Intro to Millwright Practice Exam

Disable ads (and more) with a membership for a one time $4.99 payment

Prepare for the Millwright Exam with a comprehensive set of flashcards and multiple-choice questions. Each question includes hints and explanations. Get ready to succeed on your exam!

Practice this question and more.

What type of elastic material is an O-Ring typically made from?

Plastic
Rubber
Steel
Silicone

The correct answer is: Rubber

O-Rings are commonly made from rubber due to its excellent elasticity and ability to provide a tight seal in various applications. Rubber can easily stretch and return to its original shape, which is essential for creating a proper seal when the O-Ring is compressed between two surfaces. This material also exhibits good resistance to compression set, allowing it to maintain its sealing properties over time. While silicone is also a type of rubber and is used for specific O-Ring applications due to its high temperature tolerance and flexibility, the generic term “rubber” encompasses a broader range of formulations that are traditionally used for O-Rings, including nitrile, neoprene, and fluorocarbon rubbers. Thus, rubber is the most accurate and commonly accepted answer regarding the material composition of O-Rings.