FREE CDL Combination Vehicles Practice Test Online | Oklahoma 2024 Page 2 of 3
Train for FREE online with our Oklahoma 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 OK combination license in 2021, 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.
8 . Keeping cargo low can:
Rollovers can happen when a combination vehicle is turned too quickly. To help prevent the risk of rollover, it is important to keep the vehicle's center of gravity low by loading cargo as close to the ground as possible.
9 . All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).
All trailers and converter dollies manufactured on or after March 1, 1998 must have Anti-Lock Braking Systems (ABS).
10 . When the wheels of a trailer lock up:
A trailer may swing out and strike other vehicles if its wheels lock up. This is especially likely with lightly-loaded trailers.
11 . When a vehicle goes around a corner, the rear wheels:
When any vehicle goes around a corner, the rear wheels follow a different path than the front wheels. This is called off-tracking. The degree of off-tracking will be greater on long vehicles than on short vehicles.
12 . If color-coded, which color is used to identify emergency, or supply, lines?
Air lines are sometimes color-coded to help drivers avoid mistakes when coupling glad hands. Typically, blue is used for service lines and red is used for emergency lines.
13 . When coupling:
Incorrect coupling and uncoupling of combination vehicles can have extremely dangerous consequences.
14 . What is the Johnson bar?
The trailer hand valve, also called the trolley valve or Johnson bar, is used to work the trailer brakes. It should be used only to test the brakes. Using it while a vehicle is in motion could cause a skid.
See the exact questions that will be on the 2024 Oklahoma DMV exam.
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