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Virginia
Virginia CDL Air Brakes 1
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Q.1
Submit
The air compressor is connected to the:
Transmission.
Engine.
Radiator.
Q.2
Submit
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.3
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.4
Submit
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.5
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.6
Submit
Do not operate a vehicle if any brake drums have cracks that are larger than ____ of the width of the friction area.
One half
One third
One fifth
Q.7
Submit
Before driving a vehicle with air brakes, you should ensure that the ____ come on automatically when air pressure falls below 45 psi.
Spring brakes
Parking brakes
Air brakes
Q.8
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.9
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.10
Submit
Some water and compressor oil is usually found in the compressed air within an air brake system. The water and compressor oil:
Are necessary for the proper function of the system.
Should take up about 10 percent of the tank.
Should be removed regularly.
Q.11
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.
Q.12
Submit
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.13
Submit
What tells you how much pressure is in your vehicle's air tanks?
The supply pressure gauge
The ABS malfunction lamp
The tractor protection valve
Q.14
Submit
What is often found in compressed air?
Water
Cardboard
Brake fluid
Q.15
Submit
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.16
Submit
Truck tractors with air brakes built on or after March 1, 1997 must have:
An Anti-Lock Braking System (ABS).
Bluetooth.
A GPS.
Q.17
Submit
While operating on a downgrade, you should brake until you reach a speed that is:
5 mph below your safe speed.
10 mph below your safe speed.
15 mph below your safe speed.
Q.18
Submit
If the spring brakes are on, you should:
Not use the brake pedal.
Press the accelerator.
Move the steering wheel.
Q.19
Submit
Manual air tank drains should be:
Opened to drain the tanks after each day.
Left open while driving.
Sealed with glue.
Q.20
Submit
When parking, you should not use the parking brake if:
The brakes are very hot.
The brakes are very cold.
There is snow on the ground.
Q.21
Submit
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.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
A slack adjuster should move no more than ____ from where it is attached to the push rod.
Two inches
Five inches
One inch
Q.24
Submit
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.25
Submit
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.
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