10 exam-style questions with answers and explanations, straight from our 1,030-question bank. Tap an answer to check yourself. When you're ready, take the scored version in the free practice test.
A combination vehicle has a power-unit GVWR of 19,000 pounds, a semitrailer GVWR of 12,000 pounds, and a GCWR of 31,000 pounds. Which CDL class is required?
Correct answer: B - Class A; the GCWR is at least 26,001 pounds and the trailer exceeds 10,000 pounds
An experienced Wyoming Class B driver is adding the H endorsement for the first time. The driver has not completed hazardous-materials theory training. What must occur before the H knowledge test may be attempted?
Correct answer: D - Complete HazMat theory with a registered ELDT provider
During a pre-trip inspection, which tread-depth finding fails the minimum requirement?
Correct answer: A - A front steering tire measuring 3/32 inch in a major groove
On a wet highway, a 70-foot commercial vehicle is traveling at 45 mph. Using the standard following-distance rule and doubling the interval for the wet surface, what minimum interval should the driver maintain?
Correct answer: C - 16 seconds; double the eight-second dry-road interval
A driver has selected a low gear before descending a long grade. The safe speed is 35 mph. Which pattern correctly applies snub braking?
Correct answer: C - At 35 mph, brake firmly to about 30 mph, release fully, and repeat at 35 mph
The left-front tire of a tractor-trailer blows at highway speed, and the tractor pulls left. What should the driver do first?
Correct answer: A - Grip the wheel firmly, avoid hard braking, and slow gradually
A tractor-trailer becomes disabled on the shoulder of a divided highway where the view is unobstructed. Which placement pattern is correct for the three warning devices?
Correct answer: D - Within 10 feet, then 100 and 200 feet toward approaching traffic
Cargo was inspected at departure and again 48 miles later. The driver then travels 120 miles in 2 hours 20 minutes and goes off duty for a meal. When is the next cargo inspection required?
Correct answer: B - At the meal stop, because the break triggers another inspection
An 18-foot rigid crate is immobilized against forward movement by an adequate bulkhead and has two properly rated tiedowns. No special commodity rule applies. How should the driver assess the tiedown count?
Correct answer: D - Two tiedowns meet the minimum for this blocked 18-foot article
During an applied air-leakage test on a combination vehicle, the wheels are chocked, the system is fully charged, the engine is off, parking brakes are released, and the service brake is held after the initial pressure drop. Air pressure falls 3.5 psi in one minute. How should this result be interpreted?
Correct answer: C - Pass; a combination may lose up to 4 psi in one minute
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