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.
How can you be sure you supplied air to a second trailer?
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.
The increased likelihood of doubles and triples turning over is called:
7.
Which of these statements about the handling of doubles and triples is true?
8.
At 55 mph on dry pavement, the air brake lag distance is how many feet?
9.
Air tanks need to be drained ______.
10.
The trailer air supply control should pop out when the air pressure falls into the pressure range of:
11.
How should the air leakage rate be tested?
12.
During a normal drive, the spring brakes are held back by _____.
13.
When the safety valve releases air this indicates ___________.
14.
If you have manual transmission _________.
15.
What is a front brake limiting valve?
16.
Why should the air hoses connected to the brake chambers be checked?
17.
Why do some air brake systems have an alcohol evaporator?
18.
When inspecting doubles and triples shut-off valves, which of the following is true?
19.
When uncoupling the rear trailer, which of these should be done first?
20.
A visual inspection after coupling should show that: