Intro to Millwright Practice Exam

What is the primary feature of a non-compressible gasket?

1. Flexibility

2. Durability

3. Resistance to high temperatures

4. Inability to seal

The correct answer is: Inability to seal

The primary feature of a non-compressible gasket is its inability to seal effectively when compressed. Non-compressible gaskets are typically made of materials that do not deform under pressure, which means they do not create the necessary tight seal against surfaces that softer, compressible gaskets do. In practical terms, when a non-compressible gasket is installed, it cannot fill the gaps between the mating surfaces because it does not change shape. This characteristic limits its effectiveness in applications where a tight seal is required to prevent leaks of fluids or gases. The other choices, such as flexibility, durability, and resistance to high temperatures, may describe attributes of certain gaskets, but they do not accurately reflect the defining characteristic of non-compressible gaskets. Flexibility implies a degree of deformation, while durability and temperature resistance, though important for many gasket applications, do not capture the primary function that distinguishes a non-compressible gasket from others.