EXAM QUESTIONS WITH CORRECT
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What device cannot be used when there is a health hazard ? - ANSWER ✓ DCA
An AVB and PVB can be used in health hazard situations , if the following
conditions are not present : - ANSWER ✓ Backpressure,There is pump
downstream and Chemicals added
An Atmospheric Vacuum Breaker? - ANSWER ✓ Has to be installed 6 " higher
than the highest head or outlet in the retracted position , will not handle constant
pressure , and will stop backsiphonage
What is the unwanted reversal of water flow in an irrigation system ? - ANSWER
✓ Backflow
A cross connection is any actual or potential connection between a potable water
supply and : - ANSWER ✓ Any source that has the possibility to introduce
polluted or contaminated water back into the potable water that is supplying it .
Backsiphonage is caused by : - ANSWER ✓ Negative or sub - atmospheric
pressure
Backsiphonage can be caused by : - ANSWER ✓ A break in the city, main and the
fire department, using water from the city fire hydrant to put out a fire