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Relay
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Supply
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Emergency
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Alabama CDL Permit Test - Combination
(From the 2021 Alabama CDL driver handbook)
| 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.
Passing grade —
4 or fewer errors
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1.
The service air line is often controlled by the foot brake and is attached to the ____ valves.
2.
While inspecting a coupling, you should go under the trailer and:
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Detach the jaws from around the kingpin.
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Make sure the locking lever is in the "emergency" position.
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Remove the safety latch.
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Look into the back of the fifth wheel.
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3.
When coupling, after you've connected the air lines to the trailer, you should:
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Supply air to the trailer.
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Activate the emergency brake.
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Disconnect the glad hands.
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4.
In a sudden turn, the ____ trailer is the most likely to turn over.
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Front
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Last
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Middle
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First
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5.
In a double or triple combination, the ____ trailer should be directly behind the cab.
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Lightest
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Heaviest
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Smallest
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6.
Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:
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The trailer will stop normally.
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The trailer will not have brakes.
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The trailer will speed up.
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7.
A loss of air pressure in the emergency line will cause:
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The suspension springs to extend.
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The tractor protection valve to open.
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The rear trailer to detach from the combination.
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The emergency brakes to activate.
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