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The trailer emergency brakes.
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|
|
A coupling device.
|
|
|
The anti-lock brakes.
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Maine CDL Permit Test - Combination
(From the 2020 Maine 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 need to correctly answer a minimum of 16 questions to pass. Applicants should answer at a rate of about one question per minute. The Combination test is not a replacement for the Double/Triple endorsement test.
Passing grade —
4 or fewer errors
advertising
1.
Place the trailer air supply control in its "emergency" position to test:
2.
Shut-off valves:
|
Prevent air from escaping air brake systems.
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|
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Prevent air from entering air brake systems.
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|
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Override vehicles that are out of control.
|
3.
To find out if a vehicle that was built before 1998 has an Anti-Lock Braking System (ABS), you can:
|
Pump the air brakes to activate the ABS.
|
|
|
Look into the back of the fifth wheel.
|
|
|
Check for wheel speed sensors coming from the back of the brakes.
|
4.
After completing a pre-trip inspection, you should ensure that the:
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Service line valve is closed.
|
|
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Trailer hand brake is applied.
|
|
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Emergency line valve is open.
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5.
If a trailer begins to skid, it is best for the driver to:
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Release the brakes.
|
|
|
Accelerate.
|
|
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Quickly turn the steering wheel in one direction, then in the other.
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6.
How much space should be between the upper and lower fifth wheel?
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About five inches of space
|
|
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A maximum of two inches of space
|
|
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No space
|
7.
When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.
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Level with
|
|
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Slightly higher than
|
|
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Slightly lower than
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