BACKFLOW PREVENTION PRACTICE TEST 2026 UPDATED QUESTIONS WITH DETAILED ANSWERS

BACKFLOW PREVENTION PRACTICE TEST
2026 UPDATED QUESTIONS WITH
DETAILED ANSWERS

●● Potential Cross-Connection. Answer: Something must be done to
complete the connection. An example would be a hose connected to a
spigot.


●● Backflow. Answer: The undesirable reversal of flow of water, or
mixtures of water and other substances, into the potable water supply
distribution system.


●● Pressure. Answer: Force (lbs) exerted over a unit area (square inch)


●● Psi. Answer: Pounds per square inch, used to measure pressure.


●● Pressure Head. Answer: The vertical distance in feet or meters equal
to
pressure (psi) at a specific point.


●● 1 psi =. Answer: 2.31 feet of water


●● 1 ft of water =. Answer: 0.433 psi

, ●● What is the primary factor that determines psi?. Answer:
Height/Elevations (Pressure head)


●● Atmospheric pressure. Answer: The pressure exerted on the earth by
the
atmosphere above it


●● 14.7 psia (pounds per square inch absolute). Answer: Atmospheric
pressure at sea level is


●● Perfect vacuum (0.0 psia). Answer: If there were no air pushing
down on the surface of the earth, there would be no pressure, this is
known as


●● gauge pressure + atmospheric pressure. Answer: Absolute pressure
(psia) =


●● Absolute pressure - atmospheric pressure =. Answer: Gauge pressure
(psi)


●● Gauge pressure. Answer: Zero referenced against ambient air
pressure, so it's
equal to absolute pressure minus atmospheric pressure