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.
After supplying air to the trailer, how should you check for crossed air lines?
2.
The trailer air supply control knob is:
3.
Over 50% of truck driver accident deaths are caused by:
4.
To prevent water and dirt from entering the air system, hose couplers can be attached to dummy couplers or:
5.
When uncoupling, make sure that the parking area:
6.
To make coupling and uncoupling a loaded trailer easier:
7.
When coupling, trailer height should:
8.
To help release the fifth wheel locking lever:
9.
The tractor should be positioned to back under the trailer:
10.
When you notice that your trailer has lost traction and is going into a skid, you should:
11.
Some of the points for inspecting the coupling include the following except:
12.
The best and earliest way to recognize that your trailer has started to skid is:
13.
A fifth wheel in proper position for coupling will have:
14.
Driving with an empty trailer:
15.
Like tractor air tanks, trailer air tanks should be kept free of dirt and oil by:
16.
The "rearward amplification" value means:
17.
All of these are part of the final 3 steps of uncoupling the trailer except:
18.
When backing under the trailer, do all of the following except:
19.
Before getting out to inspect the coupling, secure the vehicle by putting transmission in neutral, shutting off engine and taking the key with you, and:
20.
At the back of trailer used to tow other trailers are shut-off valves, also called: