Iowa CDL General Knowledge Test case studies
Iowa CDL General Knowledge Test · Put your knowledge to work in context.
The Iowa CDL General Knowledge Test is the written knowledge exam that a driver must pass to obtain a Commercial Learner Permit (CLP) and begin the path toward a Commercial Driver's License (CDL) in Iowa. It is intended for drivers who operate or plan to operate commercial motor vehicles - tractor-trailers, straight trucks, buses, and vehicles carrying hazardous materials - and it is the shared foundation for every CDL class and most endorsements. The Iowa CDL General Knowledge Test case studies are 5 cases and about 3,422 words.
1Gauge, Smell, and the 6 Percent Grade
You are driving a five-axle tractor-semitrailer at 78,000 lb down a 6 percent grade that is 4 miles long. At the top you are at 45 mph in 8th gear of a 10-speed, engine rpm 1,500, and both air-pressure gauges read 105 psi.
777 words, about 4 min2The Right Turn That Isn't Wide Enough
You are driving a 70-foot tractor-semitrailer with a 53-foot trailer and a 4-foot rear-axle off-track. You need to turn right from a 12-foot lane into a 24-foot-wide industrial driveway.
716 words, about 4 min3The Load That Shifted Six Inches
You are hauling a 48-foot flatbed loaded with three steel coils, each 10,000 lb, arranged in a single row. Each coil is secured with four 5/16-inch grade 70 chains, each with a working load limit of 4,700 lb, attached to the trailer deck.
653 words, about 3 min4Fog With a 150-Foot Window
You are driving a 40,000-lb tractor-semitrailer at 3 a.m. on a two-lane rural road.
623 words, about 3 min5The Dripping Drum at the Dock
You are at a shipper's dock with a placarded straight truck. The shipping paper lists 4 drums of UN 1789, Hydrochloric Acid, Class 8, PG II, 800 lb total, along with general freight.
653 words, about 3 min