Recreational Vehicle (RV) Technician Practice Test

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Prepare for the RV Technician Test. Use flashcards and multiple-choice questions with hints and explanations. Ensure your success!

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What feature do newer overfilling prevention devices for tanks have that restricts the inlet fill capacity?

Ball valve
Piston assembly and valve
Pressure regulator
Safety switch

The correct answer is: Piston assembly and valve

Newer overfilling prevention devices for tanks utilize a piston assembly and valve to restrict the inlet fill capacity. This technological approach allows for precise control over the flow of liquid into the tank. The piston assembly detects when the tank reaches a certain level, blocking further flow and thereby preventing overfilling. This system is particularly effective in addressing concerns about spills and leaks, which can occur when a tank is overfilled. Other options, while they serve important functions in various systems, do not specifically offer the same level of fill restriction as the piston assembly and valve. A ball valve simply opens or closes the flow and does not provide the same level of automatic control or detection. A pressure regulator manages the pressure within the system, but it does not inherently prevent overfilling. A safety switch could serve a protective function but is not directly related to controlling the fill capacity of a tank. Thus, the use of a piston assembly and valve is uniquely suited to the role of preventing overfilling while allowing effective tank management.