one
Which devices are unsuitable for back-siphonage in high cross-connection hazard situations?
A
Atmospheric vacuum breaker
B
Air gap
C
Reduced pressure zone device
D
Pressure vacuum breaker
A
Atmospheric vacuum breaker
Which of the following is NOT a communicable disease that can be transmitted through contaminated water?
A
Campylobacter
B
Diabetes
C
Salmonella
D
Hepatitis A
B
Diabetes
What is the consequence of changing the type of backflow prevention device during a project?
A
It may require additional paperwork and amendments to the building consent
B
It has no impact on the project timeline
C
It will automatically improve compliance with the Building Code
D
It is encouraged to ensure better performance
A
It may require additional paperwork and amendments to the building consent
What characterizes a low hazard situation?
A
Potential to cause death
B
Potential to injure health
C
Constitutes a nuisance by colour, odour, or taste
D
Contains toxic substances
C
Constitutes a nuisance by colour, odour, or taste
Which of the following is an example of a medium hazard situation?
A
Sluice sinks
B
Fire sprinkler systems not containing toxic water
C
Mortuaries
D
Hairdresser's sinks
B
Fire sprinkler systems not containing toxic water
What is the primary requirement for water intended for human consumption?
A
It must be sourced from a river
B
It must be potable
C
It must be treated with chemicals
D
It must be boiled before use
B
It must be potable
What is the primary function of air gaps in plumbing systems?
A
To prevent backflow
B
To increase water pressure
C
To filter water
D
To heat water
A
To prevent backflow
What is the primary function of backflow preventers?
A
To allow water to flow in both directions
B
To prevent contaminated water from flowing back into the clean water supply
C
To increase water pressure in pipes
D
To filter impurities from water
B
To prevent contaminated water from flowing back into the clean water supply
What is back-siphonage primarily caused by?
A
The presence of cross-connections
B
Excessive water pressure
C
Negative pressure in the supply piping
D
Normal water flow conditions
C
Negative pressure in the supply piping
What are suitable applications for a Pressure vacuum breaker?
A
Fire protection systems
B
Irrigation systems
C
Residential plumbing
D
Industrial processes
B
Irrigation systems
What is considered a high hazard situation in relation to potable water supply?
A
Coffee machine
B
Irrigation without chemicals
C
Fire sprinkler systems containing toxic anti-freeze
D
Drink dispensers without carbonators
C
Fire sprinkler systems containing toxic anti-freeze
What are the advantages of using an air gap as a backflow prevention device?
A
Cost-effectiveness
B
Simplicity of installation
C
High reliability
D
Low maintenance
D
Low maintenance
What is the purpose of a backflow preventer?
A
To increase water pressure
B
To measure water flow
C
To prevent contamination of the water supply
D
To filter impurities from water
C
To prevent contamination of the water supply
What is the purpose of a line strainer in backflow prevention devices?
A
To prevent particles and corrosion products from affecting the device
B
To increase the water pressure in the system
C
To enhance the aesthetic appeal of the installation
D
To allow for easier maintenance of the device
A
To prevent particles and corrosion products from affecting the device
Which document is referenced for the schematic of listed valves?
A
G12/AS2
B
G12/AS1
C
G12/AS3
D
G12/AS4
B
G12/AS1
Air gaps offer the cheapest and most effective form of backflow prevention what are the installation requirements
25 mm or 2 x Diameter
what is the difference between a pressure vacuum breaker and a atmospheric vacuum breaker
The pressure-type vacuum breaker has a ventilation — or atmospheric — valve which is internally loaded, normally by means of a spring
Which back flow preventer device can be installed in a low and medium hazard toxic environment
Double check valve
what are the installation requirements for a double check valve except for those listed previously under general installation requirements.
There are no specific installation requirements
what is the conflict between the acceptable solutions and the installation standards for sprinkler systems
the requirement to install a line strainer upstream of a backflow preventer.
pressure-type vacuum breakers require that these shall be located no less than what measurement above the highest downstream outlet
300 mm
This device consists of two independent check valves connected in series, with a pressure monitored chamber between
Reduced pressure zone device
atmospheric vacuum breakers require that these shall be located no less than what measurement above the highest downstream outlet also not remain continuously pressurised for more than how many hours
150 mm and 12 hours
What is essential to be installed at a hospital regarding water mains and back flow
necessary to install a by-pass
Which backflow is created whenever the downstream pressure exceeds the supply pressure and where would you find this type of back flow in a domestic housing
Back-pressure
installations such as heating systems(hot water cylinder)