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Alabama CDL Permit Test - Combination

Number of questions: 20
Passing score: 16
Directions: All applicants who are applying for a Class A CDL should be prepared to take the Combination test. This test covers information found in Section 6 of the Commercial Driver License Manual. Section 6 provides the information needed to safely operate tractor-trailers, doubles, triples, and straight trucks with trailers. The test is made up of 20 multiple-choice questions, and applicants will have one hour to correctly answer a minimum of 16 questions. The Combination test is not a replacement for the Double/Triple endorsement test.
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Passing grade —
4 or fewer errors
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1.
Before backing your tractor under the trailer, make sure your trailer brakes are:
Disengaged.
Locked.
Deactivated.
Dry.
2.
If a trailer begins to skid, the driver should:
Lock the brakes.
Release the brakes.
Steer in the opposite direction.
Accelerate.
3.
Bobtail tractors are ____ to stop than tractors attached to full semitrailers.
Quicker
Easier
More difficult
4.
A combination vehicle has:
One air line.
Two air lines.
Three air lines.
Four air lines.
5.
When glad hands are coupled, the seals should be pressed together at a ____ angle.
50-degree
180-degree
90-degree
6.
Pull out the trailer air supply control to test:
The parking brake.
The trailer emergency brakes.
The trailer service brakes.
The landing gear.
7.
While inspecting a coupling, you should go under the trailer and:
Detach the jaws from around the kingpin.
Make sure the locking lever is in the "emergency" position.
Remove the safety latch.
Look into the back of the fifth wheel.
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