FDEP Water treatment C exam with
correct answers
Units that combine coagulation, Flocc, & sedimentation into a single basin are: - **
VERIFIED ANSWERS **✔✔Solid contact units
Valves that operate 90 degrees open to shut are: - ** VERIFIED ANSWERS **✔✔Eccentric
and butterfly
Which of the following methods is best for determining the depth of water in a clearwell: - **
VERIFIED ANSWERS **✔✔bubbler
Chlorine expands approximately how many times from liquid to gas? - ** VERIFIED
ANSWERS **✔✔450
According to the safe water drinking act, the basic definition of public water supply system
is any water system that supplies water for human consumption that serves: - ** VERIFIED
ANSWERS **✔✔15 service connections or over 25 persons for over 60 days a year
Normally calcium and magnesium ions are expressed as ________ when dealing with
softening. - ** VERIFIED ANSWERS **✔✔CaCo3
The water in the I-95 elevated tank has a temperature of 15 degrees Celsius, the PH is 8.7,
pressure gauge is reading 52psi, cl2 residual is 3.8mg/l how many feet is the water tank?
52ft
15ft
38ft
,120ft - ** VERIFIED ANSWERS **✔✔120ft = (2.31x52)
What is the logarithm of the reciprocal the the hydrogen ion activity?
Acidic solution
Ph
standard solution
molar solution - ** VERIFIED ANSWERS **✔✔Ph
What is the detention time in minutes for a basin that is 15th in diameter and 12ft deep and
treats a flow of .532 mgd?
48 min.
487 min
42.9 min
27.53 min - ** VERIFIED ANSWERS **✔✔42.9 D = volume / flow
Name two reserve flow conditions that cause back-flow in a distribution system.
water hammer and air gap
vacuum breaker and back sihponage
back-pressure and backflow
back-pressure and back siphonage - ** VERIFIED ANSWERS **✔✔back-pressure and back
siphonage
The nephlometric method of measuring turbidity is based on:
scattering of light
transmission of light
, absorption of light
passage of light - ** VERIFIED ANSWERS **✔✔scattering of light
what is the definition of the nutrient poor portion of the lake.
eutrophic
ogliotrophic
mesatrophic
hypotrophic - ** VERIFIED ANSWERS **✔✔ogliotrophic
what is the definition of the nutrient rich portion of the lake.
eutrophic
ogliotrophic
mesatrophic
hypotrophic - ** VERIFIED ANSWERS **✔✔eutrophic
Alkalinity consist predominately in which of the following forms?
Bicarbonate, carbonate, and hydroxide
carbon dioxide and bicarbonate
carbonate and carbon dioxide
carbonate, carbon dioxide, and bicarbonate - ** VERIFIED ANSWERS **✔✔Bicarbonate,
carbonate, and hydroxide
The highest concentration of hypoclorous acid occurs at what Ph?
5
6
7
correct answers
Units that combine coagulation, Flocc, & sedimentation into a single basin are: - **
VERIFIED ANSWERS **✔✔Solid contact units
Valves that operate 90 degrees open to shut are: - ** VERIFIED ANSWERS **✔✔Eccentric
and butterfly
Which of the following methods is best for determining the depth of water in a clearwell: - **
VERIFIED ANSWERS **✔✔bubbler
Chlorine expands approximately how many times from liquid to gas? - ** VERIFIED
ANSWERS **✔✔450
According to the safe water drinking act, the basic definition of public water supply system
is any water system that supplies water for human consumption that serves: - ** VERIFIED
ANSWERS **✔✔15 service connections or over 25 persons for over 60 days a year
Normally calcium and magnesium ions are expressed as ________ when dealing with
softening. - ** VERIFIED ANSWERS **✔✔CaCo3
The water in the I-95 elevated tank has a temperature of 15 degrees Celsius, the PH is 8.7,
pressure gauge is reading 52psi, cl2 residual is 3.8mg/l how many feet is the water tank?
52ft
15ft
38ft
,120ft - ** VERIFIED ANSWERS **✔✔120ft = (2.31x52)
What is the logarithm of the reciprocal the the hydrogen ion activity?
Acidic solution
Ph
standard solution
molar solution - ** VERIFIED ANSWERS **✔✔Ph
What is the detention time in minutes for a basin that is 15th in diameter and 12ft deep and
treats a flow of .532 mgd?
48 min.
487 min
42.9 min
27.53 min - ** VERIFIED ANSWERS **✔✔42.9 D = volume / flow
Name two reserve flow conditions that cause back-flow in a distribution system.
water hammer and air gap
vacuum breaker and back sihponage
back-pressure and backflow
back-pressure and back siphonage - ** VERIFIED ANSWERS **✔✔back-pressure and back
siphonage
The nephlometric method of measuring turbidity is based on:
scattering of light
transmission of light
, absorption of light
passage of light - ** VERIFIED ANSWERS **✔✔scattering of light
what is the definition of the nutrient poor portion of the lake.
eutrophic
ogliotrophic
mesatrophic
hypotrophic - ** VERIFIED ANSWERS **✔✔ogliotrophic
what is the definition of the nutrient rich portion of the lake.
eutrophic
ogliotrophic
mesatrophic
hypotrophic - ** VERIFIED ANSWERS **✔✔eutrophic
Alkalinity consist predominately in which of the following forms?
Bicarbonate, carbonate, and hydroxide
carbon dioxide and bicarbonate
carbonate and carbon dioxide
carbonate, carbon dioxide, and bicarbonate - ** VERIFIED ANSWERS **✔✔Bicarbonate,
carbonate, and hydroxide
The highest concentration of hypoclorous acid occurs at what Ph?
5
6
7
