FREE CDL Combination Vehicles Practice Test Online | Colorado 2024 Page 3 of 3
Train for FREE online with our Colorado 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 CO 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.
15 . A shut-off valve:
Shut-off valves are used in air supply lines to control the passage of air from one trailer to another. The rear shut-off valve should always be closed to prevent air from leaving the braking system.
16 . After coupling, there should be ____ between the upper and lower fifth wheel.
Before a trip, be sure to inspect all couplings. There should be no space between the upper and lower fifth wheel.
17 . Driving a combination vehicle ____ than driving a single vehicle.
Driving a combination vehicle usually requires more skill than driving a single vehicle. Combination vehicles are generally longer and heavier than single commercial vehicles.
18 . In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:
In vehicles equipped with an automatic tractor protection valve, the valve will pop out if air pressure drops to a level between 20 and 45 psi. When the valve pops out, the protection valve will close, stopping the flow of air.
19 . Push in the trailer air supply control to:
Push in the trailer air supply control to supply the trailer with air. Pull out the trailer air supply control to turn off the air supply and activate the emergency brakes.
20 . When traveling more slowly than 40 mph, maintain at least ____ of following distance per every 10 feet of your vehicle.
At speeds below 40 mph, you should allow at least one second of following distance for every 10 feet of your vehicle. Follow the same formula when traveling at faster speeds, then add one additional second to your following distance. Remember that larger vehicles require more space to stop than smaller vehicles.
See the exact questions that will be on the 2024 Colorado DMV exam.
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