While allowing the sand to fill the test hole, funnel, and base plate, at what stage should the valve be closed?
Understand the Problem
The question is asking about the appropriate stage to close the valve while sand is filling a test hole, funnel, and base plate. It provides multiple-choice options regarding when to close the valve based on elapsed time or the behavior of the sand flow.
Answer
Close the valve when the sand stops flowing.
The valve should be closed when the sand stops flowing.
Answer for screen readers
The valve should be closed when the sand stops flowing.
More Information
The valve is closed when the sand stops flowing to ensure that the test conditions are stable and no further sand can affect the measurements.
Tips
A common mistake is closing the valve too early. Ensure that the sand flow has completely ceased before closing the valve.
Sources
- Archived document on sand flow procedure - ftp.dot.state.tx.us
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