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Minnesota CDL Permit Test - Air Brakes

Number of questions: 25
Passing score: 20
Directions: This endorsement is required for driving a vehicle with air brakes. To receive this endorsement, applicants must pass a written test. The test consists of 25 multiple choice questions. Each question has two, three or four possible answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Minnesota Commercial Driver’s Manual. Questions come from the chapters covering: Air Brakes and Combination Vehicles. The Air Brakes endorsement may be used with the Class A, B or C CDL.
You have made error so far
Passing grade —
5 or fewer errors
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1.
What can the “crack-the-whip” effect do?
Turn over trailers.
Make loud noises.
Make trucks accelerate.
Make trucks decelerate.
2.
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
3.
When the wheels of a trailer lock up:
The trailer will be drivable.
The trailer may swing around.
The vehicle will maintain steering.
4.
The best way to recognize that your trailer has begun to skid is by:
Seeing other drivers' faces.
Seeing it in your mirrors.
Feeling it.
Listening to the radio.
5.
Why do you need to drain air tanks regularly?
Because the air gets old and needs to be replaced
Because compressed air contains some water which must be drained from the tanks
To allow for a change in air pressure
To remove bad air from the tanks
6.
Simply changing lanes can cause:
A “crack-the-whip” effect, resulting in a rollover.
A trailer to straighten out.
Confusion over which lane the driver is hoping to use.
Other drivers to reduce their speed.
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