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Driving Test
Washington
Washington CDL Air Brakes 2
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Q.1
Submit
When the spring brakes are on, you should never:
Turn on the lights.
Turn off the vehicle.
Push down the brake pedal.
Q.2
Submit
A slack adjuster should move no more than ____ from where it is attached to the push rod.
Two inches
Five inches
One inch
Q.3
Submit
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
Submit
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.5
Submit
While driving, ____ generally holds spring brakes in place.
Air pressure
Electricity
Gasoline
Q.6
Submit
What kind of force do emergency brakes use?
Air pressure
Mechanical
Heavy
Q.7
Submit
During an inspection, slack adjusters on S-cam brakes should not move more than:
One foot.
One centimeter.
One inch.
Q.8
Submit
In a dual air brake system, air pressure should build from 85 to 100 psi within ____ seconds.
25
10
45
Q.9
Submit
If the low air pressure warning signal comes on in a vehicle with air brakes, the driver should:
Test the brakes while driving, but continue driving if nothing seems wrong.
Immediately stop driving.
Drive with the hazard lights activated.
Q.10
Submit
The ____ between an air compressor and reservoir tank prevents air from escaping if the air compressor has a leak.
Slack adjuster
One-way check valve
Tractor protection valve
Q.11
Submit
What is often found in compressed air?
Water
Cardboard
Brake fluid
Q.12
Submit
____ make up the emergency brake system.
Only parts of the parking brake system
Only parts of the service brake system
Parts of the parking and service brake systems
Q.13
Submit
When an S-cam turns inside a brake drum, the S-cam:
Presses the brake shoes against the inside of the brake drum.
Presses the brake shoes against the brake linings.
Presses the brake linings against the wheel axles.
Q.14
Submit
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.15
Submit
If the spring brakes are on, you should:
Not use the brake pedal.
Press the accelerator.
Move the steering wheel.
Q.16
Submit
In a vehicle with dual parking control valves, a separate air tank can be used:
To make the air brakes work more effectively.
To temporarily release the spring brakes.
To charge the brakes on the rear trailer.
Q.17
Submit
An air compressor governor controls:
When the air compressor pumps air into the air storage tanks.
How fast air is pumped into the air storage tanks.
The temperature of the air pumped into the air storage tanks.
Q.18
Submit
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.19
Submit
Brakes can get out of adjustment quickly, especially:
If they are hot.
In the winter time.
If they are used frequently.
Q.20
Submit
Braking mechanisms are located inside:
The fifth wheel.
A brake drum.
The landing gear.
Q.21
Submit
An alcohol evaporator in an air brake system:
Makes the brakes work without squeaking.
Prevents ice from forming in the braking system.
Lubricates parts of the braking system.
Q.22
Submit
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.23
Submit
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.24
Submit
Which of the following is not part of a vehicle’s air brake system?
Air gauges
Low pressure warning device
Air filter
Q.25
Submit
The parking brake in a newer vehicle is applied by:
Moving a lever to the right.
Pushing a yellow, diamond-shaped knob.
Pulling a yellow, diamond-shaped knob.
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