Before driving a vehicle with a dual air brake system, allow time for the air compressor to build up a minimum of 100 psi pressure in both the primary and secondary systems. Watch the air pressure gauges to monitor the pressure levels.

Let the air compressor build up a minimum of 100 psi pressure in the primary and secondary systems before driving.

Let the vehicle warm up before driving to ensure that the fuel reaches the engine.

Let the air compressor build up a minimum of 100 psi pressure in the primary and secondary systems before driving.

Begin driving just after the vehicle starts.

It is critical that an engine have sufficient oil pressure. The engine can be destroyed rapidly if run without oil.

An engine can be destroyed quickly.

A vehicle will get better gas mileage.

An engine can be destroyed quickly.

An Anti-Lock Braking System (ABS) won’t work properly.

In an air brake system, the air compressor pumps air into the air storage tanks. The air compressor is controlled by the air compressor governor.

It pumps air into the air storage tanks.

It moves air to the back of the truck.

Backing is always dangerous because it is impossible to see everything that is behind your vehicle. Only drive in reverse if it is absolutely necessary.

It is difficult for the driver to see behind the trailer.

There may be extra weight in the front of the vehicle.

Cargo may fall out of the trailer.

Trailers are not made to be driven in reverse.

You should accelerate very gradually when driving under slippery conditions. Using too much power in such conditions may cause you to lose control of your vehicle.

To keep from losing control of the vehicle.

Because it is always good to accelerate slowly.

To keep from losing control of the vehicle.

To keep from accelerating faster than the vehicle ahead.

A driver's seat should always be equipped with a seat belt. You must wear a seat belt at all times while operating a CMV.

You must always wear a seat belt.

You do not need to wear a seat belt.

You are required to wear a seat belt, but only if driving a tank trailer.

You must always wear a seat belt.

Class B Driving Test | Vermont 2025 #2 Page 2 of 7

Train for FREE online with our Vermont 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 VT 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.

Number of Question 50

Passing Score 40

Number of Tests 20

Class B Driving Test | Vermont 2025 #2 Page 2 of 7

8 . When operating a vehicle with a dual air brake system, the driver should:

9 . Without engine oil:

10 . What can happen if the air pressure gets too low in an air brake system?

11 . What does an air compressor do in an air brake system?

12 . Backing with a trailer is dangerous because:

13 . When traction is poor, a driver should accelerate especially slowly:

14 . When operating a truck requiring a CDL:

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