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 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.
2.
What must be on all air tanks with air-braked vehicles?
A check valve
A lock
A trap door
3.
If a trailer begins to skid, it is best for the driver to:
Release the brakes.
Accelerate.
Quickly turn the steering wheel in one direction, then in the other.
4.
Brakes out of adjustment will:
Work properly.
Cause some of the brakes to overwork and malfunction.
Allow better acceleration.
5.
Why should you regularly drain the air tanks?
Because the air gets old and needs to be replaced
Because compressed air contains some water and the water collects in the tanks
To allow for a change in pressure
6.
Combination vehicles are usually:
Easier to drive than single commercial vehicles.
Lighter than single commercial vehicles.
More difficult to drive than single commercial vehicles.
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