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?

Thick brake drums

A solid brake pad

Good tire tread

Air pressure

2 / 30

Most brake linings operate best at around what temperature?

290°C

250°C

150°C

350°C

3 / 30

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

The brakes work as expected

None of these

The vehicle stops quickly

The wheels stop turning

4 / 30

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

Tripled

Quadrupled

Doubled

The same

5 / 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 eight times

Increased by three times

Increased by six times

6 / 30

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

Teeth

Size

Cracks and tension

Missing

7 / 30

What is meant by the unloading stage?

When the system pressure reaches its minimum

When the air is being pushed through the air hoses

When the air is being discharged from the brakes

When the system pressure reaches its maximum

8 / 30

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

Fulcrum

Pulley

Leverage

Subservience

9 / 30

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

Braking distance

Brake lag

Driver's reaction time

Size of brake drums

10 / 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

11 / 30

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

Three times

Eight times

Six times

Four times

12 / 30

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

135 psi

110 psi

100 psi

120 psi

13 / 30

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

Liquid

Pressure

Force

None of these

14 / 30

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

A minimum of 55 psi

A minimum of 70 psi

A minimum of 60 psi

A minimum of 80 psi

15 / 30

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

1/8 of a second

3/4 of a second

1/2 of a second

1/4 of a second

16 / 30

The compressor is driven by what?

A small motor

A generator

Air flow

The vehicle's engine

17 / 30

The friction between brake drums and linings generates what?

Heat

Nothing

Noise

Traction

18 / 30

Where does the heat that the brakes generates go to?

The pads

The tires

The brake lines

The atmosphere

19 / 30

What is the source of compressed air called?

Compressor

Generator

Distributor

Governor

20 / 30

Too much heat in the brakes could result in what?

None of these

Wheel lock-up

Brake damage and possible failure

Quicker stops

21 / 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 a driver to move their foot from the accelerator to the brake pedal

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

22 / 30

The distance required to stop a vehicle depends on what?

The size of the air tanks

The amount of air that applies the brakes

It's speed and weight

The size of the wheels

23 / 30

The heat produced is absorbed by what?

The metal brake drums

The tires

The brake lines

The wheel hubs

24 / 30

Most brake linings should not exceed what temperature?

375°C

425°C

400°C

325°C

25 / 30

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

Nothing different would happen

The brakes would lock

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

The vehicle would stop quicker

26 / 30

A compressor is designed to pump air into what?

Brake chambers

Reservoir

Safety valve

Quick release valve

27 / 30

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

A governor

One-way check valve

Primary reservoir

A senator

28 / 30

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

2/6

1/6

1/12

2/3

29 / 30

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

The make of the brake drums

The age of the brakes

The thickness of the metal

The length of time the brakes were applied

30 / 30

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

Bi-pressed

Compressed

Suppressed

Prepressed

Your score is

Air Brake Practice Test 01

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