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

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

2 / 30

What is the job of the governor?

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

None of the above

To add more pressure once the maximum has been reached

To store air in the tanks

3 / 30

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

By turning the pulleys

By pressing down on the belt midway between the pulleys

By pulling up on the belt

You can't

4 / 30

Once the air is compressed, where does it go?

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

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

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

It stays exactly where it is

5 / 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 keeps the reservoir secure in place

It opens up to allow more air to enter

6 / 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 double 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

7 / 30

What restarts the compressor?

The driver

The governor

None of the above

The engine

8 / 30

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

80 psi

100 psi

110 psi

125 psi

9 / 30

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

It causes the reservoir to fill up

It causes the brake chamber to release air

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

10 / 30

What is the most popular type of foundation brake called?

D-cam drum

B-cam drum

S-cam drum

T-cam drum

11 / 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

110 psi

40 psi

120 psi

12 / 30

What do brake shoe return springs do?

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

None off the above

They help to keep the park brakes secured

13 / 30

Can compressed air be dangerous if it escapes?

Only with tandem trailers

Only with air-over hydraulic systems

Yes

14 / 30

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

Release stage

Loading stage

Overflow stage

Unloading stage

15 / 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

Grey paint from the tank mix with the water

Particles of the metal tank mix with the water

16 / 30

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

Measures air pressure

None of the above

Controls the air pressure in the brake lines

Acts as a lever

17 / 30

What are reservoirs made of?

Steel

Fibreglass

Plastic

Titanium

18 / 30

Where is the compressor mounted?

On top of the tractor

On the engine

Under the tractor

At the back of the tractor

19 / 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

20 / 30

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

Over 1000 psi

200 psi

350 psi

Over 500 psi

21 / 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

Usually less than 15 psi

A minimum of 50 psi

22 / 30

What is the compressor is usually lubricated with?

Water pressure

Hydraulic oil

Engine oil

Nothing

23 / 30

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

240 psi

150 psi

180 psi

210 psi

24 / 30

What is another name for the safety valve?

The pressure valve

The pop-off valve

The reservoir valve

The overflow valve

25 / 30

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

20 psi

40 psi

30 psi

10 psi

26 / 30

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

Over 214° C

Over 204° C

Over 244° C

Over 240° C

27 / 30

What is used to ensure the compressor receives clear air?

Nothing

Water

An air filter

A fan

28 / 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

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

Rain water sometimes gets into the reservoir

29 / 30

How does the compressor get air?

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

It takes in air from the atmosphere and compresses it

30 / 30

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

It remains the same

Nothing

It drops slightly

It rises

Your score is

BC Air Brake Practice Test 02

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