Air Brakes Endorsement Test | New Hampshire 2025 #1

Train for FREE online with our New Hampshire CDL air brake 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 NH Class A/Class B driver license 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 the requirements for CDL may vary from state to state.

Number of Question 25

Passing Score 20

Number of Tests 20

1 . A low air pressure warning signal should activate:

When tank pressure falls below 120 psi.

When tank pressure falls below 55 psi.

When tank pressure falls below 10 psi.

In an air brake system, a low air pressure warning signal must come on if air pressure in the tanks falls below 55 psi. This warning signal may come in the form of a light, a buzzer, or a wig wag.

2 . Using the brakes creates heat. If too much heat is produced:

The brakes may not work.

The brakes may squeak more than usual.

The brakes will brake unevenly.

Brakes are designed to take a lot of heat, but drivers should not rely solely on the brakes to slow their vehicle. Brakes may fade and lose their ability to slow down the vehicle if they become too hot, so drivers should also rely on the engine braking effect.

3 . When traveling down a steep downgrade:

The air brakes should be used.

The vehicle should be placed in a low gear and the driver should use engine braking.

The driver should continually downshift instead of using the brakes.

On long and/or steep downgrades, you should primarily use engine braking to control the speed of your vehicle. Use your brakes only as a supplement to this effect.

4 . During a walk-around inspection, ensure there are no cracks on the brake drums that are more than ____ of the width of the friction area.

One half

One quarter

One third

One tenth

Before beginning a trip, it is important to check the brake drums during your walk-around inspection. It is unsafe to drive if any brake drum has a crack more than one half of the width of the friction area.

5 . What is removed when an air tank is drained?

Water and oil

Ammonia

Liquid cleaners

In an air brake system, air tanks have drains to remove accumulations of water and compressor oil. Allowing water and oil to accumulate in the system could cause damage to the brakes.

6 . Some air brake systems use alcohol:

To reduce the risk of ice forming in air brake valves.

To make the compressor run more efficiently.

To lubricate parts of the braking system.

To reduce the risk of rust forming on air brake valves.

Some air brake systems contain an alcohol evaporator. This device introduces alcohol into the braking system to inhibit the formation of ice.

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2025 New Hampshire | Frequently Asked Questions

To acquire a CDL Hazmat endorsement in New Hampshire, you must have a valid commercial driver's license (CDL). Then, pass the Hazardous Materials Knowledge Test at your local DMV. You'll also need to submit a fingerprint-based background check and complete the TSA security threat assessment. Once these steps are completed, you can receive your Hazmat endorsement.

To obtain a CDL Hazmat license, you first need to have a valid Commercial Driver's License (CDL). You must be at least 21 years old and a U.S. citizen or have legal status. You're required to pass the Hazardous Materials Endorsement Knowledge Test, provide proof of identity, and undergo a TSA background check and fingerprinting.

When applying for a CDL Hazmat endorsement, you'll need to present your current valid Commercial Driver's License (CDL). You'll also need proof of U.S. citizenship or legal status, such as a birth certificate or green card. A completed application form, along with payment for the fees, is also required. Lastly, you'll need to submit your TSA background check and fingerprinting results.

Yes, there is a dedicated written test for the CDL Hazmat endorsement. This test is known as the Hazardous Materials Endorsement Knowledge Test. It covers the special rules and safety procedures for hauling hazardous materials. You must pass this test to obtain your Hazmat endorsement. Preparation may involve studying a state-specific CDL manual or taking practice tests.

The written test for the CDL Hazmat endorsement covers a range of topics related to hazardous materials. These include identifying different types of hazardous materials, understanding shipping papers, using placards and labels, loading and unloading hazardous materials, responding to emergencies and spills, and complying with federal and state regulations.

Yes, acquiring a CDL Hazmat endorsement in New Hampshire does involve extra charges. These include a fee for the written test, the TSA background check, and the endorsement itself. The exact amounts can vary, but you can expect to pay around $100 for the TSA check and $10 for the endorsement.

Yes, background checks are mandatory for the CDL Hazmat endorsement. The Transportation Security Administration (TSA) requires a security threat assessment, which includes fingerprinting and a criminal history check. Applicants must be U.S. citizens or have legal status. They cannot have convictions for certain crimes or pose a threat to national security, transportation security, or infrastructure.

Yes, obtaining a CDL Hazmat endorsement requires specialized training. The training covers topics like handling hazardous materials, safety procedures, and federal regulations. After training, you must pass a written test to get the endorsement. The training can often be completed through the same institution where you get your Commercial Driver’s License.

No, you cannot transport hazardous materials without a valid CDL Hazmat endorsement in New Hampshire or any other state. This endorsement is required by federal law and ensures that drivers are properly trained and capable of safely transporting hazardous materials. Violating this requirement can result in substantial fines and penalties.

Yes, you can add the CDL Hazmat endorsement to your current CDL license. However, it's not a simple addition. You'll need to pass a written test, provide proof of U.S. citizenship or legal status, and successfully complete a TSA background check. Once these steps are completed, the endorsement can be added to your existing CDL license.