Alabama CDL Air Brakes 1 - DMV Written Test Questions with Answers - MCQGeeks.com

Q.1

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.2

In cold weather, an alcohol evaporator should be checked and filled:

Once a week.
Every day.
Every hour.
Once a month.

Q.3

The service brake system:

Applies and releases the brakes when you press the brake pedal while driving normally.
Applies and releases the parking brakes.
Applies and releases the emergency brake.
Applies and releases the axle brake.

Q.4

When leaving a vehicle unattended, a driver should:

Always set the parking brake.
Only set the parking brake if the vehicle is parked on a slope.
Deflate the tires by 10 percent.

Q.5

Friction inside a brake drum is caused when the brake shoes and linings:

Push against each other.
Separate from the axle.
Push against the inside of the drum.
Create excess heat.

Q.6

If the spring brakes are activated, you should never:

Push down the brake pedal.
Open the hood.
Release air from the air storage tanks.
Open the door to the cab.

Q.7

An application pressure gauge shows:

How much air pressure is being applied to the brakes.
How much air pressure is available.
How much air pressure is required to stop a vehicle.

Q.8

A slack adjuster should move no more than ____ from where it is attached to the push rod.

Two inches
Five inches
One inch

Q.9

The air storage tanks:

Hold only enough air for one braking cycle.
Hold enough air for the brakes to be used several times if the compressor stops working.
Do not hold air unless there is an emergency.

Q.10

When leaving your vehicle unattended:

The parking brake should be used.
The parking brake only needs to be used if the vehicle is parked on a slope.
The parking brake should not be used, as it can damage the tires.

Q.11

In a dual air brake system, air pressure should build from 85 to 100 psi within ____ seconds.

25
10
45

Q.12

When traveling down a steep downgrade, the best way to use your brakes is to:

Ride the brakes all the way down the hill.
Apply the brakes for a few seconds, then release the brakes for a few seconds. Continue to repeat these steps as you travel down the hill.
Apply the brakes only near the bottom of the downgrade.
Apply consistent pressure to the brake pedal all the way down the hill.

Q.13

Some air brake systems introduce alcohol into the system to:

Make the brakes work without squeaking.
Prevent ice from forming in the brake system.
Prevent people from breathing the air from the system.

Q.14

What is removed when an air tank is drained?

Water and oil
Ammonia
Liquid cleaners

Q.15

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.16

What color are ABS malfunction lamps?

Orange
Yellow
Green
Blue

Q.17

Where is the safety relief valve usually located?

Near the rear brake
Near the front brake
In an air tank
On the dashboard

Q.18

The most common type of foundation brake used is the:

S-cam drum brake.
C-cam drum brake.
G-cam disc brake.
P-cam disc brake.

Q.19

Anti-Lock Braking Systems (ABS):

Reduce normal braking capacity.
Are equipped in addition to other braking systems and do not reduce normal braking power.
Are not effective on larger vehicles.
Are illegal in some states.

Q.20

How much distance will an air brake-equipped vehicle need to come to a complete stop if it is traveling at 55 mph under ideal driving conditions?

300 feet
100 feet
450 feet

Q.21

If the spring brakes are on, you should:

Not use the brake pedal.
Press the accelerator.
Move the steering wheel.

Q.22

Vehicles equipped with Anti-Lock Braking Systems (ABS) have ____ malfunction lamps to indicate when the ABS is not working.

Green
Blue
Yellow

Q.23

When a brake pedal is pressed and the S-cam is turned, the S-cam:

Presses the brake shoes against the inside of the brake drum.
Tightens the brake drum onto the axle.
Presses the brake lining against the wheel.
Releases air from the air tanks.

Q.24

Both systems in a dual air brake systems share:

Air tanks.
Hoses.
Air lines.
An air compressor.

Q.25

Anti-Lock Braking Systems (ABS):

Reduce a vehicle's normal braking capacity.
Are in addition to other braking systems and do not reduce a vehicle's braking power.
Are not effective on larger vehicles.

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