The distilled water tank has been determined to be 75% full. The tank connection to the pneumercator has been disconnected for a maintenance check. If the pneumercator operates correctly, the gage should indicate __________.
• How a pneumercator (air-operated level gage) senses liquid level when the sensing line is connected vs. disconnected • What happens to air pressure in the sensing line if it is no longer exposed to the liquid in the tank • The relationship between tank level and indicated level on a correctly operating pneumercator
• If the tank is truly 75% full but the sensing line is disconnected from the tank, what is the gage actually measuring? Liquid level, or something else? • When the line is open to the atmosphere (not to the tank), what pressure condition exists in the line compared to when it is bubbling into the liquid? • Which option best matches what a properly working, but now isolated, air-bubbler type instrument would show on its scale?
• Confirm that a correctly operating pneumercator depends on back pressure from air bubbling at the bottom of the tank to read level • Check which choice corresponds to the gage seeing only atmospheric pressure instead of hydrostatic pressure from the liquid • Eliminate any choice that assumes the instrument is still sensing the actual tank level after being disconnected
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