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These 10 free OK-CDL questions are organized by exam domain, so you can see how each part of the Oklahoma CDL Permit Test blueprint is tested. Reveal the answer and explanation under each question.
A driver will operate a tractor-semitrailer with a gross combination weight rating of 30,000 pounds. The trailer has a gross vehicle weight rating of 14,000 pounds, and the load requires no passenger or hazardous-material endorsement. Which CDL class is required?
Correct answer: B - Class A
During a pre-trip inspection, a driver measures 3/32 inch of tread in a major groove on a steering-axle tire. Each drive-axle tire also measures 3/32 inch, and no other tire defects are found. How should the driver handle this finding?
Correct answer: D - Correct the steering-tire defect before operating; the drive tires meet the tread minimum
At 55 mph, a driver's perception distance is 142 feet, reaction distance is 61 feet, braking distance is 216 feet, and air-brake lag adds about 32 feet. The road is visible for only 430 feet ahead. Which conclusion best applies?
Correct answer: C - The driver must slow because total stopping distance exceeds the visible roadway
A front tire suddenly blows out while a loaded commercial vehicle is traveling at highway speed. Which initial response gives the driver the best chance of maintaining control?
Correct answer: A - Hold the wheel firmly, stay off the brake initially, and let the vehicle slow
Before descending a long grade, a driver selects 35 mph as a safe speed and shifts to the proper low gear. When speed rises back to 35 mph, which braking technique is appropriate?
Correct answer: C - Apply the brakes firmly until speed falls to about 30 mph, release them, and repeat as needed
An 18,000-pound machine is secured by four tiedowns, each rated at a 2,000-pound working load limit. The aggregate tiedown capacity must equal at least one-half of the cargo weight. Which assessment is correct?
Correct answer: B - Inadequate: 8,000 pounds is below the 9,000-pound minimum
With a fully charged combination vehicle, the engine is off and the parking brakes are released. Air pressure drops 2 psi in one minute with the service brakes released. With the service brake held, pressure then drops 9 psi in two minutes. Combination limits are less than 3 psi per minute released and no more than 4 psi per minute applied. How should the results be interpreted?
Correct answer: D - The released test passes, but the applied loss is excessive and requires correction
During an air-brake check, the low-air warning activates at 58 psi and the spring brakes begin to apply at 28 psi. What do these two readings indicate?
Correct answer: A - Both activation points are within the expected ranges
A semitrailer reservoir is charged, and the trailer wheels roll freely with the supply control pushed in. Applying either the foot brake or trailer hand valve produces no trailer braking. Pulling out the red supply control causes the trailer emergency brakes to apply. Which fault best fits these findings?
Correct answer: B - The blue service line is disconnected or blocked
After coupling a tractor to a semitrailer, which observation confirms that the fifth wheel is properly locked?
Correct answer: C - There is no gap, and the jaws are closed around the kingpin shank
The OK-CDL exam also covers these domains. Drill them in the full free practice test:
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