CDL COMBINATION VEHICLE EXAM, PRACTICE EXAM AND STUDY GUIDE NEWEST 2024 ACTUAL EXAM 300 QUESTIONS AND CORRECT DETAILED ANSWERS WITH (VERIFIED ANSWERS) |ALREADY GRADED A

CDL COMBINATION VEHICLE EXAM, PRACTICE EXAM AND STUDY GUIDE NEWEST 2024 ACTUAL EXAM 300 QUESTIONS AND CORRECT DETAILED ANSWERS WITH (VERIFIED ANSWERS) |ALREADY GRADED A Before a drive, ensure that air flows to all trailers by: - ANSWER- Opening the rear shut-off valves and listening for escaping air. Test the tractor protection valve by: - ANSWER- Releasing air with the brake pedal. Pull out the trailer air supply control to test: - ANSWER- The trailer emergency brakes. To prevent a rollover, a driver should: - ANSWER- Keep cargo low. One way to prevent a rollover is to: - ANSWER- Keep cargo centered on the rig. In a sudden turn, the ____ trailer is the most likely to turn over. - ANSWER- Last. Using the trailer hand brake while experiencing a trailer jackknife will: - ANSWER- Continue the skid. If you need to back your trailer but cannot back up in a straight path, you should: - ANSWER- Back toward the driver's side. Using the trailer hand valve while driving: - ANSWER- Can cause a skid. Push in the trailer air supply control to: - ANSWER- Supply the trailer with air. In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when: - ANSWER- Air pressure drops to a level between 20 and 45 psi. An air supply control in its "emergency" position will: - ANSWER- Apply the trailer emergency brakes. The service air line is attached to the: - ANSWER- Relay valves. The emergency air line: - ANSWER- Supplies air to the trailer air tanks. Trailers built before 1975 are: - ANSWER- Not required to have spring brakes. While inspecting a coupling, you should go under the trailer and: - ANSWER- Look into the back of the fifth wheel. If you are operating a vehicle built before 1998 and are unsure if the trailer has an Anti-Lock Braking System (ABS), you can: - ANSWER- Check for wheel speed sensors coming from the back of the brakes. After finishing a pre-trip inspection, you should: - ANSWERClose the emergency line valve. Close the service line valve. During a trip, which shut-off valves should be open? - ANSWER- All shut-off valves should be in the open position, except the rear shut-off valves. To test the trailer service brakes, you should: - ANSWER- Move the vehicle forward slowly and apply the brakes with the hand control. ____ are the cause of more than half of all accident-related truck driver deaths. - ANSWER- Truck rollovers. When traveling more slowly than 40 mph, maintain at least ____ of following distance per every 10 feet of your vehicle. - ANSWER- One second. Avoid needing to make sudden lane changes by: - ANSWERWatching the road ahead while driving. A lightly-loaded combination vehicle will stop more slowly than a fully loaded vehicle because: - ANSWER- The stiff suspension springs and strong brakes will have low traction. When driving a bobtail tractor, you should be aware that: - ANSWER- Bobtails are more difficult to stop than tractors with semitrailers.