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Maine 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 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.
You have made error so far
Passing grade —
4 or fewer errors
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1.
Place the trailer air supply control in its "emergency" position to test:
The trailer emergency brakes.
A coupling device.
The anti-lock brakes.
2.
Shut-off valves:
Prevent air from escaping air brake systems.
Prevent air from entering air brake systems.
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:
Service line valve is closed.
Trailer hand brake is applied.
Emergency line valve is open.
5.
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.
6.
How much space should be between the upper and lower fifth wheel?
About five inches of space
A maximum of two inches of space
No space
7.
When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.
Level with
Slightly higher than
Slightly lower than
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