Water Treatment

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Congratulations - you have completed Water Treatment. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%

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Question 1

Foaming on the water surface of a steam boiler is a condition caused by _____.

A	insufficient salt content
B	dissolved oxygen
C	oil, grease and/or sediment
D	colloidal substances

Question 2

Which of the following is an incorrect statement about untreated water?

A	It absorbs gases from the air.
B	It will dissolve piping.
C	It will dissolve minerals from the soil.
D	It should be used in HVAC systems.

Question 3

Backwashing of a multimedia filter must be done to _____.

A	reverse the direction of filter operation
B	regenerate the filtering material
C	prevent the accumulated particles from clogging the filter
D	arrange the levels of filtering material so that the coarsest level is at the top and the finest level is at the bottom

Question 4

The concentration of a certain mineral in a water sample is 10 grains per gallon (gpg). Expressed in parts per million (ppm), the concentration level is equal to _____ ppm.

A	170
B	100
C	1,000
D	1.7

Question 5

For a given physical size cartridge filter, the depth-type filter _____.

A	has about the same removal efficiency as the surface-type
B	has a lower removal efficiency than the surface-type
C	has a higher removal efficiency than the surface-type
D	handles higher flow rates than a surface-type filter

Question 6

Water with a pH of 7 is _____.

A	strongly acidic
B	alkaline
C	neutral
D	acidic

Question 7

To minimize corrosion in a steam boiler, the P-alkalinity of the boiler water should be maintained between _____ ppm.

A	50 and 100
B	100 and 200
C	300 and 700
D	200 and 300

Question 8

As the hardness level of water increases, the potential for scaling _____.

A	remains the same
B	decreases
C	there is no relationship between hardness level and scaling
D	increases

Question 9

In a closed chilled-water system, the formation of scale is _____.

A	normally not a problem
B	a frequent problem
C	speeded up by the colder water temperatures
D	speeded up by the use of low pH water

Question 10

Dissolved solids present in water _____.

A	can cause the water to look cloudy
B	may be visible
C	can cause the water to look muddy
D	are not visible

Question 11

A bleed-off procedure is used to _____.

A	drain a boiler
B	release excess steam pressure
C	get rid of excess condensate water
D	reduce impurities in the water

Question 12

Changes in the chemical composition of materials internal to a water system caused by electrolysis will most likely result in _____.

A	corrosion
B	suspended solid matter
C	scaling
D	oxidation

Question 13

To lower the pH of the water in a cooling tower, you would add the correct amount of _____.

A	sodium bicarbonate
B	alkali
C	alkali
D	sulfuric acid

Question 14

A common way to remove sludge from a boiler is to _____.

A	add colloidal substances to water
B	increase the acidity of the water
C	perform periodic blowdowns
D	add anti-foaming chemicals to the water

Question 15

A chemical substance that reduces the rate of corrosion or scale formation in a water system is called an _____.

A	electrolyte
B	algaecide
C	anti-fouler
D	inhibitor

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Water Treatment

Water Treatment

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