Maintenance Technician Practice Test 2025 - Free Maintenance Technician Practice Questions and Prep Guide

Question: 1 / 400

Define "thermal expansion" in the context of material maintenance.

The increase in elasticity of materials when heated

The decrease in size of materials when cooled

The increase in size of materials when heated

Thermal expansion refers to the tendency of materials to change in size, typically expanding when subjected to an increase in temperature. As materials are heated, the kinetic energy of their atoms or molecules increases, resulting in greater spacing between them. This causes the overall dimensions of the material to enlarge, which is particularly relevant in various maintenance contexts, such as ensuring that mechanical components fit together properly under operational temperatures.

Understanding thermal expansion is crucial for maintenance technicians, as it helps in anticipating issues such as misalignment, wear, or failure in systems where temperature variations are commonplace. For example, metal components in engines or pipelines need to accommodate for thermal expansion to avoid stress and potential damage.

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The property of materials to remain constant in size

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