WQA Annual Education 2012

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WQA Annual Education 2012 - Quiz 1

Methods and Devices for the Prevention of Backflow and Back Siphonage

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1. Which of the following backflow prevention methods may be used in high hazard situations?

A. Air gap

B. Atmospheric vacuum breaker

C. Barometric loop

D. Reduced pressure principle

Clear selection

2. Which of the following devices may NOT be used for backpressure prevention?

A. Air gap

B. Barometric loop

C. Double-check valve

D. Reduced pressure principle backflow preventer

Clear selection

3. In the absence of superseding instructions, what is the proper size of an air gap?

A. Equal to the drain diameter, but not less than ½ inch

B. Equal to the supply pipe diameter, but not less than 2 inches

C. Twice the supply pipe diameter, but not less than 1 inch

D. Twice the drain diameter, but not less than ½ inch

Clear selection

4. While an air gap may appear to be the least expensive backflow prevention method, what consequence of interrupting flow can increase the cost of the distribution system if the flow is needed for use downstream of the air gap?

A. A backpressure prevention device is still needed.

B. A repressurization system is needed.

C. Occasional excessive splashing can deteriorate walls and floors.

D. Water may be lost to evaporation.

Clear selection

5. Which of the following is a result of using an air gap?

A. Better protection from bacterial contamination

B. Conservation of distribution line pressure

C. Escape of the disinfectant residual in treated water

D. Less frequent inspections than for mechanical devices

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6. Why is the height of a barometric loop at sea level 35 feet?

A. It compensates for the maximum possible residential line pressure.

B. It compensates for the maximum rise in a water column.

C. That is the maximum size that can be supported with pipe hangers.

D. That is the standard size available on the market.

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7. What is an advantage of the pressure vacuum breaker over an atmospheric vacuum breaker?

A. It’s more dependable for backsiphonage protection.

B. It can be installed at less than 6” higher than the final outlet.

C. It can protect against backpressure conditions.

D. It can be tested in line.

Clear selection

8. What advantage does spring loading provide the double-check valve?

A. Can be tested in line

B. Lower pressure drop

C. May be used under continuous pressure

D. Seals despite presence of debris

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9. What is the purpose of the residential dual check valve?

A. Protect the home’s water supply from outside hose bibs

B. Protect the main public supply from contaminants in the home

C. Protect the availability of supply for firefighting

D. Protect the home’s water supply from contaminants in the public supply

Clear selection

10. What feature of the reduced pressure principle backflow preventer adds an additional level of protection not found in the residential dual check valve?

A. Atmospheric vent

B. Fouling prevention

C. Gate valves

D. Test cocks

Clear selection

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