NCCER Millwright Practice Exam 2025 - Free Millwright Practice Questions and Study Guide

Question: 1 / 400

Which instrument is specifically used to measure the angular displacement of a shaft?

A protractor

An angular gauge

The instrument used specifically to measure the angular displacement of a shaft is an angular gauge. Angular gauges are designed to provide precise measurements of angle changes, making them ideal for applications in machinery and alignment tasks where angular positioning is crucial.

In the context of millwright work, being able to measure angular displacement accurately can greatly affect how components fit together and function, such as ensuring that shafts are aligned correctly to prevent wear and mechanical failure. The ability to measure angles in both degrees and radians allows for versatile applications in various types of machinery.

While a protractor is a tool for measuring angles, it is typically used in more general, less precise applications than an angular gauge and may not be suitable for the specific needs of measuring shaft displacement in a professional setting. A tachometer measures rotational speed rather than angular displacement, making it irrelevant to this question. Calipers are used for measuring lengths and diameters, not angles, and therefore do not relate to angular measurements. This reinforces why the angular gauge is the correct instrument for measuring angular displacement of a shaft.

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A tachometer

A caliper

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