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

Q.1

The ____ are activated by an electric switch that is triggered by the brake pedal.

Headlights
Turn signals
Brake lights

Q.2

Why do large vehicles use air brakes?

Other brake systems squeak too loudly.
Air brakes are very effective systems.
Other braking systems are hard to come by.

Q.3

When traveling down a steep downgrade:

The air brakes should be used.
The vehicle should be placed in a low gear and the driver should use engine braking.
The driver should continually downshift instead of using the brakes.

Q.4

Air tank drains should:

Not be used by the driver.
Only be used when it is wet outside.
Be used to drain the tanks completely.

Q.5

Emergency brakes:

Are not required on vehicles with air brakes.
Are required only on buses.
Are required on all vehicles.

Q.6

You should ____ if the low pressure warning signal activates while you are driving.

Stop where you are and park
Exit the roadway as soon as safely possible
Continue driving normally

Q.7

Which of the following is not part of a vehicle’s air brake system?

Air gauges
Low pressure warning device
Air filter

Q.8

Braking mechanisms are located inside:

The fifth wheel.
A brake drum.
The landing gear.

Q.9

If the safety relief valve in an air brake system is releasing air:

You should not be concerned as this is a normal process.
There is something wrong with the brakes.
The valve is operational.

Q.10

Air storage tanks:

Are not allowed on a vehicle.
Hold compressed air for the brakes.
Should be drained of excess air after every trip.

Q.11

Air tank drains should:

Only be used by mechanics.
Only be used when it is wet outside.
Be used to drain the tanks completely.

Q.12

Using the brakes creates heat. If too much heat is produced:

The brakes may not work.
The brakes may squeak more than usual.
The brakes will brake unevenly.

Q.13

Truck tractors with air brakes built on or after March 1, 1997 must have:

An Anti-Lock Braking System (ABS).
Bluetooth.
A GPS.

Q.14

Air brakes use ____ to function.

Compressed air
Liquid nitrogen
Carbon dioxide

Q.15

A low air pressure warning signal:

Is not required on vehicles with air brakes.
Is required on vehicles with air brakes.
Is optional on vehicles with air brakes.

Q.16

During an applied leakage test, the maximum leakage rate for a triple combination vehicle is ____ in a minute.

2 psi
4 psi
6 psi

Q.17

Why should you regularly drain the air tanks?

Because the air gets old and needs to be replaced
Because compressed air contains some water and the water collects in the tanks
To allow for a change in pressure

Q.18

Once the air tanks are at an air pressure level of 125 psi, the air compressor governor will:

Stop the compressor from pumping air.
Release air from the tanks.
Begin pumping air into the tanks.

Q.19

Failing to drain air tanks could result in:

Water accumulations freezing and causing brake failure.
Squishy brakes.
Too much air collecting in the tanks.

Q.20

What does the air compressor governor do?

It stops the compressor from pumping air.
It turns on the air compressor.
It stores the compressed air.

Q.21

If the spring brakes are on, you should:

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

Q.22

When stopping in an emergency situation, you should:

Veer your trailer to the right and stop.
Stop in a straight line.
Veer your trailer to the left and stop.

Q.23

When parked on a flat surface, you should:

Use wheel chocks to prevent your vehicle from moving.
Not use wheel chocks.
Use wheel chocks, but only if you have applied the parking brake.

Q.24

During a static leakage test, what is the maximum leakage rate that is safe for a double combination vehicle?

3 psi in one minute.
6 psi in one minute.
8 psi in one minute.

Q.25

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

0 h : 0 m : 1 s