Pennsylvania CDL Combination case studies
Pennsylvania CDL Combination · Put your knowledge to work in context.
The Pennsylvania CDL Combination knowledge test is the written exam a driver must pass to be licensed for combination vehicles - the tractor-trailer and doubles/triples configurations that require a Class A credential or a Class B vehicle towing a heavy trailer. It is intended for new CDL applicants, drivers upgrading from a Class B or Class C license, and out-of-state drivers transferring a combination endorsement to Pennsylvania. The Pennsylvania CDL Combination case studies are 5 cases and about 2,794 words.
1Coupling a Trailer Left at an Angle After a Drop
At a Pennsylvania distribution center, you are assigned a 53-foot van trailer that a previous driver dropped on a gravel pad. The trailer is loaded to 34,000 lb, the landing gear is set, and the trailer sits about 4 inches left of the tractor centerline with the nose slightly high.
610 words, about 3 min2Speed Control on a Long Pennsylvania Downgrade
You crest a 4-mile, 7% downgrade on a Pennsylvania interstate at 45 mph with a 78,500-lb combination: three-axle tractor, 53-foot trailer, drum brakes all around, engine brake on high, automatic transmission in drive. The posted limit is 55 mph.
555 words, about 3 min3Right Turn With Off-Tracking Around a Borough Corner
You drive a 53-foot trailer with a 3-axle tractor and want to turn right from a two-lane one-way street onto a narrower cross street in a Pennsylvania borough. The corner has a 35-foot curb radius, a traffic signal pole about 6 feet inside the curb, and a cyclist waiting at the crosswalk on your right.
544 words, about 3 min4Scale Ticket With Axle and Gross Overloads
At a Pennsylvania weigh station, your 3-axle tractor and 53-foot trailer scale: steer 12,480 lb; drive tandems 33,600 lb; trailer tandems 34,300 lb; gross 80,380 lb. The scale ticket lists common limits of 12,000 lb on the steer axle, 34,000 lb on each tandem, and 80,000 lb gross.
530 words, about 3 min5Trailer Supply Air Leak at the Glad Hand
After coupling to a loaded 53-foot trailer, you build tractor pressure to 120 psi, release the parking brake, and move the trailer air-supply (red) and service (blue) lines. The trailer spring brakes will not release.
555 words, about 3 min