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A water gauge glass located 7 feet or more from the operating floor must have what kind of indication of its position?

  1. Audible alarm

  2. Visible indication

  3. Remote control

  4. Digital readout

The correct answer is: Visible indication

In this context, the requirement for a water gauge glass located 7 feet or more from the operating floor is that it must provide a visible indication of its position. This is essential for operators to easily determine the water level within the boiler from a safe distance, ensuring that they can monitor operations without needing to directly assess the gauge glass at a height that may be cumbersome or hazardous. Visible indications such as markings, colored liquid, or other visual indicators allow for quick and clear verification of water levels, which is crucial for maintaining safe operating conditions and preventing issues such as overheating or boiler pressure problems. While options like audible alarms and digital readouts might provide useful information, they do not fulfill the specific requirement for a direct visual assessment of the water gauge glass's contents from a distance, which is particularly important in industrial settings where safety and quick response times are paramount. Remote control could offer operational flexibility, but does not replace the need for an immediate, observable indicator.