BACKFLOW EXAM QUESTIONS AND
ANSWERS
Pressure at bottom of tank, 10' deep, how much PSI? - Correct Answers -4.3
NOT isolation protection - Correct Answers -Double Check installed at the service
connection of warehouse
Convert feet of head to PSI - Correct Answers -Multiply by 0.433
A system with a chemical injector must protect potable system with what? - Correct
Answers -A RP
Atmosphere cannot support a column of water greater than________ feet - Correct
Answers -33.9 feet
The unintentional reversal of flow in a potable water system which may result in
contamination or pollution in the system. - Correct Answers -Backflow
Quality of water that is impaired in respect to taste, odor, or utility; but does not
constitute a health hazard - Correct Answers -Pollutant
Submerged garden hose being used to fill a swimming pool is considered.... - Correct
Answers -Indirect cross-connection
If the check valve springs are interchanged on a Double Check Backflow Prevention
Assembly, the assembly will... - Correct Answers -Not affect the downstream pressure
A double check Backflow prevention assembly can be used on a system with
antifreeze... - Correct Answers -Should never be used
What can be used to test a double check Backflow prevention assembly? - Correct
Answers -Differential pressure gauge, duplex gauge, sight tube
A double check detector fire protection Backflow prevention assembly contains 1... -
Correct Answers -Flow meter/indicator
Minimum marking requirements for a backflow prevention assembly - Correct Answers -
Manufacturer's name, type of assembly, size and model #, rated working pressure, and
rated working temperature
, For containment protection in a high hazard situation, what is the minimum required
protection? - Correct Answers -Reduced Pressure Principle Backflow Preventer
Atmospheric pressure at sea level - Correct Answers -14.7 psi
Minimum backflow protection on service line in a single family home - Correct Answers -
According to local jurisdiction
The following absolute pressure could cause backsiphonage in a hydraulic system
(distribution system) at sea level - Correct Answers -10.5 psia
Bernoulli's Principle refers to... - Correct Answers -Venturi effect
First step to testing a backflow prevention assembly - Correct Answers -Inform the user
the water will be shut off
Minimum device for protecting potable water supply to a low pressure residential water
boiler that has not been treated with chemicals - Correct Answers -Backflow preventer
with intermediate atmospheric vent
Used to control thermal expansion - Correct Answers -Thermal expansion tank
NOT backflow prevention method - Correct Answers -Swing connection
Backflow prevention device - Correct Answers -Atmospheric Type Vacuum Breaker
Backflow protection for a closed loop piping system with glycol - Correct Answers -
Reduced Pressure Principle Assembly
Most common backflow preventer at a residential meter - Correct Answers -Dual Check
Valve Type Backflow Preventer
Atmospheric Type Vacuum Breakers protect against - Correct Answers -Backsiphonage
- High or low hazard conditions
Waterborne illness from cross-connections - Correct Answers -Typhoid, cholera,
giardiasis
ALL backflow assemblies are required to have... - Correct Answers -A check, a test
cock, and isolation valves
For companies who use a contaminated auxiliary water supply for fire protection, the
water service connection must be protected with a.... - Correct Answers -Reduced
Pressure Principle Backflow Preventer
ANSWERS
Pressure at bottom of tank, 10' deep, how much PSI? - Correct Answers -4.3
NOT isolation protection - Correct Answers -Double Check installed at the service
connection of warehouse
Convert feet of head to PSI - Correct Answers -Multiply by 0.433
A system with a chemical injector must protect potable system with what? - Correct
Answers -A RP
Atmosphere cannot support a column of water greater than________ feet - Correct
Answers -33.9 feet
The unintentional reversal of flow in a potable water system which may result in
contamination or pollution in the system. - Correct Answers -Backflow
Quality of water that is impaired in respect to taste, odor, or utility; but does not
constitute a health hazard - Correct Answers -Pollutant
Submerged garden hose being used to fill a swimming pool is considered.... - Correct
Answers -Indirect cross-connection
If the check valve springs are interchanged on a Double Check Backflow Prevention
Assembly, the assembly will... - Correct Answers -Not affect the downstream pressure
A double check Backflow prevention assembly can be used on a system with
antifreeze... - Correct Answers -Should never be used
What can be used to test a double check Backflow prevention assembly? - Correct
Answers -Differential pressure gauge, duplex gauge, sight tube
A double check detector fire protection Backflow prevention assembly contains 1... -
Correct Answers -Flow meter/indicator
Minimum marking requirements for a backflow prevention assembly - Correct Answers -
Manufacturer's name, type of assembly, size and model #, rated working pressure, and
rated working temperature
, For containment protection in a high hazard situation, what is the minimum required
protection? - Correct Answers -Reduced Pressure Principle Backflow Preventer
Atmospheric pressure at sea level - Correct Answers -14.7 psi
Minimum backflow protection on service line in a single family home - Correct Answers -
According to local jurisdiction
The following absolute pressure could cause backsiphonage in a hydraulic system
(distribution system) at sea level - Correct Answers -10.5 psia
Bernoulli's Principle refers to... - Correct Answers -Venturi effect
First step to testing a backflow prevention assembly - Correct Answers -Inform the user
the water will be shut off
Minimum device for protecting potable water supply to a low pressure residential water
boiler that has not been treated with chemicals - Correct Answers -Backflow preventer
with intermediate atmospheric vent
Used to control thermal expansion - Correct Answers -Thermal expansion tank
NOT backflow prevention method - Correct Answers -Swing connection
Backflow prevention device - Correct Answers -Atmospheric Type Vacuum Breaker
Backflow protection for a closed loop piping system with glycol - Correct Answers -
Reduced Pressure Principle Assembly
Most common backflow preventer at a residential meter - Correct Answers -Dual Check
Valve Type Backflow Preventer
Atmospheric Type Vacuum Breakers protect against - Correct Answers -Backsiphonage
- High or low hazard conditions
Waterborne illness from cross-connections - Correct Answers -Typhoid, cholera,
giardiasis
ALL backflow assemblies are required to have... - Correct Answers -A check, a test
cock, and isolation valves
For companies who use a contaminated auxiliary water supply for fire protection, the
water service connection must be protected with a.... - Correct Answers -Reduced
Pressure Principle Backflow Preventer
