Intro to Millwright Practice Exam 2025 – Comprehensive All-In-One Guide for Exam Success!

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What is a "datum line"?

A line used for horizontal measurement

A datum line is a critical reference in various fields, particularly in engineering and construction, as it serves as a baseline for measurements. The primary function of a datum line is to provide a consistent starting point for horizontal measurements. This means that any measurements taken in relation to the datum line can be accurately compared and referenced to maintain uniformity in construction or manufacturing processes. It ensures that levels are maintained across different parts of a project, contributing to structural integrity and design adherence.

While other options may refer to concepts related to guidelines or reference points, they do not specifically capture the definition and function that a datum line provides in the context of measurement. Therefore, the choice highlighting the function of a datum line as one for horizontal measurement precisely aligns with its purpose in technical fields, confirming it as the correct answer.

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A guideline for drawing

A movable reference point

A guideline for vertical measurement

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