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.
These 10 free KS-CDL questions are organized by exam domain, so you can see how each part of the Kansas CDL Permit Test blueprint is tested. Reveal the answer and explanation under each question.
A commercial driver reports for duty with a measured blood alcohol concentration of 0.03% and no visible signs of impairment. Which rule governs this situation?
Correct answer: C - The driver must not operate and is subject to a 24-hour out-of-service period
A 60-foot tractor-semitrailer is traveling 45 mph on dry pavement in daylight. Before adding any extra margin for traffic or weather, what following interval is the minimum under the CDL length-and-speed rule?
Correct answer: C - 7 seconds
During a pretrip inspection, one major groove of a steering-axle tire measures 3/32 inch; the other major grooves measure 5/32 inch, and no cords are exposed. The tire should be:
Correct answer: D - Rejected; every major steering-tire groove must be at least 4/32 inch
During an air-brake check, the low-air warning first activates at 52 psi, and the parking-brake control pops out at 30 psi. How should these readings be evaluated?
Correct answer: D - The warning fails; the pop-out is within the normal range
A fifth-wheel tug test holds, but the visual inspection shows a slight gap between the upper and lower plates and the jaws appear closed around the kingpin head rather than the shank. What should the driver do next?
Correct answer: A - Treat it as a high coupling; uncouple and repeat the coupling procedure
The trailer's emergency brakes hold when the red supply control is pulled, but its service brakes do not respond to the tractor foot valve. Which line normally carries the missing brake-application signal?
Correct answer: B - The blue service or control line
At one loading facility, a vehicle receives 700 pounds of Class 3 material and 600 pounds of Class 8 material, all in non-bulk packages. No Table 1 material or special exception is involved. Which placard choice is permitted?
Correct answer: D - Use DANGEROUS placards instead of separate FLAMMABLE and CORROSIVE placards
At a rural stop, a school-bus driver counted six students boarding but can now account for only five; a backpack remains near the right-front danger zone. Before moving, the driver must:
Correct answer: B - Secure the bus, remove the key, and check around and underneath it
Approaching a red light, the driver of a half-full smooth-bore tank trailer anticipates forward surge followed by rebound. The most effective braking approach is to:
Correct answer: A - Brake early and smoothly, then hold enough pressure at the stop to resist rebound
An occupied passenger bus is stopped 40 feet from a double-track railroad crossing. A train clears the near track, the warning lights stop, and the far track is partly obscured. What must happen before the bus proceeds?
Correct answer: D - Remain stopped until the driver verifies that no second train is approaching
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