Question 293General Subjects - Assistant Engineer
70% to passIn the illustration shown, what is the proper description of the hole represented by "C"? Illustration GS-0015
ACounter bored
BCountersunk
CCounter drilled
DSpot faced
AI Explanation
The correct answer is A) Counter bored. A counter bore is a type of hole that is enlarged at one end, creating a stepped profile. This is often used to accommodate the head of a fastener, like a bolt or screw, so that it sits flush with the surface. The other answer choices are incorrect: B) Countersunk refers to a hole that is tapered at one end, rather than enlarged. C) Counter drilled is not a standard term, and does not accurately describe the illustrated feature. D) Spot faced refers to creating a flat surface around a hole, rather than enlarging the hole itself.
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