The emergency air line controls the emergency brakes on a combination vehicle. A loss of air pressure in the emergency line will cause the emergency trailer brakes to activate.

The emergency brakes will activate.

The Anti-Lock Braking System will activate.

The service air line will activate.

The emergency brakes will activate.

Fully-loaded rigs are more vulnerable to rolling over than empty rigs because the weight of the cargo gives the vehicles higher centers of gravity.

Are more likely to roll over than empty rigs.

Usually are very responsive to steering.

Are more likely to roll over than empty rigs.

When making mirror checks, you should look at the mirrors fairly quickly. If you spend too much time looking in a mirror, you may travel a substantial distance down the road without seeing what is coming up ahead.

Stare at the mirror for a long time.

Use only the driver’s side mirror.

The liver removes alcohol from the body at a fixed rate. Despite popular belief, tricks like drinking coffee or taking a cold shower will not speed up the process. The only way to become sober is to allow your body the time it needs to remove the alcohol from your system.

More quickly if the person stays awake.

If your vehicle begins to hydroplane, do not apply the brakes. Instead, slow down by releasing the accelerator and pushing in the clutch. This will help you to regain traction.

Turn the steering wheel as hard as possible.

Double Triple Test | Iowa 2024 #1 Page 2 of 3

Train for FREE with our Iowa 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 IA 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.

Number of Question 20

Passing Score 16

Number of Tests 20

Double Triple Test | Iowa 2024 #1 Page 2 of 3

8 . If the emergency air line loses pressure:

9 . If your brakes fail on a downgrade, your best hope to stop is to:

10 . Fully-loaded rigs:

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

12 . When using a mirror, you should:

13 . Alcohol is removed from the body:

14 . If your vehicle is hydroplaning, you should:

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