Backflow Prevention & Cross-Connection
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Rationales 2026 Q&A | Instant Download
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1. What is the primary purpose of a backflow prevention assembly?
A. To increase water pressure
B. To prevent contamination of the potable water supply
C. To filter debris from water
D. To regulate water temperature
Rationale: The main function of a backflow prevention assembly is to
prevent contaminants from entering the drinking water supply.
2. What type of backflow occurs when water flows from a higher-
pressure zone into a lower-pressure potable water system?
A. Backpressure
B. Backsiphonage
, C. Cross-connection
D. Reverse flow
Rationale: A cross-connection creates a direct path for contaminants
to enter the potable water system when pressure differentials allow
reverse flow.
3. Which device is commonly used to protect against backpressure and
backsiphonage?
A. Pressure-reducing valve
B. Float valve
C. Double check valve assembly
D. Flow restrictor
Rationale: Double check valve assemblies are designed to prevent
both backpressure and backsiphonage in low to medium hazard
situations.
4. Which type of backflow prevention device is required for a high hazard
situation involving toxic chemicals?
A. Atmospheric vacuum breaker
B. Reduced pressure principle assembly (RP)
C. Double check valve assembly
D. Pressure vacuum breaker
Rationale: Reduced pressure principle assemblies provide maximum
protection and are required for high hazard situations.
,5. What does backsiphonage result from?
A. Increase in system pressure
B. Negative or reduced pressure in the supply line
C. Thermal expansion
D. Normal water flow
Rationale: Backsiphonage occurs when there is a vacuum or negative
pressure in the potable water system that draws contaminants back
into it.
6. Where should a pressure vacuum breaker be installed?
A. Above the highest point of usage and downstream of the shutoff
valve
B. Below the water meter
C. At the water main entry
D. In a sewer line
Rationale: Pressure vacuum breakers must be installed above the
highest downstream outlet to prevent backsiphonage.
7. How often should a reduced pressure principle assembly be tested?
A. Monthly
B. Annually
C. Every five years
D. Only at installation
Rationale: Annual testing is required to ensure RP assemblies
maintain proper protection.
, 8. Which of the following is a cross-connection?
A. Two water meters on the same line
B. A hose submerged in a bucket containing detergent
C. A closed-loop irrigation system
D. A potable water faucet
Rationale: A cross-connection is any physical connection between a
potable water system and a source of contamination.
9. What is the difference between a double check valve assembly and a
reduced pressure assembly?
A. Installation location
B. Level of protection provided
C. Material type
D. Flow capacity
Rationale: RP assemblies provide higher protection (required for high
hazard), while double check valves are used for low to medium
hazards.
10. Which agency typically regulates backflow prevention
requirements?
A. OSHA
B. State or local health department / water utility
C. EPA
D. CDC
Control Exam Practice Questions And
Correct Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant Download
1. What is the primary purpose of a backflow prevention assembly?
A. To increase water pressure
B. To prevent contamination of the potable water supply
C. To filter debris from water
D. To regulate water temperature
Rationale: The main function of a backflow prevention assembly is to
prevent contaminants from entering the drinking water supply.
2. What type of backflow occurs when water flows from a higher-
pressure zone into a lower-pressure potable water system?
A. Backpressure
B. Backsiphonage
, C. Cross-connection
D. Reverse flow
Rationale: A cross-connection creates a direct path for contaminants
to enter the potable water system when pressure differentials allow
reverse flow.
3. Which device is commonly used to protect against backpressure and
backsiphonage?
A. Pressure-reducing valve
B. Float valve
C. Double check valve assembly
D. Flow restrictor
Rationale: Double check valve assemblies are designed to prevent
both backpressure and backsiphonage in low to medium hazard
situations.
4. Which type of backflow prevention device is required for a high hazard
situation involving toxic chemicals?
A. Atmospheric vacuum breaker
B. Reduced pressure principle assembly (RP)
C. Double check valve assembly
D. Pressure vacuum breaker
Rationale: Reduced pressure principle assemblies provide maximum
protection and are required for high hazard situations.
,5. What does backsiphonage result from?
A. Increase in system pressure
B. Negative or reduced pressure in the supply line
C. Thermal expansion
D. Normal water flow
Rationale: Backsiphonage occurs when there is a vacuum or negative
pressure in the potable water system that draws contaminants back
into it.
6. Where should a pressure vacuum breaker be installed?
A. Above the highest point of usage and downstream of the shutoff
valve
B. Below the water meter
C. At the water main entry
D. In a sewer line
Rationale: Pressure vacuum breakers must be installed above the
highest downstream outlet to prevent backsiphonage.
7. How often should a reduced pressure principle assembly be tested?
A. Monthly
B. Annually
C. Every five years
D. Only at installation
Rationale: Annual testing is required to ensure RP assemblies
maintain proper protection.
, 8. Which of the following is a cross-connection?
A. Two water meters on the same line
B. A hose submerged in a bucket containing detergent
C. A closed-loop irrigation system
D. A potable water faucet
Rationale: A cross-connection is any physical connection between a
potable water system and a source of contamination.
9. What is the difference between a double check valve assembly and a
reduced pressure assembly?
A. Installation location
B. Level of protection provided
C. Material type
D. Flow capacity
Rationale: RP assemblies provide higher protection (required for high
hazard), while double check valves are used for low to medium
hazards.
10. Which agency typically regulates backflow prevention
requirements?
A. OSHA
B. State or local health department / water utility
C. EPA
D. CDC
