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 a modulating control valve?
2.
What is the "cut-in" pressure for most air compressor governors?
3.
To test the tractor protection valve, the engine needs to be:
4.
An application pressure gauge shows how much air you are applying to the brakes. Increased application pressure to maintain the same speed indicates that __________.
5.
Automatic slack adjusters ________.
6.
In terms of stability, doubles and triples are:
7.
With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the trailer. When you do this, you should hear:
8.
Brake linings should not be _______.
9.
You should check trailer height before connecting a converted dolly to a second or third trailer. The trailer height is right when:
10.
You are driving a set of doubles and a set of trailer wheels goes into a skid. Which of these is most likely to occur?
11.
During normal operation, the brakes of the double/triple trailer are controlled by:
12.
Pushing the brake pedal down when the spring brakes are on could _________.
13.
When increased application pressure to maintain the same speed becomes necessary, you should ______.
14.
When testing the trailer emergency brakes, charge the system, pull out the trailer air supply control, and:
15.
Why should you never leave your vehicle unattended without applying the parking brakes?
16.
What does the air compressor governor control?
17.
In dual-air systems the pressure should build to _______.
18.
What affects the stopping distance for air brakes?
19.
To position the converter dolly over short distances you can:
20.
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?