 / 30

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

200 psi

Over 1000 psi

Over 500 psi

350 psi

15 / 30

Can compressed air be dangerous if it escapes?

Only with tandem trailers

Yes

Only with air-over hydraulic systems

16 / 30

What does a safety valve on the first reservoir do?

It opens up to allow more air to enter

None of the above

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

17 / 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

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

Rain water sometimes gets into the reservoir

None of the above

18 / 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 60 seconds at fast idle

Within 2 minutes at slow idle

Within 5 minutes at fast idle

19 / 30

What is the job of the governor?

None of the above

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

20 / 30

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

150 psi

240 psi

180 psi

210 psi

21 / 30

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

Unloading stage

Release stage

Loading stage

Overflow stage

22 / 30

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

The slack adjuster

The clevis

The brake mounting spider

The axel housing

23 / 30

What is used to ensure the compressor receives clear air?

Water

Nothing

A fan

An air filter

24 / 30

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

Nothing

It rises

It drops slightly

It remains the same

25 / 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

26 / 30

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

None of the above

Controls the air pressure in the brake lines

Measures air pressure

Acts as a lever

27 / 30

What is the compressor is usually lubricated with?

Water pressure

Hydraulic oil

Engine oil

Nothing

28 / 30

Where is the compressor mounted?

On the engine

Under the tractor

On top of the tractor

At the back of the tractor

29 / 30

What are reservoirs made of?

Steel

Titanium

Plastic

Fibreglass

30 / 30

What do brake shoe return springs do?

The pull back the brake calipers

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

Your score is

BC Air Brake Practice Test 02

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