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Washington DC CDL Practice Test: Double and Triples - Test 4 2020

(From the 2020 Washington DC 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 Washington DC 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 Washington DC DMV locations.

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

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

2. Stop light switches are necessary because ________.

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

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

5. When the air system is low ________.

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

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