CDL Full Practice Test Part 18

1. When are commercial motor vehicle drivers required to use headlights?

2. A driver performing a walk-around pre-trip inspection discovers the following exhaust system conditions: (1) The exhaust pipe has a small hole near the muffler allowing some exhaust gases to escape upward, (2) The exhaust mounting brackets are secure but one shows minor surface rust, (3) The exhaust pipe extends beyond the rear of the cab or sleeper berth and directs exhaust away from the vehicle. Which analysis correctly identifies which condition(s) require repair before operation?

3. A commercial driver begins a trip at 6:00 AM after 8 hours of sleep. By 2:00 PM, the driver has been on duty for 8 hours and on the road for 6 hours. The driver notices increasing difficulty maintaining steady lane position and realizes they were briefly unaware of the last few miles driven. What should the driver do?

4. A driver is inspecting a loaded flatbed trailer during the pre-trip inspection. The trailer carries steel coils loaded in the forward section. The driver observes that each coil is secured with two chains crossing over the top of the coil, and the chains are attached to anchor points on the trailer deck. The chains appear tight with no slack. The driver also notices that edge protection is not used between the chains and the steel coil edges. Based on 49 CFR Part 393 cargo securement requirements, what should the driver determine?

5. A driver is coupling a tractor to a semitrailer at a loading dock. The driver has positioned the tractor, connected the air lines, supplied air to the trailer, tested the trailer brakes, and backed under the trailer until the fifth wheel engaged. What should the driver do NEXT to complete the coupling procedure safely?

6. You are approaching a railroad-highway grade crossing while hauling placarded hazardous materials. The crossing has active warning signals with flashing red lights, but no train is visible. The crossing has multiple tracks, and traffic ahead of you has cleared the crossing. You must stop within what distance from the nearest rail?

7. A driver must perform an alley dock maneuver to back a 53-foot trailer into a dock located at the end of a narrow alley. The alley is approximately 12 feet wide and 40 feet long. The driver approaches perpendicular to the alley entrance. What is the correct sequence of actions to safely complete this maneuver?

8. During the cab check portion of a pre-trip inspection (with engine running), what is the maximum acceptable amount of steering wheel play (free play) for a commercial motor vehicle?

9. A property-carrying driver has accumulated 72 on-duty hours over the past 8 days and wants to drive today. The driver has not taken a 34-hour restart. What must the driver do before driving?

10. A driver starts a tractor-trailer and begins building air pressure. The pressure rises to 125 PSI and the governor cuts out, but the driver notices that when air pressure drops to 85 PSI during normal braking, the compressor does not start building pressure again. The driver continues driving and the pressure continues to drop. What is the most likely cause of this situation?