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These 10 free CTS questions are organized by exam domain, so you can see how each part of the Commercial Tire Service - 300 Level blueprint is tested. Reveal the answer and explanation under each question.
Halfway through a roadside tire change in hot weather, a worker stumbles, gives confused answers, and slurs words while still sweating heavily. A coworker has moved the worker into shade away from traffic. What immediate care is indicated?
Correct answer: B - Call 911, remain with the worker, and begin rapid cooling while help is coming.
The service description on a truck tire is 144/141L. The tire is approved for the intended dual fitment and will operate at the cold pressure corresponding to its stated rating. Which load-index interpretation applies to this installation?
Correct answer: D - Load index 141 gives the capacity of each tire in dual service.
A replacement disc wheel slips over the studs of a truck's hub-piloted wheel system. The bolt circle matches, but the replacement has spherical stud-hole seats intended for ball-seat nuts. How should the technician resolve this mismatch?
Correct answer: A - Obtain a compatible hub-piloted wheel and use the specified flange nuts.
Three reflective triangles are being placed for a disabled tractor-trailer on the shoulder of a straight rural divided highway. Visibility is unobstructed, and the hazard flashers are on. One triangle is already at the traffic side within 10 feet of the rear. Where do the other two belong under the federal rule?
Correct answer: D - About 100 and 200 feet toward traffic approaching the vehicle.
Several nuts on a recently installed dual-wheel assembly turn before reaching the specified torque at the first recheck. Wrench calibration, fastener condition, and the specified lubrication are verified. Thick paint and rust scale remain between the mating faces. Which correction addresses the likely cause of the lost clamping force?
Correct answer: C - Clean the mating faces, inspect, and reinstall using the specified procedure.
On an Accuride stud-piloted dual-wheel assembly, the outer cap nuts are at their specified torque. The inner cap nuts are also due for a torque recheck. Which procedure checks the inner retention correctly?
Correct answer: A - Loosen the relevant outer nuts, check the inner cap nuts, then retighten the outer nuts to specification.
An Accuride rear demountable-rim installation uses heel-less clamps. The rims, spacer, and clamps are the correct parts, all seating checks are satisfactory, and the specified torque has been reached. A gap remains between each clamp and the spoke wheel. What does this condition call for?
Correct answer: A - Keep the gap as designed and finish the remaining installation checks.
While manually demounting a completely deflated truck tire, a technician works from the correct short side with the bead properly lubricated and the TPMS sensor located and protected. The tire iron becomes difficult to move as the first bead is lifted; the opposite section of that bead is still on the bead seat. Which adjustment supplies the missing clearance?
Correct answer: D - Move the opposite bead section into the drop center without contacting the sensor.
A demounted Load Range G radial truck tire has an 8-mm crown puncture with an injury channel 20 degrees from the local perpendicular through the tread. Inspection finds no other damage, and the tire manufacturer permits repair. The shop follows REMA TIP TOP's v9 procedure, which calls for a two-piece repair above 15 degrees. Which repair meets the injury's requirements?
Correct answer: B - An approved stem to fill the injury and a separate innerliner patch.
An axle fitted with 11R22.5 Load Range G MICHELIN X LINE ENERGY Z tires in duals carries 9,800 lb at the left axle end and 10,900 lb at the right. Each pair is properly matched and shares its end's load equally. The applicable Michelin table lists capacities for a complete dual axle of FOUR tires: 20,820 lb at 90 psi; 21,660 lb at 95 psi; 22,500 lb at 100 psi; and 23,360 lb at 105 psi. All component ratings and vehicle instructions permit these pressures. If one cold pressure is used throughout the axle, what is the lowest listed pressure that provides adequate capacity at every tire?
Correct answer: C - 100 psi
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