25. The auxiliary oil-fired fire-tube steam boiler fitted on your towing vessel is equipped with a water level electrode assembly similar to that shown in the illustration. Under normal circumstances, what would be considered a normal operating water level (NOWL)

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anywhere from the bottom (tip) of the electrode labeled "b" to the bottom (tip) of the electrode labeled "c".

25. The auxiliary oil-fired fire-tube steam boiler fitted on your towing vessel is equipped with a water level electrode assembly similar to that shown in the illustration. Under normal circumstances, what would be considered a normal operating water level (NOWL)

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