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

(From the 2020 South 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 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. The tractor protection valve ______.

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

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

4. What are hose couplers?

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

6. The pressure in the service line indicates ______.

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