Knowledge Test Class B #2
Class B Driving Test | North Dakota 2025 #2 Page 3 of 7
Train for FREE online with our North Dakota 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 ND CDL class B permit 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 CDL class B requirements may vary from state to state.
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15 . To drive a commercial vehicle across state lines, a driver must be at least:
25 years old.
A driver must be at least 21 years old to be licensed to drive a CMV across state lines.
16 . When changing lanes, you should:
Never use the right lane.
Always change lanes slowly and smoothly. If you did not see drivers who are already using the lane you wish to occupy, this will give them a chance to get out of your way or honk their horns to alert you. Always signal before changing lanes.
17 . What can happen if the air pressure gets too low in an air brake system?
The brakes will be very sensitive.
Pressing and releasing the brake pedal unnecessarily can let air out faster than the compressor can replace it, reducing the available air pressure. If the air pressure in an air brake system gets too low, the brakes will no longer work.
18 . A thin layer of ice that forms on road surfaces is called:
Blue ice.
Black ice is a thin layer of ice that is clear enough for the road surface to be seen through it. A road covered in black ice may look like it is merely wet. You should be very careful when temperatures are below freezing and the road looks wet.
19 . When approaching your vehicle as part of your pre-trip inspection, you should look for what as a sign of trouble?
When approaching a vehicle for an inspection, you should check underneath it for fresh oil, coolant, grease, or fuel leaked onto the pavement. Any of these could indicate a problem that will need to be repaired before the vehicle is driven.
20 . What is a danger of rolling back when you start to accelerate?
You may lose your position in traffic.
To avoid hitting someone or something behind you, it is important to ensure that your vehicle does not roll backwards when starting from a stop. If your vehicle has a manual transmission, partly engage the clutch before taking your foot off the brake.
21 . If a truck's Anti-Lock Braking System (ABS) is not working:
The truck will lack brakes on its left side.
