Home
Study Plan
Get Pro
Review

Free District of Columbia CDL Double/Triple Trailers Practice Test 2021

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 2021 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
Study now
List of questions
1.
What is proper braking technique for drivers travelling down a hill or any other downgrade?
2.
When checking the low pressure warning signal, it should turn on before the pressure drops below what psi?
3.
When coupling, correct trailer height should:
4.
The most efficient way to drive down a long grade is to ________.
5.
You want to hook your combination to a second trailer that has no spring brakes. To do this without wheel chocks you should:
6.
On older vehicles, a low air pressure warning signal comes on at what psi?
7.
Before you can supply air to the air tanks of a second trailer you need to:
8.
If you want to couple a second trailer to your combination vehicle, secure it by using:
9.
An air compressor can be cooled by _______.
10.
A danger of a malfunctioning tractor protection valve is:
11.
When driving doubles or triples, for safer handling which trailer should be at the rear?
12.
If your vehicle is not equipped with ABS, when you brake hard on a slippery surface what may occur?
13.
Where is compressed air stored?
14.
Which of the following is the most common reason brakes fade?
15.
Wedge brakes and disc brakes are ______ than s-cam brakes.
16.
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
17.
If the air compressor does not have its own oil supply, how is it lubricated?
18.
Why should you drain water from compressed air tanks?
19.
You are doing a walk around inspection of a double or triple trailer rig. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _________.
20.
You can test whether the trailer air system is charged by:
District-of-columbia Pre-Trip TestDistrict-of-columbia Hazmat TestDistrict-of-columbia School Bus TestDistrict-of-columbia Air Brake TestDistrict-of-columbia General Knowledge TestDistrict-of-columbia Combination Vehicles TestDistrict-of-columbia Doubles/ Triples Trailers TestDistrict-of-columbia Tanker Vehicles TestDistrict-of-columbia Passenger Vehicles Test