Free South Carolina CDL Double/Triple Trailers Practice Test 2023

Do you know how to pair double or triple trailers? If you are planning to take the South Carolina CDL double/triple trailer endorsement test, make sure to know it! Our SC CDL Practice Test has the same questions as the real exam which is based on the SC CDL Manual. It covers most of the subject areas on the Double/Triple Trailers Test such as pulling double and triple trailers, the risk of rollover, managing space, and special considerations when hauling multiple trailers. In addition, each question has a detailed explanation that will help you understand the concept and answer future questions about it correctly. If you don't get the pass right away, you can take this CDL practice test an unlimited number of times to make sure you learn all the questions. Let’s try our Free South Carolina CDL Double/Triple Trailers Practice Test today and pass your CDL endorsement exam! Good luck and keep driving safely!

Our CDL practice tests:
Based on 2021 SC commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
SC CDL Double/Triple Trailers Test format:
20 questions
16 correct answers to pass
80% passing score
List of questions
1.
The part of the combination vehicle most likely to turn over is the:
2.
What is a modulating control valve?
3.
How can you be sure you supplied air to a second trailer?
4.
Automatic slack adjusters ________.
5.
To test the tractor protection valve, the engine needs to be:
6.
The converter dolly air tank drain valve on coupled double/triple trailers should be:
7.
In terms of stability, doubles and triples are:
8.
An air brake is made up of which of the following braking systems?
9.
If the rear trailer does not have spring brakes, disconnecting the emergency line after charging will:
10.
How do you check the low pressure warning signal?
11.
How should the air leakage rate be tested?
12.
When inspecting the shut-off valves on doubles and triples, all of the following is true except:
13.
The tractor protection valve should pop out when air pressure falls to:
14.
Vehicles without automatic air tank drains need to be checked manually to remove ________?
15.
When increased application pressure to maintain the same speed becomes necessary, you should ______.
16.
What does the air compressor governor control?
17.
Why should the air hoses connected to the brake chambers be checked?
18.
Which of the following factors explains why the total stopping distance for air brakes is longer than that for hydraulic brakes?
19.
Why should you drain water from compressed air tanks?
20.
In dual-air systems the pressure should build to _______.