Free DE DMV Commercial Driver's Licenses Questions and Answers — Questions and Answers
Question 1: What should you do if your vehicle gets stuck on a railroad track and a train is approaching?
- Try to push the vehicle off the tracks
- Call emergency services and wait by the vehicle
- Get out of the vehicle and move away from the tracks (Correct answer)
- Stay in the vehicle and honk the horn
Correct answer: Get out of the vehicle and move away from the tracks
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?
- Downshift after you reach the bottom of the grade
- Downshift before starting down the grade (Correct answer)
- Downshift midway down the grade
- Do not downshift at all
Correct answer: Downshift before starting down the grade
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?
- The air compressor
- The slack adjusters (Correct answer)
- The air lines
- The air pressure gauge
Correct answer: The slack adjusters
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?
- P endorsement
- S endorsement (Correct answer)
- T endorsement
- H endorsement
Correct answer: S endorsement
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?
- Tire pressure
- Battery connections
- Fluid levels (oil, coolant, power steering) (Correct answer)
- Condition of the steering wheel
Correct answer: Fluid levels (oil, coolant, power steering)
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.
Free DE DMV Commercial Driver's Licenses Questions and Answers
What should you do if your vehicle gets stuck on a railroad track and a train is approaching?