A technician needs a quick approximate measurement of a machined slot in workshop practice. Which task best represents the use of a steel rule?
Checking slot width against a given dimension
A steel rule is a flat graduated scale used for direct linear measurement, reading a length quickly in millimetres or inches to an approximate accuracy.
The question asks which task actually uses that measuring function, so the right choice must involve reading a dimension rather than marking or guiding.
Laying the rule across a machined slot lets the technician read the slot width straight off the scale and compare it with the size called for on the drawing.
This is exactly the quick, approximate check the steel rule is intended for, so checking slot width against a given dimension fits its purpose.
Comparing internal bore sizes needs an inside caliper or a bore gauge transferred to a scale, because a rule cannot reach squarely inside a round hole.
Marking reference positions is done with a scriber or punch, and guiding straight layout lines calls for a straight edge; both use the rule's edge, not its graduations, so neither is a measuring task.
Hence, the answer is Checking slot width against a given dimension.
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