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 CCTS questions are organized by exam domain, so you can see how each part of the Certified Commercial Tire Service Instructor blueprint is tested. Reveal the answer and explanation under each question.
A fleet operates interstate buses and truck tractors. The tires offered for four installations meet the applicable size, load, speed, and condition requirements, and the regrooved tire was designed for regrooving. Which proposed placement is nevertheless prohibited by 49 CFR 393.75?
Correct answer: D - A retreaded tire on the front steering axle of a bus.
A disabled tractor-trailer is on the right shoulder of a two-way, undivided rural road. Its flashers are on. A hillcrest 250 feet behind it hides a warning triangle placed 100 feet behind; a location 350 feet behind provides ample warning to approaching drivers. Forward visibility is unobstructed. In which arrangement should the three warning triangles be placed under 49 CFR 392.22? Distances are measured from the vehicle; the near triangle is on its traffic side, and the distant triangles are in line with the occupied shoulder.
Correct answer: D - Approximately 10 feet behind, 100 feet ahead, and 350 feet behind.
During a steer-tire inspection, an apprentice records 1/32 inch with the tread-depth probe resting on a raised tie bar. Measurements taken correctly in the major tread grooves around the tire are all at least 5/32 inch. No other defects are found. Which entry accurately documents the tire's compliance with the federal tread-depth requirement?
Correct answer: A - Meets the front-tire requirement; a tie-bar reading does not count.
A refinished truck wheel returns with loose nuts shortly after installation. The correct hardware was tightened to specification with a calibrated torque wrench, but inspection finds thick paint crushed and displaced between the wheel and hub mounting faces. What best explains why correct installation torque did not prevent loosening?
Correct answer: B - The coating settled out of the joint, reducing stud tension and clamping force.
One stud is broken on a ten-stud hub carrying an Alcoa hub-piloted wheel. Inspection finds no damage in the other nine studs, and the vehicle and stud manufacturers specify no additional replacements. Under Alcoa's wheel-service instructions, which replacement pattern is the minimum required?
Correct answer: C - Replace the broken stud and its immediate neighbor on each side.
Before demounting a fully deflated tire, a technician examines a 19.5-inch aluminum disc wheel. Unlike a symmetrical wheel, this wheel has a shorter bead-seat ledge between the drop-center well and the flange on the disc side. From which side should the tire be demounted and subsequently mounted?
Correct answer: B - The disc side, following the wheel's actual short-ledge geometry.
The beads of a steel-cord radial truck tire have seated during inflation in a restraining device. A bulge then develops in the upper sidewall, accompanied by crackling sounds. The valve core is out, and the inflation line permits remote deflation. Everyone is outside the trajectory. What should the technician do immediately?
Correct answer: A - Stop inflation, stay clear, and remotely deflate the tire completely.
A correctly balanced truck tire/wheel assembly still produces a once-per-revolution hop. The technician marks the greatest radial run-out point on both the tire and wheel, completely deflates the tire, and rotates it 180 degrees relative to the wheel. After correct reinflation, the bead witness lines are even and the assembly is accurately centered on the measuring fixture. The high point follows the tire mark rather than the wheel mark, with essentially unchanged run-out. The findings primarily implicate:
Correct answer: D - The tire's out-of-round geometry.
A demounted 11R22.5 Load Range H tire has one isolated puncture in the central crown. After preparation, the injury measures 5/16 inch across. Internal inspection shows no run-low damage, separation, or overlapping repair. The tire manufacturer permits repairs within USTMA's commercial-truck puncture limits. How should this injury be classified and repaired?
Correct answer: B - As a puncture repair, with an approved injury-filling stem and innerliner-sealing patch.
An 11R22.5 Load Range H dual pair supports a measured 11,400 lb, shared equally by two properly matched tires. The applicable load table gives these capacities PER TIRE: 95 psi cold: 5,730 lb single / 5,415 lb dual 100 psi cold: 5,950 lb single / 5,625 lb dual 105 psi cold: 6,175 lb single / 5,840 lb dual 110 psi cold: 6,320 lb single / 5,895 lb dual All other equipment ratings are adequate. What is the lowest listed cold pressure that supports this load in dual service?
Correct answer: C - 105 psi, using the dual-tire capacity for each tire's share of the load.
The CCTS exam also covers these domains. Drill them in the full free practice test:
The full bank has 1,020 more CCTS questions with explanations.
Continue in the free practice test →
View plans