NC CDL Combination Vehicles case studies
NC CDL Combination Vehicles · Put your knowledge to work in context.
The Combination Vehicles knowledge test is the Class A portion of North Carolina's commercial driver licensing knowledge exams. It is administered by the NCDMV and is taken by drivers who will operate a tractor-trailer, a truck towing a heavy trailer, or other vehicle combination whose towed unit exceeds 10,000 pounds gross vehicle weight rating. The NC CDL Combination Vehicles case studies are 5 cases and about 4,118 words.
1Brake Fade Three Miles Into a 6% Grade
Your tractor is a 3-axle conventional with a 10-speed manual, pulling a 53-foot van loaded to 79,500 lb GCW. You are 1 mile into a 4-mile, 6% downgrade on dry asphalt; the curve at the bottom is posted 40 mph with a 35 mph advisory.
852 words, about 4 min2Rear Pup Drifting on a Wet Downhill Ramp
You are pulling a set of 27-foot doubles at 60 mph on a downhill stretch of freeway where the right-hand ramp curves and drops. Each pup is loaded light, about 9,000 lb, and the pavement is wet.
848 words, about 4 min3Two Inches High and a Torn Gladhand Seal
Overnight a shipper dropped a loaded 53-foot van in a gravel lot. When you back under it at 6 a.m., the trailer's upper coupler plate sits about 2 inches higher than your fifth wheel, and the landing gear shoes have sunk into soft gravel so the trailer leans slightly left.
860 words, about 4 min4Two Leak Tests That Both Fail
You are running the pre-trip air check on a 3-axle tractor and a 2-axle van trailer. With the system fully charged to 120 psi, engine off, wheels chocked, and parking brakes released, the gauge falls to 113 psi in 60 seconds.
776 words, about 4 min51,600 Pounds Over on the Drives with Six Loose Pallets
A shipper has loaded 43,000 lb of canned goods into your 53-foot van: 20 pallets double-stacked in the nose, and 6 single pallets standing about 5 feet from the rear doors, not touching each other and not tied off. You scale the rig, a 3-axle tractor with sliding tandem and a trailer with sliding tandem, and get: steering axle 11,850 lb, drive tandems 35,600 lb, trailer tandems 29,550 lb, gross 77,000 lb.
782 words, about 4 min