Class B Driving Test | District Of Columbia 2024 #2 Page 5 of 7
Train for FREE online with our District Of Columbia class B license 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 DC CDL class B permit 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 CDL class B requirements may vary from state to state.
29 . A low air pressure warning signal should activate:
In an air brake system, a low air pressure warning signal must come on if air pressure in the tanks falls below 60 psi. This warning signal may come in the form of a light, a buzzer, or a wig wag.
30 . Most CDL holders have ____ licenses.
Most CDL holders who drive CMVs in interstate commerce are non-excepted interstate commerce drivers.
31 . In a vehicle with dual air brakes, what happens if one system is low on pressure?
In a dual air brake system, if one of the air systems gets very low on pressure, either the front or rear brakes will not be operating fully. You should bring your vehicle to a safe stop and have the air system repaired.
32 . Some air brake systems use alcohol:
Some air brake systems contain an alcohol evaporator. This device introduces alcohol into the braking system to inhibit the formation of ice.
33 . While driving, spring brakes are generally held in place by:
While driving, spring brakes are generally held in place by air pressure. If the air pressure gets low enough, the springs will activate the brakes.
34 . When approaching a curve during the on-road driving test, you must do all of the following, except:
When approaching a curve during the on-road driving test, you should thoroughly check traffic in all directions. Before entering the curve, reduce your speed sufficiently so that further braking or shifting is not required. Keep your vehicle in its lane and continue checking traffic in all directions.
35 . Hydroplaning occurs when:
Hydroplaning is an effect that occurs on wet roads when tires lose traction with the road surface and begin gliding along on a layer of water.
See the exact questions that will be on the 2024 District Of Columbia DMV exam.
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