Oilers/Plant Tenders (HHC) Civil Service Practice Exam

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the Oilers/Plant Tenders Exam with our comprehensive quiz. Utilize flashcards and multiple choice questions with hints and explanations to excel in your civil service test. Start your preparation now!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

Which type of valve is characterized by being either fully opened or closed?

Ball valve
Gate valve
Check valve
Butterfly valve

The correct answer is: Gate valve

The gate valve is designed to be either fully opened or fully closed, making it ideal for applications where a straight-line flow of fluid is required with minimal pressure drop. Unlike other types of valves, it does not have throttling capability; when a gate valve is partially open, it can cause turbulence and wear over time. Therefore, its primary function is to completely stop or allow flow, ensuring effective isolation of sections of a pipeline system. Ball valves, while they also offer an on/off function, can often provide better sealing capabilities and quicker operation compared to gate valves. Check valves are designed to allow flow in one direction only and prevent backflow, which is a distinct purpose that does not align with the fully open or closed requirement. Butterfly valves, while capable of being fully opened or closed, are typically used for regulating flow and can be used for throttling as well, which differentiates them from the function of a gate valve.