Exam (elaborations)
Backflow Prevention Assembly Tester Training.
- Module
- Biology 101
- Institution
- Biology 101
Backflow Prevention Assembly Tester Training.
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Backflow Prevention Assembly TesterTraining
What is the difference between CV 1 and CV 2 on a double CV assembly - ANS-The
two CV operate the same
In a perfect vacuum, water can be drawn up a column__________feet. - ANS-33.9
Which of the following is considered to be a chemical contaminant? - ANS-Arsenic
Which of the following is considered to be a biological health hazard? - ANS-Giardia
What type of assembly has two internally spring- loaded CV, two shut- off valves, and
four test cocks? - ANS-Double Check
Which of the following is the most suitable protection when directly connecting potable
water supply lines to sewerage systems or to radioactive sources? - ANS-Air Gap
A Bypass of a Backflow prevention assembly may be permitted only if the assembly in
the bypass: - ANS-Is the same type
What Federal Law made water purveyors responsible for water quality all the way to the
customers tap? - ANS-Safe Drinking Water Act Amendment of 1986
If a column of water is exerting a pressure of 50 psi, how high must the water be inside
the column? - ANS-115.5ft
As the velocity of water increases, pressure: - ANS-Decreases
Atmospheric pressure at sea level is _____psi - ANS-14.7
A water supply other than the purveyors approved supply that is available to a premise
is called: - ANS-Auxiliary Water Supply
When testing a DCDA the mainline and bypass assemblies should be a tested minimum
of ________ months. - ANS-12
How can backsiphonage action be broken - ANS-Air Gap
, What single difficult to regulate item is more commonly associated with cross
connections, specifically through backsiphonage? - ANS-Garden Hose
Which device must have proper drainage provided for all enclosures? - ANS-Reduced
pressure Backflow preventer
The appropriate height for an Air Gap is : - ANS-2x pipe size Diameter above flood rim
of the receiving vessel, minimum of 1"
While testing CV 1 on a dc, water recedes from the sight tube attached to TC3. The
gauge should be moved to the centerline of the assembly and the static pressure drop
across CV 1 should be recorded. What other information should be recorded? -
ANS-CV2 is leaking and shutoff valve 2 is leaking
At what point is the relief valve in a RP required to open? - ANS-2.0psid
What is the minimum spring tension recommended on CV1 in a RPZ? - ANS-3 psi
greater than the tension recommended on CV1 in a RPZ
Which device protects against back pressure and backsiphonage? - ANS-Reduced
pressure Backflow preventer
While testing the air inlet valve on a spill proof vacuum breaker, the high side bleed
needle valve may need to be opened more than 1/4 turn in order to allow the air inlet to
open? What is the likely cause? - ANS-Leaking shutoff valve #1
According to USC, what is the correct height for installing a RPZ? - ANS-12 inches
above grade, but no more than 36inches
What is the correct height to install a PVB? - ANS-12inches above the highest
downstream point
What company or agency is responsible for testing and approving all Backflow
prevention assemblies in the US? - ANS-Foundation for Cross Connection Control &
Hydraulic Research
Backflow Prevention assemblies are often installed in parallel in order to: -
ANS-Maintain service during testing and repairs
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