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

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

The slack adjuster

The axel housing

The brake mounting spider

The clevis

2 / 30

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

None of the above

Acts as a lever

Controls the air pressure in the brake lines

Measures air pressure

3 / 30

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

Overflow stage

Release stage

Loading stage

Unloading stage

4 / 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 15 psi

Usually less than 20 psi

A minimum of 50 psi

5 / 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

120 psi

40 psi

6 / 30

What is another name for the safety valve?

The reservoir valve

The pressure valve

The overflow valve

The pop-off valve

7 / 30

What are reservoirs made of?

Titanium

Steel

Fibreglass

Plastic

8 / 30

What is the most popular type of foundation brake called?

B-cam drum

D-cam drum

S-cam drum

T-cam drum

9 / 30

What do brake shoe return springs do?

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

None off the above

They help to keep the park brakes secured

10 / 30

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

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 triple the width of the belt

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

11 / 30

Where is the compressor mounted?

Under the tractor

On top of the tractor

On the engine

At the back of the tractor

12 / 30

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

Over 1000 psi

Over 500 psi

200 psi

350 psi

13 / 30

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

It rises

It drops slightly

Nothing

It remains the same

14 / 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 supply line

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

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

15 / 30

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

110 psi

125 psi

100 psi

80 psi

16 / 30

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

150 psi

240 psi

180 psi

210 psi

17 / 30

What does a safety valve on the first reservoir do?

It opens up to allow more air to enter

It keeps the reservoir secure in place

None of the above

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

18 / 30

Can compressed air be dangerous if it escapes?

Only with air-over hydraulic systems

Only with tandem trailers

Yes

19 / 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 air pressure to be pushed through the system to apply the brakes

It causes the reservoir to fill up

20 / 30

What restarts the compressor?

None of the above

The governor

The driver

The engine

21 / 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

22 / 30

What is the compressor is usually lubricated with?

Hydraulic oil

Engine oil

Water pressure

Nothing

23 / 30

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

Over 204° C

Over 240° C

Over 244° C

Over 214° C

24 / 30

What is used to ensure the compressor receives clear air?

Nothing

Water

A fan

An air filter

25 / 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

26 / 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

27 / 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

28 / 30

How does the compressor get air?

It takes in air from the engine and compresses it

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

29 / 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

None of the above

To add more pressure once the maximum has been reached

30 / 30

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

10 psi

20 psi

40 psi

30 psi

Your score is

BC Air Brake Practice Test 02

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