Mississippi CDL Combination study guide
Mississippi CDL Combination · Work through your exam, one topic at a time.
The Mississippi CDL Combination Vehicles Knowledge Test is a required written component for drivers seeking a Class A commercial driver's license (CDL) or certain Class B combinations in Mississippi. It assesses your knowledge of safe operation of tractor-trailers and other combination vehicles, including coupling and uncoupling, air brake systems, inspection procedures, turning and backing, rollover prevention, skid recovery, and special trailer types. The Mississippi CDL Combination study guide has 8 sections and about 2,794 words.
01Driving Combination Vehicles Safely
The Mississippi CDL Combination exam tests how a tractor-trailer behaves differently from a car or single-unit truck: greater length, weight, pivot points, blind spots, and stopping distance. Expect questions on following distance, off-tracking, trailer swing, and safe speed.
347 words, about 2 min02Air Brakes and Braking Systems
This domain tests the air-brake system on a combination vehicle: compressor and governor, reservoirs, foot valve, relay valve, spring brakes, tractor protection valve, and the red and blue trailer lines. Expect questions on pre-trip air-brake tests and on what happens when pressure falls.
380 words, about 2 min03Coupling and Uncoupling
This domain tests the sequence for connecting and separating a tractor and trailer safely. The exam focuses on fifth-wheel and kingpin checks, the tug test, air-line connection, landing gear, and wheel chocks.
371 words, about 2 min04Inspecting Combination Vehicles
This domain tests the combination-vehicle pre-trip inspection. The exam expects you to check the tractor, the trailer, and the connection between them, not just the power unit.
323 words, about 2 min05Turns, Lane Changes, and Backing
This domain tests low-speed control of a combination vehicle. The exam focuses on off-tracking, right and left turns, mirror use, lane changes, and safe backing.
374 words, about 2 min06Rollover Prevention and Weight Distribution
This domain tests why combination vehicles roll over and how weight placement affects steering, traction, and axle loading. Expect questions on center of gravity, speed in curves, sliding fifth wheels and tandems, axle limits, and load securement.
329 words, about 2 min07Skid Recovery and Emergency Maneuvers
This domain tests what to do when traction is lost or a system fails. The exam focuses on brake skids, drive-wheel skids, trailer skids, brake failure, tire blowouts, and off-road recovery.
338 words, about 2 min08Special Combinations and Trailer Types
This domain tests the extra hazards of doubles and triples, tankers, flatbeds, lowboys, livestock trailers, refrigerated trailers, auto transports, and oversize loads. Expect questions on endorsements, surge, clearance, securement, and vehicle-specific handling.
332 words, about 2 min