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 ETS questions are organized by exam domain, so you can see how each part of the Basic Earthmover Tire Service blueprint is tested. Reveal the answer and explanation under each question.
After a haul truck brake fire is extinguished, the heat-affected tire shows no flame or visible smoke. A crew member proposes approaching the valve to release any remaining pressure. What is the appropriate immediate response?
Correct answer: A - Keep personnel clear and activate the site's emergency procedure for heat-affected tires.
At the start of a shift, a loader tire was set to its specified cold pressure of 80 psi. After normal operation it reads 92 psi on the same verified gauge. Load is unchanged, and inspection finds no abnormal heat or damage. The operator requests an immediate adjustment back to 80 psi. How should the technician respond?
Correct answer: D - Leave the warm pressure unchanged and recheck it cold before making a pressure correction.
The replacement specified for a loader is marked L-5S. What should that marking tell the receiving technician about the tread?
Correct answer: D - Loader/dozer service with an extra-deep smooth tread.
For a planned OTR lift, the crane's chart lists gross capacities of 6,000 lb at 10 ft, 4,500 lb at 15 ft, and 3,000 lb at 20 ft. The tire weighs 2,800 lb, its rim 700 lb, and the suspended lifting fixture and rigging 250 lb. All other setup and lifting requirements are satisfied. Which is the greatest listed radius permitted by this chart for the complete load?
Correct answer: A - 15 ft.
An articulated loader is prepared for tire service: the parking brake is applied, the tires are chocked, the engine is isolated, the bucket is on the ground, and the raised axle is mechanically supported. The articulation lock has not been installed. Before anyone enters the frame-joint area, identify the movement these measures have not positively restrained.
Correct answer: C - Pivoting of the front frame relative to the rear frame.
While demounting a fully deflated grader tire from a one-piece rim still on the machine, a technician finds that the last section of the first bead requires excessive lever force. The correct tire size, lubricant, and narrow-ledge working side have been confirmed. The bead opposite the tool is still on its seat. What change addresses the cause?
Correct answer: B - Move the section of bead opposite the tool into the rim's drop center.
An undamaged, intact three-piece assembly remains on a loader. Its verified cold pressure is 88 psi against a recommended 100 psi. Records establish that it has not been operated at 80 psi or below, and no rim components have been disturbed. Which recommendation correctly applies OSHA 29 CFR 1910.177 to this pressure correction?
Correct answer: A - Restore pressure remotely on the machine, with everyone outside the trajectory.
During a controlled leak check of an installed five-piece tubeless assembly, bubbles form at the joint between the bead seat band and rim base. No bubbles appear at the valve or tire-to-rim bead interfaces. The lock ring is correctly engaged. Which fault best fits this leak pattern?
Correct answer: C - An O-ring that is damaged or displaced at the sealing joint.
A bead expander is being used while mounting a tubeless tire on a loose one-piece rim. With the valve core still removed, the beads reach the rim ledges and the assembly becomes airtight. Under OSHA 29 CFR 1910.177, when should the expander be removed?
Correct answer: D - As soon as the seal forms, before the valve core is installed.
The specified final torque for a wheel installation is 500 N·m on clean, dry threads. Before any tightening, a technician applies anti-seize to the new, undamaged studs. No lubricated-thread torque or alternative procedure is provided. Which preparation allows the stated tightening procedure to be used?
Correct answer: B - Clean off the anti-seize by the approved method and use the specified dry-thread torque.
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