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 an antilock braking system (ABS)?
2.
What is the function of a stop light switch?
3.
The air compressor governor stops air from pumping when it reaches the "cut-out" level or around generally _________.
4.
You will test that the trailer service brakes are working by:
5.
After coupling, the air shut-off valves at the back of the first trailer should be:
6.
When coupling or uncoupling, trailer or dolly wheel should always be:
7.
At 55 mph on dry pavement, the air brake lag distance is how many feet?
8.
The most common type of foundation brake is?
9.
During a normal drive, the spring brakes are held back by _____.
10.
When the safety valve releases air this indicates ___________.
11.
After coupling the converter dolly to the first trailer, the pintle hook should be:
12.
In tractors and straight trucks spring brakes will come on fully when the air pressure drops to what range?
13.
What is a front brake limiting valve?
14.
Typically, air storage tanks hold enough air to allow the brakes to be used _______ even if the compressor stops working.
15.
Why do some air brake systems have an alcohol evaporator?
16.
Why should you never push the brake pedal down when the spring brakes are on?
17.
Water and oil _______.
18.
Where are the brake drums located?
19.
When inspecting doubles and triples shut-off valves, which of the following is true?
20.
A visual inspection after coupling should show that: