Which of the following are true about a Bourdon gauge?
1. It is always used with an adjustable high-pressure reducing valve.
2. It actually senses pressure but is calibrated to display flow.
3. It reads a flow higher than actual if downstream pressure increases.
4. It will register zero flow when the outlet is completely blocked.
a. 1 and 3 only
b. 1, 2, and 3 only
c. 3 and 4 only
d. 2, 3, and 4 only
ANS: B
Because it measures upstream pressure, the gauge registers flow even when the outlet is com-pletely blocked (Figure 40-24).
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