Visual Testing (VT) Practice Exam

What kind of component support allows normal thermal movement but restrains movement during a seismic event?

1. Hanger

2. Support

3. Snubber

4. Restraint

The correct answer is: Snubber

The correct answer is the snubber, which is a specialized component designed to handle specific mechanical requirements in structural and mechanical systems. Snubbers function to allow normal thermal expansion and contraction of components under regular operating conditions. However, during a seismic event, they provide a restraining effect that limits excessive movement, which is crucial for maintaining structural integrity and preventing damage. Snubbers typically consist of a combination of materials that offer both flexibility and rigidity, enabling them to absorb and dissipate energy during seismic activity while still allowing for the necessary freedom of movement under normal conditions. This dual capability is essential for systems that may experience significant temperature variations, ensuring that they function effectively without compromising safety during events like earthquakes. Hangers, supports, and restraints serve different roles in the overall system. Hangers primarily suspend components, supports provide stability, and restraints limit movements but may not have the same dual functionality in thermal and seismic scenarios as snubbers do. Understanding the correct application of snubbers is critical for engineers and designers aiming to enhance the resilience of structures in seismic-prone areas.