Combination #1
Combination Vehicles Practice Test | Utah 2025 #1 Page 3 of 4
Train for FREE online with our Utah CDL combination vehicle test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a UT combination license in 2025, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements for issuing a combination license may vary from state to state.
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17 . The emergency air line supplies air to the:
The emergency air line (also known as the supply line) has two functions. The first is to supply air to the trailer air tanks, and the second is to control the emergency brakes on combination vehicles.
18 . In an empty combination vehicle, the stiff suspension springs and strong brakes will have:
An empty combination vehicle will come to a complete stop more slowly than a fully-loaded vehicle. With less weight in a trailer, the stiff suspension springs and strong brakes will have lower traction than they would if the vehicle carried more weight.
19 . A combination vehicle has:
Four air lines.
Combination vehicles have two air lines: a service line and an emergency line.
20 . If you need to back your trailer but cannot back up in a straight path, you should:
Always turn to your right.
If you need to back your trailer but cannot back up in a straight path, you should back on a curved path toward the driver's side of the vehicle. This will permit you the best possible visibility while backing.
21 . Combination vehicles need extra space on the road because they:
Combination vehicles need more space on the road than other commercial vehicles because they are longer and need more space to turn and stop. It is especially important to properly manage space when you are operating a combination vehicle.
22 . When coupling a trailer, you should:
When coupling air brake hoses, you should make sure the proper pairs of gland hands are connected. They are sometimes color-coded to help drivers avoid mistakes. Typically, blue is used for service lines and red is used for emergency lines.
23 . The service air line is attached to the:
Steering wheel.
The service air line carries air and is controlled by either the foot brake or trailer hand brake. The service air line is attached to relay valves, which allow the trailer brakes to be applied quickly.
2025 Utah | Frequently Asked Questions
To secure a CDL Doubles/Triples endorsement in Utah, you first need a valid Commercial Driver's License (CDL). Next, study the Doubles and Triples section of the Utah CDL handbook. Then, schedule and pass the Doubles/Triples knowledge test at a Driver License Division office. After passing the test, you'll receive your endorsement. Remember, driving experience with these types of vehicles is beneficial.
To obtain a CDL Doubles/Triples license, you need a valid Commercial Driver's License (CDL). Study the Doubles and Triples section of your state's CDL handbook. Then, schedule and pass the Doubles/Triples knowledge test at your local driving license office. Upon passing, you will receive your endorsement. It's also recommended to have hands-on experience with these types of vehicles.
While it's not a legal requirement to have specialized experience or training for a CDL Doubles/Triples endorsement, it's highly recommended. This is because driving these types of vehicles requires specific skills. Studying the Doubles/Triples section of the CDL handbook and passing the knowledge test is mandatory, but practical experience can significantly improve safety and confidence.
Yes, to receive a CDL Doubles/Triples endorsement in Utah, you must pass an additional written knowledge test specifically for Doubles/Triples. This test covers the special procedures and safety considerations associated with operating these types of vehicles. It is separate from the general CDL written test. You can prepare by studying the Doubles/Triples section of your state's CDL handbook.
For the CDL Doubles/Triples endorsement, there isn't a specific skills or maneuvers test as there is with the basic CDL. The endorsement only requires a written knowledge test. However, the test will cover topics like coupling and uncoupling, inspecting doubles and triples, and managing the vehicles during different situations. These are skills you'll need to safely operate these vehicles.
No, it is not permissible to operate double or triple trailers without a valid CDL Doubles/Triples endorsement in Utah. The endorsement is required by federal and state law to ensure that drivers have the necessary skills and knowledge to safely operate these types of vehicles. Driving without the appropriate endorsement can result in fines and penalties.
You can append the CDL Doubles/Triples endorsement to your current commercial driver's license. You don't need to initiate a new application for a CDL. However, you'll need to pass the Doubles/Triples knowledge test. After passing, the endorsement will be added to your existing CDL. Remember, there's no skills test for this endorsement in Utah.
Yes, there are some limitations for drivers with a CDL Doubles/Triples endorsement. For instance, they can only drive vehicles that their base CDL allows. Additionally, all federal and state regulations regarding hours of service, vehicle maintenance, and safety inspections must be followed. Violating these rules can result in penalties or loss of the endorsement.
In Utah, double trailers can be up to 81 feet long and triple trailers up to 105 feet long. The maximum weight for both is 129,000 pounds. However, these limits can vary depending on the specific highways and routes used. Drivers should always check local regulations and restrictions before operating these types of vehicles.
Yes, drivers with a CDL Doubles/Triples endorsement must follow specific safety guidelines. These include checking that all couplings are secure, maintaining extra following distance, and taking wider turns to avoid trailer off-tracking. Also, they must be aware of the "crack-the-whip" effect, which can cause a rollover. Federal regulations also apply, such as hours-of-service rules.