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 is referred to as brake lag?

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

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

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

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

2 / 30

What is meant by the unloading stage?

When the system pressure reaches its maximum

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 minimum

3 / 30

Too much heat in the brakes could result in what?

Quicker stops

Brake damage and possible failure

Wheel lock-up

None of these

4 / 30

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

The age of the brakes

The thickness of the metal

The make of the brake drums

The length of time the brakes were applied

5 / 30

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

Nothing different would happen

The vehicle would stop quicker

The brakes would lock

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

6 / 30

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

A governor

A senator

One-way check valve

Primary reservoir

7 / 30

What is the source of compressed air called?

Compressor

Generator

Governor

Distributor

8 / 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 three times

Increased by six times

Increased by eight times

Increased by twelve times

9 / 30

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

None of these

Force

Pressure

Liquid

10 / 30

Where does the heat that the brakes generates go to?

The tires

The atmosphere

The brake lines

The pads

11 / 30

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

Suppressed

Bi-pressed

Compressed

Prepressed

12 / 30

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

Quadrupled

Doubled

Tripled

The same

13 / 30

A compressor is designed to pump air into what?

Safety valve

Reservoir

Brake chambers

Quick release valve

14 / 30

The compressor is driven by what?

The vehicle's engine

A small motor

Air flow

A generator

15 / 30

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

None of these

The vehicle stops quickly

The wheels stop turning

The brakes work as expected

16 / 30

The heat produced is absorbed by what?

The metal brake drums

The tires

The wheel hubs

The brake lines

17 / 30

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

Braking distance

Brake lag

Driver's reaction time

Size of brake drums

18 / 30

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

A minimum of 70 psi

A minimum of 60 psi

A minimum of 55 psi

A minimum of 80 psi

19 / 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

1/2 of a second

3/4 of a second

1/8 of a second

20 / 30

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

Six times

Three times

Eight times

Four times

21 / 30

Most brake linings should not exceed what temperature?

375°C

425°C

400°C

325°C

22 / 30

What can be used to gain a mechanical advantage?

Air pressure

A solid brake pad

Good tire tread

Thick brake drums

23 / 30

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

Missing

Cracks and tension

Size

Teeth

24 / 30

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

Fulcrum

Leverage

Subservience

Pulley

25 / 30

The distance required to stop a vehicle depends on what?

The size of the wheels

The amount of air that applies the brakes

The size of the air tanks

It's speed and weight

26 / 30

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

135 psi

100 psi

120 psi

110 psi

27 / 30

The friction between brake drums and linings generates what?

Heat

Nothing

Noise

Traction

28 / 30

Most brake linings operate best at around what temperature?

150°C

250°C

290°C

350°C

29 / 30

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

A compressor to pump air with a governor to control it

Fans

A reservoir or tank to store the compressed air

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

30 / 30

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

1/6

2/3

1/12

2/6

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Air Brake Practice Test 01

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