Free District of Columbia CDL Combination Vehicles Practice Test 2022

You have to pass the CDL combination vehicles endorsement to get ready for propelling your career with your license. You are looking for a good DC CDL practice test source for your coming CDL test? You are in the right place. Our practice test is a great resource for beginners. The CDL practice test is designed for you to have exactly the experience of the exam as you will be more familiar with both the test format and the subject. They cover topics ranging from combination vehicle maintenance to safely driving a complex rig. Each question is based on the official DC CDL Manual so you can be sure that the information in our test is accurate and relevant to your examination. In addition, each question has a detailed explanation so that it is very useful for you to learn from your mistakes. Preparing well before test day with questions and content that we cover. Start with our Free District of Columbia CDL Combination Vehicles Practice Test today and walk out with your endorsement!

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 Combination Vehicles Test format:
20 questions
16 correct answers to pass
80% passing score
List of questions
1.
To prevent moisture from entering the electrical cable when disconnected:
2.
One good way to prevent rollover is:
3.
When inspecting the coupling area, all of the following are required except:
4.
The shut-off valves at the back of the last trailer should be:
5.
The trailer service brakes should be tested with the hand control, and controlled during normal operation by:
6.
Supplied by the service line from the tractor, each trailer or dolly has its own:
7.
To help prevent rollover, keep the center of gravity of the load as low as possible, and:
8.
In order to allow the trailer brakes to be applied more quickly, what is connected to the service air line?
9.
A major leak in the trailer emergency line will cause:
10.
When driving a combination vehicle with multiple trailers or dollies, all air shut-off valves except the last one at the back must be:
11.
To stop other drivers from passing you on the right when turning wide:
12.
The trailer hand valve should be used:
13.
The emergency air line controls the emergency brakes on combination vehicles, and:
14.
When unlocking the fifth wheel in Step 6, all of the following apply except:
15.
If the wheels of the trailer lock up and the trailer swings around, it could cause a:
16.
Trailers will have an ABS malfunction lamp:
17.
When uncoupling, the tractor should:
18.
Trailer landing gear:
19.
When coupling or uncoupling, all of these apply to the trailer except:
20.
To test the trailer brakes before driving, use the hand valve or the: