CDL Full Practice Test Part 8

1. During the engine compartment inspection, you notice the fan belt has 1 inch of deflection when pressed with moderate thumb pressure. What does this indicate?

2. Which factor has the greatest influence on a combination vehicle’s rollover risk?

3. What are the three components that make up total stopping distance for a commercial motor vehicle?

4. A motor carrier receives a DVIR from a driver reporting that the slack adjuster on the right front brake shows 1.5 inches of push rod travel during the pre-trip inspection. The carrier notes this but dispatches the vehicle anyway. A roadside inspection later places the vehicle out of service for brakes out of adjustment. Which analysis correctly describes the regulatory failure in this situation?

5. During the CDL skills test straight-line backing exercise, an applicant must back a tractor-semitrailer through a straight corridor approximately 100 feet long with boundaries on both sides. The applicant makes two pull-ups during the exercise, looks in the direction of travel (backward) before each movement, and finishes within the boundaries without touching any lines. According to AAMVA Section 12M scoring criteria, how many points does this performance accumulate?

6. A driver has been on duty for 70 hours in the past 8 consecutive days operating under the 70-hour/8-day limit. On Day 9, the driver needs to determine whether a 34-hour restart will reset the duty cycle. The driver’s home terminal time zone is Eastern Time. Which condition must be met for a valid 34-hour restart?

7. You are driving a tractor-semitrailer at 55 MPH on a wet highway during heavy rain. You notice that the steering feels light and the vehicle is not responding normally to steering inputs. You suspect hydroplaning is occurring. What is the correct immediate response?

8. What is the proper function of an engine brake (jake brake) on a commercial motor vehicle, and when should it NOT be used?

9. A driver is preparing to make a left turn at a four-way intersection with a 53-foot trailer. There is traffic waiting to turn left from the opposite direction. The driver notices that if they turn from the center of the lane, the trailer will swing wide into the oncoming left-turn lane. What analysis should the driver make, and what action should they take?

10. A driver is operating a combination vehicle on an icy road when the trailer begins to swing outward to the left (trailer jackknife). The driver’s initial instinct is to apply the brakes hard and steer right to correct. What should the driver actually do, and why?