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North Carolina CDL Practice Test: Double and Triples - Test 3 2020

(From the 2020 North Carolina CDL Handbook)
Number of tests: 26
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 North 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 North Carolina DMV locations.

You have made error(s) so far.
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1. The tractor protection valve ______.

2. Trailers that do not have spring brakes have emergency brakes, which work from ________.

3. What are hose couplers?

4. Usually, a fully charged air system has _______ psi.

5. The spring brakes come on when the air pressure drops into what range _________.

6. The pressure in the service line indicates ______.

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