|
The trailer will stop normally.
|
|
|
The trailer will not have brakes.
|
|
|
The trailer will speed up.
|
Alabama CDL Permit Test - Combination
(From the 2020 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.
Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:
2.
The service air line is often controlled by the foot brake and is attached to the ____ valves.
|
Relay
|
|
|
Supply
|
|
|
Emergency
|
3.
In a sudden turn, the ____ trailer is the most likely to turn over.
|
Front
|
|
|
Last
|
|
|
Middle
|
|
|
First
|
4.
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.
|
5.
In a double or triple combination, the ____ trailer should be directly behind the cab.
|
Lightest
|
|
|
Heaviest
|
|
|
Smallest
|
6.
When coupling, after you've connected the air lines to the trailer, you should:
|
Supply air to the trailer.
|
|
|
Activate the emergency brake.
|
|
|
Disconnect the glad hands.
|
7.
A loss of air pressure in the emergency line will cause:
|
The suspension springs to extend.
|
|
|
The tractor protection valve to open.
|
|
|
The rear trailer to detach from the combination.
|
|
|
The emergency brakes to activate.
|
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