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
List of questions
What is the function of an "application pressure gauge"?
What should you do when the low air pressure warning comes on?
What is a modulating control valve?
Which is true when checking air flow to all trailers?
When driving a truck with more than one trailer, which trailer should be first behind the truck?
If air supply drops when driving, the tractor protection valve ________.
How do air-operated disc brakes work?
A low pressure warning signal could be __________.
An air brake is made up of which of the following braking systems?
When uncoupling twin trailers you should park:
The service brake system ________.
On newer vehicles, the parking brake control knob is typically yellow, but on older vehicles, the parking brake might be what color?
You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking you should:
Why should you check the brake adjustment often?
The tractor protection valve should pop out when air pressure falls to:
Why does a heavily-loaded vehicle take longer to stop than a lightly-loaded vehicle?
Which of the following factors explains why the total stopping distance for air brakes is longer than that for hydraulic brakes?
When performing the controlled braking method for an emergency stop, you are _________.
If your vehicle has an alcohol evaporator, the evaporator's purpose is to _____.
The pintle hook should never be unlocked when: