Knowledge Test Class B #2

Class B Driving Test | Iowa 2024 #2 Page 4 of 7

Train for FREE online with our Iowa 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 IA CDL class B permit in 2024, practice as much as.. Read More

Train for FREE online with our Iowa 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 IA 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.

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22 . The two markings on a front brake limiting valve usually read:

Some vehicles with air brake systems manufactured before 1975 have a front brake limiting valve with "normal" and "slippery" settings.

23 . Black ice is:

Black ice is a layer of ice that is thin and clear enough for the road to be visible through it. The surface will look like a wet road. Always be alert to black ice if the road looks wet when the temperature is below freezing.

24 . People working on a disabled vehicle:

Be cautious when driving near people who are working on a disabled vehicle on the side of the road. They may be focused on the repair and not paying attention to nearby traffic.

25 . During a pre-trip inspection, belts should be:

When inspecting your vehicle, you should check all belts for tightness and excessive wear.

26 . If you are being tailgated, you should:

If someone is following you too closely, you should open up the space in front of your vehicle to make it easier for the tailgater to pass. Speeding up is counterproductive because the other driver may just continue tailgating you at the higher speed, only increasing the danger.

27 . What is the average driver’s reaction time?

The average driver has a reaction time between three-quarters of a second and one second. At 55 mph, this corresponds to a distance of 61 feet traveled.

28 . What is often found in compressed air?

Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Tanks must be drained regularly to remove this build-up.

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