Air Brake Practice Test 01

Taking the free Air Brake Practice Test is an essential step towards passing your official exam with flying colors. This test is designed to assess your knowledge of air brake systems and ensure that you are well-prepared for the actual exam.

1 / 30

What can be used to gain a mechanical advantage?

A solid brake pad

Thick brake drums

Air pressure

Good tire tread

2 / 30

If the weight is doubled, the braking force must be what to be able to stop in the same distance?

The same

Quadrupled

Doubled

Tripled

3 / 30

Compressed air is used to transmit what in an air brake system?

Force

None of these

Pressure

Liquid

4 / 30

Braking systems use devices to gain a mechanical advantage with the most common device for this purpose being what?

Leverage

Fulcrum

Subservience

Pulley

5 / 30

Which statement is false? Stopping distance consists of..,

Braking distance

Brake lag

Driver's reaction time

Size of brake drums

6 / 30

Too much heat in the brakes could result in what?

Wheel lock-up

Quicker stops

Brake damage and possible failure

None of these

7 / 30

A compressor is designed to pump air into what?

Reservoir

Brake chambers

Safety valve

Quick release valve

8 / 30

Which statement is false? A basic air brake system capable of stopping a vehicle has main components, including...

Fans

A compressor to pump air with a governor to control it

A foot valve to regulate the flow of compressed air from the reservoir when it is needed for braking

A reservoir or tank to store the compressed air

9 / 30

In vehicles where the compressor is driven by belts, they should be checked for what?

Teeth

Missing

Size

Cracks and tension

10 / 30

The friction between brake drums and linings generates what?

Traction

Nothing

Heat

Noise

11 / 30

The heat produced is absorbed by what?

The wheel hubs

The metal brake drums

The brake lines

The tires

12 / 30

At what minimum psi is it not necessary for the compressor to pump air?

A minimum of 55 psi

A minimum of 80 psi

A minimum of 60 psi

A minimum of 70 psi

13 / 30

The amount of heat the brake drums can absorb depends on what?

The thickness of the metal

The age of the brakes

The length of time the brakes were applied

The make of the brake drums

14 / 30

If the speed is doubled, the braking force must be what in order to stop in the same distance?

Three times

Eight times

Four times

Six times

15 / 30

Where does the heat that the brakes generates go to?

The tires

The brake lines

The pads

The atmosphere

16 / 30

At what maximum psi is it not necessary for the compressor to pump air?

135 psi

120 psi

100 psi

110 psi

17 / 30

What is another word for the air that is squeezed into a smaller space?

Prepressed

Suppressed

Compressed

Bi-pressed

18 / 30

What is referred to as brake lag?

The time it take the brakes to stop the vehicle once the brakes have been applied

The time it takes the air to travel through a properly maintained air brake system

The time it takes the brakes to cool down after an application

The time it takes a driver to move their foot from the accelerator to the brake pedal

19 / 30

When weight and speed are both doubled, the braking force must what in order be to be able to stop in the same distance?

Increased by twelve times

Increased by three times

Increased by eight times

Increased by six times

20 / 30

The compressor is driven by what?

Air flow

A small motor

A generator

The vehicle's engine

21 / 30

Most brake linings should not exceed what temperature?

400°C

425°C

325°C

375°C

22 / 30

The time it takes from the momenta hazard is recognized to the time the brake is applied is approximately how much?

1/4 of a second

1/8 of a second

3/4 of a second

1/2 of a second

23 / 30

The distance required to stop a vehicle depends on what?

It's speed and weight

The size of the wheels

The size of the air tanks

The amount of air that applies the brakes

24 / 30

What happens if one or two of the wheels had brakes that were not properly adjusted?

The other wheels would have to do more than their share of the braking

Nothing different would happen

The brakes would lock

The vehicle would stop quicker

25 / 30

What is the source of compressed air called?

Compressor

Governor

Distributor

Generator

26 / 30

What controls the minimum and maximum air pressure in the system by controlling when the compressor pumps air?

A governor

Primary reservoir

A senator

One-way check valve

27 / 30

Most brake linings operate best at around what temperature?

350°C

150°C

290°C

250°C

28 / 30

What is meant by the unloading stage?

When the air is being discharged from the brakes

When the system pressure reaches its minimum

When the air is being pushed through the air hoses

When the system pressure reaches its maximum

29 / 30

When enough friction is created between the brake lining and the drums, what happens?

The vehicle stops quickly

The brakes work as expected

None of these

The wheels stop turning

30 / 30

If the vehicle had six wheels, each wheel would have to provide how much of the braking force?

2/6

1/12

1/6

2/3

Your score is

Air Brake Practice Test 01

About

Practice Tests

Getting a License

Get In Touch