Double Triple Test | Texas 2024 #1 Page 3 of 3
Train for FREE with our Texas CDL double triple practice test online. 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 TX CDL double triple license in 2024, 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 may vary from state to state.
15 . The service air line is attached to the:
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.
16 . If you must drive in reverse, it is helpful to:
If you must drive in reverse, you should first walk around the vehicle to check for hazards in your path of travel. Make frequent use of the mirrors on both sides of your vehicle while backing. Always back up as slowly as possible.
17 . A vehicle should be equipped with all of the following, except:
Commercial vehicles should always carry the proper emergency equipment. Be sure your vehicle is equipped with at least one fire extinguisher; spare electrical fuses, unless the vehicle is equipped with circuit breakers; and warning devices for parked vehicles, such as warning triangles, fuses, or liquid burning flares.
18 . A visual low pressure warning signal should activate before air pressure drops to a level between:
A visual low pressure warning signal should activate before air pressure drops to a level between 55 and 75 psi. This signal could be a light, a buzzer, or a wig wag.
19 . In a set of doubles, the shut-off valves at the rear of the first trailer should be:
When operating a double or triple, the shut-off valves at the rear of the last trailer should be closed. All other shut-off valves should be open.
20 . Trailers built before 1975 are:
Trailers built before 1975 are not required to have spring brakes. When parking a trailer without spring brakes, be sure to use wheel chocks to prevent the trailer from rolling.
See the exact questions that will be on the 2024 Texas DMV exam.
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