A tube used to move air from the compressor to the tanks

A noise made by air brakes when used

A part within the braking unit that allows air to move freely

Are used to drain water and oil from an air tank.

Allow rain water to enter an air tank.

Must remain open during driving.

West Virginia CDL Air Brakes 2 - DMV Written Test Questions with Answers

Q.1

Failing to drain the tanks in an air brake system can result in:

Water freezing and causing brake failure.
Squishy brakes.
Too much air collecting.
Too much fuel being carried.

Q.2

To confirm that a trailer has ABS, you can:

Look under the trailer for wheel speed sensors coming from the back of the brakes.
Look under the hood for the ABS sticker.
Look at the tires.
Remove a tire and look for the ABS sensor on the axle.

Q.3

If the low pressure warning light comes on while you are driving:

Braking will only occur if there is enough air in the tanks.
You can brake 14 times before the air in the system runs out.
You should continue to drive normally and check the brake system when it is convenient.
You should continue driving, but turn the emergency flashers on to warn other motorists.

Q.4

The brake pedal is part of which braking system?

The service brake system
The parking brake system
The emergency brake system
The auxiliary brake system

Q.5

In a dual air brake system, a leak in one system:

Always means there are leaks in both systems.
May not affect the other system.
Is not something to worry about.
Will also affect the other system.

Q.6

On newer vehicles, how do you put on the parking brake?

Move a lever to the right.
Push in the yellow, diamond-shaped knob.
Pull out the yellow, diamond-shaped knob.
Pull up on the steering column.

Q.7

When starting a vehicle with dual air brakes, pressure of ____ should be built up in the system before it is driven.

10 psi
25 psi
100 psi
200 psi

Q.8

If braking at a speed of 55 mph while driving on dry pavement, the brake lag can add ____ to your vehicle's total stopping distance.

32 feet
15 feet
50 feet
10 feet

Q.9

When you press the brake pedal in a vehicle with S-cam brakes, air pressure pushes out the rod and moves the:

Slack adjuster.
Axle.
Brake drum.
Alcohol evaporator.

Q.10

To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:

Set the control to normal.
Set the control to the off position.
Set the control to neutral.
Keep the control at the halfway mark.

Q.11

In a dual air brake system:

Air tanks are shared by both systems.
Each system has its own air tanks.
You must designate which system you are using.
Brakes on only one side of the vehicle will work.

Q.12

If the air pressure warning light comes on, you should:

Continue to drive normally.
Drive with one foot on the accelerator and one foot on the brake pedal.
Call the local law enforcement agency.
Safely exit the roadway and stop.

Q.13

A low air pressure warning signal should activate:

When tank pressure falls below 120 psi.
When tank pressure falls below 60 psi.
When tank pressure falls below 10 psi.

Q.14

When you need to stop in an emergency, you should:

Lock the wheels and skid to a stop.
Stop in a way that keeps your vehicle in a straight line.
Stop in a way that turns your vehicle.
Expect your vehicle to slow down more quickly than usual.

Q.15

The ____ tells a driver how much pressure is in the air tanks.

Application pressure gauge
Air compressor governor
Supply pressure gauge
Drum brake

Q.16

To use the controlled braking method, you should:

Apply the brakes as hard as possible without locking the wheels.
Apply the brakes with about half-force.
Apply the brakes until the wheels lock.
Pump the brakes.

Q.17

When only the tractor is equipped with an Anti-Lock Braking System (ABS):

There is a decreased risk of jackknifing.
There is an increased risk of jackknifing.
The brakes will not work as effectively as they would without ABS.
The brakes will become more sensitive.

Q.18

What is a wig wag?

A type of warning system
A tube used to move air from the compressor to the tanks
A noise made by air brakes when used
A part within the braking unit that allows air to move freely

Q.19

If the brake pads rub against the brake drums and create too much heat:

The brakes will stick.
The brakes will become extra sensitive.
The brakes may stop working.
The air compressor will kick on to cool the brakes.

Q.20

Emergency brakes:

Are not required on trucks.
Are only required on trailers.
Are required on tractors.
Are optional.

Q.21

If using air tanks with manually operated drains, how often should you drain the tanks?

Every day
Once a week
Once a month
Once every 3,000 miles

Q.22

During a static leakage test, the maximum leakage rate for a triple combination vehicle with air brakes is ____ in a minute.

3 psi
5 psi
7 psi
9 psi

Q.23

Air tank drains:

Allow rain water to enter an air tank.
Are used to drain water and oil from an air tank.
Should never be opened.
Must remain open during driving.

Q.24

The parking brake should be:

Used whenever you park the vehicle.
Used while driving.
Set when driving in bad weather.
Used to stop the vehicle in normal driving.

Q.25

Most heavy-duty vehicles use:

Mono air brake systems.
Dual air brake systems.
Triple air brake systems.
Quadruple air brake systems.