Recreational Vehicle (RV) Technician Practice Test

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Prepare for the RV Technician Test with our quiz. Utilize flashcards and multiple-choice questions, complete with hints and explanations. Achieve success in your exam!

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What is referred to as the primary valve in a DOT cylinder?

Relief valve
Service valve
Fill valve
Vapor withdrawal tube

The correct answer is: Service valve

The primary valve in a Department of Transportation (DOT) cylinder is known as the service valve. This valve is crucial for controlling the flow of gas from the cylinder during usage. It allows the operator to manage the release of gas, ensuring safety and efficiency while using the cylinder's contents. The service valve is typically located at the top of the cylinder and serves as the main access point for regulating gas supply. The other components mentioned, while important for the overall functionality of the gas cylinder, serve different purposes. The relief valve is designed to release excess pressure to prevent cylinder ruptures, while the fill valve is used during the process of refilling the cylinder. The vapor withdrawal tube facilitates the withdrawal of gas from the cylinder but does not serve as the primary control point. Understanding the roles of these different valves reinforces the importance of the service valve in handling gas safely.