Engine General (Supplementary) USCG Question #811 (Set 16)

A 'centerline' depicted in a drawing or blueprint is represented by which of the figures shown in the illustration? GS-0031

USCG Exam Illustration GS-0031
USCG Examination Diagram: Illustration GS-0031
Official USCG Answer & Rule Citation

Correct Answer: Option B — E

Centerlines are represented by alternating long and short dashes, serving to define the axis of symmetry for circular or cylindrical features. Proper identification of these lines is crucial for engineers to accurately interpret blueprints and perform precise measurements during the maintenance of shipboard mechanical systems.

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