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South Carolina CDL Practice Test: Double and Triples - Test 4 2020

(From the 2020 South Carolina CDL Handbook)
Number of tests: 27
Number of questions: 30
Passing score: 80

Directions: To obtain this endorsement for pulling two or three trailers, applicants must pass a 15-question test. And to pass the test, applicants must score at least 80%. Test questions are from the South Carolina Commercial Driver Handbook. The Double/Triple trailers endorsement can be used with the Class A CDL. If you need additional information, please contact your local DMV office. You can find your nearest DMV office at South Carolina DMV locations.

You have made error(s) so far.
Your Challenge Library: 0

1. Why should you hang the electrical cable with the plug down when uncoupling?

2. When the air system is low ________.

3. Stop light switches are necessary because ________.

4. If you must stop on a one-way highway, you should place devices _____ ft. toward the approaching traffic.

5. Dollies that have antilock brakes will have what color lamps on the left side of the dolly?

6. Coupling devices that connect the emergency and service air lines from the truck to the trailer are _______.

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