Free DE DMV Commercial Driver's Licenses Questions and Answers

Question 1

What should you do if your vehicle gets stuck on a railroad track and a train is approaching?

Accepted Answer

Get out of the vehicle and move away from the tracks

Answer

If your vehicle is stuck on railroad tracks and a train is approaching, your immediate priority is personal safety. You must get out of the vehicle and move as far away from the tracks as possible, in the direction the train is coming from, to avoid debris. This action minimizes the risk of serious injury or fatality from the inevitable collision.

Question 2

When driving a commercial vehicle with a manual transmission, what is the proper way to downshift when going down a steep grade?

Accepted Answer

Downshift before starting down the grade

Answer

When driving a commercial vehicle down a steep grade, it is crucial to downshift to a lower gear *before* starting the descent. This allows the engine to provide braking power, known as engine braking, which helps control the vehicle's speed. Relying solely on the service brakes on a long downgrade can cause them to overheat and fail, leading to a dangerous situation.

Question 3

Which part of the air brake system must be checked to ensure that it is properly adjusted?

Accepted Answer

The slack adjusters

Answer

The slack adjusters are a critical component of an air brake system that must be checked to ensure proper adjustment. They maintain the correct distance between the brake shoes and the drum, which is essential for effective braking. Improperly adjusted slack adjusters can lead to reduced braking power and increased stopping distances, compromising vehicle safety.

Question 4

Which CDL endorsement is required to operate a school bus in Delaware?

Accepted Answer

S endorsement

Answer

To operate a school bus in Delaware, a driver must obtain a Commercial Driver's License (CDL) with an 'S' endorsement. This specific endorsement signifies that the driver has met the additional requirements and training necessary to safely transport students. While a 'P' endorsement is for general passenger transport, the 'S' endorsement is specifically mandated for school bus operation.

Question 5

When performing a pre-trip inspection, what should you check in the engine compartment?

Accepted Answer

Fluid levels (oil, coolant, power steering)

Answer

During a pre-trip inspection, checking fluid levels in the engine compartment is essential for safe vehicle operation. This includes verifying the levels of engine oil, coolant, and power steering fluid. Ensuring these fluids are at appropriate levels helps prevent mechanical breakdowns and ensures the vehicle's systems function correctly throughout the journey.

DE DMV - Delaware Department of Motor Vehicle Practice Test

DE DMV - Delaware Department of Motor Vehicle Practice Test

Free DE DMV Commercial Driver's Licenses Questions and Answers