one
two
three
four
five
250

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

250

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

250

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

250

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

250

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

300

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

300

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

300

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

300

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

300

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

350

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

350

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

350

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

350

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

350

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

400

Air gaps offer the cheapest and most effective form of backflow prevention what are the installation requirements

25 mm or 2 x Diameter

400

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 


400

Which back flow preventer device can be installed in a low and medium hazard toxic environment

Double check valve

400

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

400

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.

500

pressure-type vacuum breakers require that these shall be located no less than what measurement above the highest downstream outlet

300 mm

500

This device consists of two independent check valves connected in series, with a pressure monitored chamber between

Reduced pressure zone device

500

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

500

What is essential to be installed at a hospital regarding water mains and back flow

necessary to install a by-pass

500

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)