WATER OPERATOR (FLORIDA) LEVEL "B" PRACTICE
QUESTIONS WITH CORRECT ANSWERS
in split treatment, a portion of the water, about 90%, is treated with an excess amount
of lime to remove __________ at a ph of over ______ -- Answer ✔✔ magnesium / 11
if the finished water from an ion exchange unit has a salty taste to it, a probable cause
for the problem may be: -- Answer ✔✔ the rinse stage was unsuccessful.
the primary cause of resin breakdown in the exchange softening process is : -- Answer
✔✔ the presence of high chlorine residual
__________________ is used to remove noncarbonate hardness in chemical
precipitation. -- Answer ✔✔ sodium carbonate
in ion exchange softening, if iron in the form of ferric is found in the water, the unit will:
-- Answer ✔✔ act as a filter
in ion exchange a high chlorine residual will: -- Answer ✔✔ damage the resin
,a positive langlier index is an indicator that the water is: -- Answer ✔✔ scale forming
the metabolic process that consumes oxygen and releases carbon dioxide is: -- Answer
✔✔ respiration
in order for caco3 film to form: -- Answer ✔✔ there must be a movement in the water
next to the cathode.
low Ph and the absence of oxygen in a section of the distribution system may result in: -
- Answer ✔✔ formation of hydrogen sulfide
the factors that influence corrosion rates are: -- Answer ✔✔ DO and TDS
_____________ is recommended for corrosion control in waters with low alkalinity --
Answer ✔✔ ca(oh)2
a langlier index of 0 or a driving force index of 1 indicates the water is: -- Answer ✔✔
saturated
electrolysis is the result of: -- Answer ✔✔ stray electrical currents
When a galvanic cell occurs as a result of two dissimilar metals, it is imortant to know
that corrosion will always occur at the: -- Answer ✔✔ anode
, _________________ inhibits corrosion by forming a film on the interior of water
pipes. -- Answer ✔✔ calcium carbonate
scaling is a problem in hot water systems because ________________ is less soluble in
hot water than in cold water. -- Answer ✔✔ calcium carbonate
________________ is not a solution for corrosion problems -- Answer ✔✔ dissolved
oxygen saturation
___________________ has the greatest potential for being corrosive. -- Answer ✔✔
a soft water with low alkalinity, low Ph, and low mineral content (tds)
water with a negative langlier index indicates that the water is: -- Answer ✔✔ corrosive
the "C" factor of a water pipe is the: -- Answer ✔✔ measurement of interior roughness
test results indicate a PHS value of 8.7 and a Ph value of 8.8 for treated water. This
means: -- Answer ✔✔ the langlier index is between-0.2 and +0.2
in selecting corrosion control chemicals, if the product from multiplying the calcium
hardness by the alkalinity is 80, this indicates that: -- Answer ✔✔ both lime and carbon
dioxide may be required
in order for a calcium carbonate film to form: -- Answer ✔✔ the water must contain
bicarbonate ions.
QUESTIONS WITH CORRECT ANSWERS
in split treatment, a portion of the water, about 90%, is treated with an excess amount
of lime to remove __________ at a ph of over ______ -- Answer ✔✔ magnesium / 11
if the finished water from an ion exchange unit has a salty taste to it, a probable cause
for the problem may be: -- Answer ✔✔ the rinse stage was unsuccessful.
the primary cause of resin breakdown in the exchange softening process is : -- Answer
✔✔ the presence of high chlorine residual
__________________ is used to remove noncarbonate hardness in chemical
precipitation. -- Answer ✔✔ sodium carbonate
in ion exchange softening, if iron in the form of ferric is found in the water, the unit will:
-- Answer ✔✔ act as a filter
in ion exchange a high chlorine residual will: -- Answer ✔✔ damage the resin
,a positive langlier index is an indicator that the water is: -- Answer ✔✔ scale forming
the metabolic process that consumes oxygen and releases carbon dioxide is: -- Answer
✔✔ respiration
in order for caco3 film to form: -- Answer ✔✔ there must be a movement in the water
next to the cathode.
low Ph and the absence of oxygen in a section of the distribution system may result in: -
- Answer ✔✔ formation of hydrogen sulfide
the factors that influence corrosion rates are: -- Answer ✔✔ DO and TDS
_____________ is recommended for corrosion control in waters with low alkalinity --
Answer ✔✔ ca(oh)2
a langlier index of 0 or a driving force index of 1 indicates the water is: -- Answer ✔✔
saturated
electrolysis is the result of: -- Answer ✔✔ stray electrical currents
When a galvanic cell occurs as a result of two dissimilar metals, it is imortant to know
that corrosion will always occur at the: -- Answer ✔✔ anode
, _________________ inhibits corrosion by forming a film on the interior of water
pipes. -- Answer ✔✔ calcium carbonate
scaling is a problem in hot water systems because ________________ is less soluble in
hot water than in cold water. -- Answer ✔✔ calcium carbonate
________________ is not a solution for corrosion problems -- Answer ✔✔ dissolved
oxygen saturation
___________________ has the greatest potential for being corrosive. -- Answer ✔✔
a soft water with low alkalinity, low Ph, and low mineral content (tds)
water with a negative langlier index indicates that the water is: -- Answer ✔✔ corrosive
the "C" factor of a water pipe is the: -- Answer ✔✔ measurement of interior roughness
test results indicate a PHS value of 8.7 and a Ph value of 8.8 for treated water. This
means: -- Answer ✔✔ the langlier index is between-0.2 and +0.2
in selecting corrosion control chemicals, if the product from multiplying the calcium
hardness by the alkalinity is 80, this indicates that: -- Answer ✔✔ both lime and carbon
dioxide may be required
in order for a calcium carbonate film to form: -- Answer ✔✔ the water must contain
bicarbonate ions.
