Analysis
This puzzle continues
to push students to read data presentations that have multiple plots. The graphic has three
common data response
shapes and each has its own mathematical model (formula, equation). The puzzle story emphasizes the slope concept.
The performance of
Value
PF-137 follows
the classic “y= mx + b” linear model. The presence (absence) of a constant
slope value is the point to emphasize with students. As the valve is opened a "linear"
response to flow will occur. By contrast,
the performance of Valve PF-121 is not linear. If appropriate, the equation for this curve
can be discussed with your class. However, it is visually clear that initially opening
the valve a lot (40% for example) does not allow 40% of full fluid flow through
the valve to occur. Since the technician
wants to have a low flow of acid initially be mixed with the water in the tank, Valve PF-121 only allows about 10% of full
flow when the valve is 40% open. Thus, from valve selection shown below, the
tech would pick Valve PF-121.
Question: The Tech installed Valve PF-137. Yes
or NO
Answer: NO
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