Quiz 4: Numbers Don’t Lie: A Water Math Tutorial (0.25 CPD)

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8 points required to pass; note: Q9 is worth 3 points

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1. What does the number 183 represent?

1 point

A multiplier for the cross-sectional area of a media bed

A quick way to calculate the radius of a cylinder in ft^2

A short cut for converting the square of the diameter from in^2 to ft^2

Clear selection

2. Which is the correct formula for calculating the cross-sectional area of a media bed in a pressure tank?

1 point

Multiply ½ the diameter by π then by the depth of the bed

Multiply the media bed volume by the surface flowrate

Multiply the radius by π then by the depth of the bed

Multiply the square of ½ of the tank diameter by π

Clear selection

3. If the cross-sectional area of a media bed is 0.79 ft^3 for every foot of depth, what is the bed volume of a 2.5 ft deep bed?

1 point

1.98 ft3

2.96 ft3

4.94 ft3

Clear selection

4. If the loading factor of a media is given as 3 gpm/ft2, what is the minimum standard tank diameter as listed on Chart A that can be used for a 7 gpm peak flow rate and not exceed the loading rate?

1 point

1.5 ft

2.3 ft2

18 in

21 in

Clear selection

5. What does the freeboard height need to be in a tank with a media bed 36” deep, 14” in diameter, and a manufacturer-specified 50% minimum bed expansion requirement?

1 point

1.2 ft

1.5 ft

2.8 ft

3.0 ft

Clear selection

6. What is the height, in feet, of a standard 10x54 tank (measured from the bottom of the tank to the tank opening)?

1 point

4.5

10.5

54.2

78.5

Clear selection

7. If a residential basement has a ceiling height of 7 feet, why is the 14x65 tank typically the tallest used? (Note: This is not in the article, but you’re a WQA Certified professional and should be able to answer this.)

1 point

Most basements can’t accommodate a larger diameter tank

So that the technician doesn’t need a ladder when installing

So that the customer won’t need a ladder to fill the brine tank

To ensure enough vertical space for the control valve and service

Clear selection

8. What media bed volume is needed to ensure 7.5 minutes EBCT in a VOC removal application for a 7 gpm peak flowrate?

1 point

7.0 ft3

8.0 ft3

24 in

36 in

Clear selection

9. Select the appropriate tank configuration for a chloramine removal application if the EBCT is 5 min, the flow rate is 12 gpm, and the required bed expansion is 30%. The treatment system must fit in a non-standard basement with a 6 ft tall ceiling. [3 points]

3 points

One 24x72, single tank

Three 10x54, piped in series

Three 12x60, piped in series

Two 14x65, piped in series

Clear selection

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