Recreational Vehicle (RV) Technician Practice Test

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What is the purpose of a hydrometer?

Measuring voltage
Measuring resistance
Measuring specific gravity in electrolytes
Checking for electrical continuity

The correct answer is: Measuring specific gravity in electrolytes

The hydrometer is designed to measure the specific gravity of liquids, particularly in electrolytes such as battery acid. This measurement helps technicians evaluate the state of charge of lead-acid batteries by determining the density of the electrolyte compared to pure water. By understanding the specific gravity, one can assess the amount of lead sulfate present in the battery, which indicates how fully charged or depleted the battery is. High specific gravity readings typically suggest a fully charged battery, while lower readings indicate a discharged state. Other options are unrelated to the function of a hydrometer. For example, measuring voltage pertains to tools like voltmeters, while measuring resistance requires ohmmeters. Additionally, checking for electrical continuity involves the use of continuity testers or multimeters, not hydrometers. Each of these devices has a distinct purpose, highlighting the specialized nature of the hydrometer in fluid density measurement.