Certified Maintenance and Reliability Technician (CMRT) Practice Test 2025 - Free CMRT Practice Questions and Study Guide

Question: 1 / 400

How many millimeters are in one inch?

25.0 mm

25.4 mm

One inch is defined as exactly 25.4 millimeters. This conversion factor is established through the metric system and is widely used in various fields, including engineering, manufacturing, and scientific research. Understanding this conversion is crucial as it allows for precise measurements and calculations when switching between metric and imperial units.

The significance of the number 25.4 millimeters per inch is that it ensures accuracy in applications where precise dimensions are necessary. It is important to note that while there are approximate conversions, the exact value of 25.4 mm provides the standard used in professional and technical contexts. This precision is particularly important in settings such as mechanical design, where even minor discrepancies can lead to significant issues in functionality or safety.

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20.0 mm

30.4 mm

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