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Driving Test
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Driving Test
Mississippi
Mississippi CDL Air Brakes 2
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Q.1
Submit
What color are ABS malfunction lamps?
Orange
Yellow
Green
Blue
Q.2
Submit
The parking brake should be:
Used whenever you park your vehicle.
Used while driving.
Set when driving in bad weather.
Removed.
Q.3
Submit
Truck tractors with air brakes built on or after March 1, 1997 must have:
An Anti-Lock Braking System (ABS).
Bluetooth.
GPS.
A rear back-up camera.
Q.4
Submit
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.5
Submit
The leakage rate for a triple combination vehicle with air brakes should be no more than ____ in one minute during a static leakage test.
8 psi
5 psi
3 psi
Q.6
Submit
Truck tractors with air brakes that were built on or after March 1, 1997 are equipped with:
An extra set of brakes.
Voice-activated brakes.
Cruise control.
Anti-Lock Braking Systems (ABS).
Q.7
Submit
Braking mechanisms are located inside:
The fifth wheel.
A brake drum.
The landing gear.
Q.8
Submit
Pressing and releasing the brake pedal unnecessarily can:
Release air faster than it can be replaced.
Add more air to a brake system.
Make the brake pedal harder to depress.
Create a loud noise.
Q.9
Submit
What kind of force do emergency brakes use?
Air pressure
Mechanical
Heavy
Q.10
Submit
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.11
Submit
To make a stop in a vehicle using air brakes, the driver should:
Press down the brake pedal.
Lift the brake pedal toward them.
Push in the brake knob.
Pull out the brake knob.
Q.12
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.13
Submit
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 six months
Q.14
Submit
Air tank drains:
Allow rain water to enter air tanks.
Are used to drain water and oil from air tanks.
Should never be opened.
Must remain open while driving.
Q.15
Submit
All air tanks must include:
A drain valve.
A lock.
A trap door.
A warning sticker.
Q.16
Submit
What is removed when an air tank is drained?
Water and oil
Ammonia
Liquid cleaners
Q.17
Submit
To stop a vehicle using air brakes:
The brake pedal should be pressed.
The brake pedal should be lifted.
The brake knob should be pulled out.
The brake knob should be pushed in.
Q.18
Submit
The air compressor is connected to the:
Transmission.
Engine.
Radiator.
Q.19
Submit
If an air compressor is belt-driven, the belt should be routinely checked to ensure that it is:
Thin.
Properly tightened.
Cracked.
Q.20
Submit
During an applied leakage test, the maximum leakage rate for a double combination vehicle is ____ in a minute.
2 psi
4 psi
6 psi
Q.21
Submit
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.22
Submit
Before driving a vehicle with a dual air brake system, you must wait for the air compressor to build a minimum of ____ in both the primary and secondary systems.
25 psi
50 psi
75 psi
100 psi
Q.23
Submit
In a dual air brake system, air pressure should build from 85 to 100 psi within ____ seconds.
25
10
45
Q.24
Submit
In a vehicle with dual air brakes, what happens if one system is low on pressure?
The air from the other system will be used to supplement the system with the low pressure.
The front or rear brakes may not work properly.
All brakes will be inoperable.
The low system will use an auxiliary system to fill the tank.
Q.25
Submit
What does the air compressor governor do?
Controls when the air compressor pumps air into the air storage tanks.
Controls how quickly air leaves the air storage tanks.
Controls the temperature of the air entering the air storage tanks.
Controls the temperature of the air leaving the air storage tanks.
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