Free District of Columbia CDL Double/Triple Trailers Practice Test 2022

Do you know how to pair double or triple trailers? If you are planning to take the CDL double/triple trailer endorsement test, make sure to know it! Our CDL practice test has the same questions as the real exam which is based on the DC CDL Manual. They cover 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 District of Columbia 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 2022 DC commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
DC CDL Double/Triple Trailers Test format:
20 questions
16 correct answers to pass
80% passing score
List of questions
1.
What is the purpose of a modulating control valve?
2.
What is the "cut-in" pressure for most air compressor governors?
3.
To test the tractor protection valve, the engine needs to be:
4.
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
5.
On large buses low pressure warning devices usually signal at ______.
6.
Air brakes take longer to stop than hydraulic brakes because _______.
7.
In terms of stability, doubles and triples are:
8.
How often should alcohol containers be checked during cold weather?
9.
Brake linings should not be _______.
10.
A front brake limiting valve ______.
11.
When checking that air is flowing to all trailers,what is used to provide air to the supply lines?
12.
When testing the trailer emergency brakes, charge the system, pull out the trailer air supply control, and:
13.
Why should you never leave your vehicle unattended without applying the parking brakes?
14.
Why should air tanks be drained completely?
15.
A safe speed on a curve for a smaller commercial vehicle:
16.
What does the air compressor governor control?
17.
In dual-air systems the pressure should build to _______.
18.
If the malfunction lamp stays on after the bulb check, __________.
19.
To position the converter dolly over short distances you can:
20.
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?