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.

When tank pressure falls below 60 psi.

When tank pressure falls below 120 psi.

When tank pressure falls below 60 psi.

When tank pressure falls below 10 psi.

When tank pressure falls below 5 psi.

All electronic devices must be turned off while a written exam is being taken.

Cell phones must be turned off.

Cell phones may be placed on airplane mode.

Cell phones must be turned off.

Cell phones may be left on, but must be set in a face down position.

When inspecting your brakes, you should verify that the shoes and pads do not have any oil, grease, or brake fluid on them.

Not have any oil or grease on them.

Blocking and bracing are used to prevent cargo from shifting in transit.

Is dangerous and should never be done.

Is only done with liquid cargo.

After starting the engine of a vehicle equipped with an Anti-Lock Braking System (ABS), the indicator light should come on and then turn off. If the light stays on, something is wrong with the ABS.

The ABS indicator light should turn on, then quickly shut off.

The steering wheel will not move until the air tanks are full.

In situations where a driver cannot use a parking brake, wheel chocks can be used to hold a parked vehicle in place on a level surface.

Can be used to prevent a parked vehicle from moving.

Make it easier for a parked vehicle to roll.

Should only be used on the front driver's side tire.

To obtain a hazardous materials endorsement, you must first undergo a background check, which includes submission of your fingerprints.

Submit the password to your credit card.

Explain what types of materials you will be transporting.

Maximum axle weights are often set by a bridge formula, which sets a lower maximum weight for axles that are close together.

Permits less weight per axle for axles that are close together.

Permits more weight for trucks.

Class B Driving Test | Tennessee 2026 #1 Page 7 of 7

Train for FREE online with our Tennessee 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 TN CDL class B permit in 2026, 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.

Number of Question 50

Passing Score 40

Number of Tests 20

Class B Driving Test | Tennessee 2026 #1 Page 7 of 7

43 . A low air pressure warning signal should activate:

44 . During a written exam:

45 . Brake pads should:

46 . Blocking a load:

47 . If a vehicle is equipped with an Anti-Lock Braking System (ABS), when the vehicle is started:

48 . On flat surfaces, wheel chocks:

49 . If you require a hazardous materials endorsement, you will be required to:

50 . A bridge formula:

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