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Minnesota
Minnesota CDL Air Brakes 2
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Q.1
Submit
Which of the following types of vehicles is most prone to the “crack-the-whip" effect?
An automobile
A three-axle tractor
A bobtail tractor
A triple combination
Q.2
Submit
Why do large vehicles use air brakes?
Other brake systems squeak too loudly.
Air braking systems are very effective.
Air brakes are complicated.
Air is free.
Q.3
Submit
When driving while pulling trailers, you should:
Make sudden turns with the steering wheel.
Avoid making sudden moves.
Push the accelerator to the floor when starting from a stop.
Q.4
Submit
To prevent a rollover, cargo should be:
Placed near the front of a trailer.
Placed near the rear of a trailer.
Spread out on a trailer.
Loaded with most weight on the driver’s side of a trailer.
Q.5
Submit
Do not use the parking brake when parking if:
The brakes are very hot.
The brakes are very cold.
There is snow on the ground.
There is water on the ground.
Q.6
Submit
Rollovers are most likely to happen when:
Drivers turn too fast.
Driver turn too slowly.
It is windy.
It is raining.
Q.7
Submit
When a combination vehicle goes around a corner:
The vehicle must use at least two lanes.
The front and rear wheels will move in different paths.
It is best to allow the rear wheels to drive over the curb.
Q.8
Submit
All tractors and trailers must be equipped with ABS.
True
False
Q.9
Submit
When starting a vehicle with dual air brakes, pressure of ____ should be built up in the system before it is driven.
10 psi
25 psi
100 psi
200 psi
Q.10
Submit
Trailers built before 1975 are:
Required to have spring brakes.
Not required to have spring brakes.
Unsafe to drive.
Prohibited from public roadways.
Q.11
Submit
Emergency brakes are:
Not required on trucks.
Only required on trailers.
Required on tractors.
Only required when transporting hazardous materials.
Q.12
Submit
In a vehicle with dual parking control valves, once air pressure is lost and the spring brakes come on:
You will be unable to move the vehicle.
A separate air tank can be used to release the spring brakes for a short period of time.
You can use the spring brakes to continue driving normally.
The air tanks will automatically refill to a safe air pressure level.
Q.13
Submit
When glad hands are coupled, the seals should be pressed together at a ____ angle.
50-degree
180-degree
90-degree
Q.14
Submit
A shut-off valve:
Is located on the front of a trailer.
Is located on the instrument panel.
Prevents air from escaping an air brake system.
Should always be open.
Q.15
Submit
When driving a combination rig, following distance should be:
Decreased in poor weather.
Shorter than when driving a single vehicle.
About the same as when driving a single vehicle.
Longer than when driving a single vehicle.
Q.16
Submit
Before a vehicle with dual air brakes is driven, pressure of at least ____ should be built up in both braking systems.
10 psi
25 psi
50 psi
100 psi
Q.17
Submit
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.18
Submit
Brakes out of adjustment will:
Work properly.
Cause some of the brakes to overwork and malfunction.
Allow better acceleration.
Q.19
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.20
Submit
When connecting a converter dolly to a second or third trailer, the trailer height should be:
Slightly higher than the center of the fifth wheel.
Level with the center of the fifth wheel.
Slightly lower than the center of the fifth wheel.
Next to the center of the fifth wheel.
Q.21
Submit
Air tanks usually hold enough compressed air:
For one stop before needing to be refilled.
For several stops before needing to be refilled.
For a day’s worth of braking.
For an unlimited number of stops.
Q.22
Submit
During an applied leakage test, the maximum leakage rate for a double combination vehicle is:
10 psi in a minute.
8 psi in a minute.
6 psi in a minute.
4 psi in a minute.
Q.23
Submit
The air entering air storage tanks may contain:
Water and compressor oil.
Frost.
Gravel.
Antifreeze.
Q.24
Submit
What does an air compressor do in an air brake system?
It pumps air into the air storage tanks.
It fills the tires.
It moves air to the back of the truck.
Q.25
Submit
How should you test the low pressure warning signal?
Engage and disable the parking brake.
Rapidly press and release the brake pedal.
Open the rear shut-off valves.
Uncouple and recouple all glad hands.
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