TCEQ Class D Water operator license
Questions and Answers (100% Correct
Answers) Already Graded A+
Rule of capture [ Ans: ] Permits owner of a well to pump
as much water as desired, even if water is drained from
beneath the land of others
when treating surface water, the process of coagulation
will be affected by [ Ans: ] all of the above
a public water system is responsible for providing [ Ans: ]
all of the above
a common type of oxidant that is used at most surface
water treatment plants to kill bacteria and to prevent
trihalomethane formation is [ Ans: ] combined chlorine
Which of the following is a required step in collecting a
routine distribution sample of microbiological analysis [
Ans: ] use a sterilized bottles containing sodium
thiosulfate
which minerals cause water hardness [ Ans: ] calcium and
magnesium
Before a new main is placed into service, it must be
properly disinfected with a minimum chlorine dosage of:
a) 50 mg/L
,b) 30 mg/L
c) 40 mg/L
d) 75 mg/L
e) 25 mg/L [ Ans: ] 25 mg/L
A disease which may be spread by inadequately
disinfected water is [ Ans: ] Hepatitis A
A physical connection between a potable water supply and
non-potable water source is [ Ans: ] cross connection
underground geological water bearing formations that are
used for public water supplies are called [ Ans: ] aquifers
Gravity filters will remove which of the following from
surface water supplies:
a) turbidity
b) taste and odors
c) nitrates
d) hardness
e) chlorides [ Ans: ] turbidity
Activated carbon is used at a surface water treatment
plant primarily for [ Ans: ] taste and odor control
,Your ground storage tank is 15 feet high and 30 feet in
diameter. About how much water can it hold?
a) 31,700 gallons
b) 79,270 gallons
c) 50, 490 gallons
d) 25,150 gallons
e) 10,600 gallons [ Ans: ] 79270
If you added 3.5 mg/L of chlorine to your storage tank
and 30 minutes later measured the residual at 1.2 mg/L,
what was the chlorine demand in the tank?
a) 4.2
b) 2.9
c) 0.3
d) 2.3
e) 4.7 [ Ans: ] 2.3
which of the following chemicals is commonly used as a
coagulant in surface water treatment [ Ans: ] aluminum
sulfate
The drawdown of a well is determined by:
, a) a properly installed air line
b) the difference between the static and pumping level
c) a psi gage calibrated in feet of water
d) a tape measure
e) an electronic sounder [ Ans: ] the difference between
static and pumping level
you are setting your chlorinator to feed a dosage of 5.0
mg/L. If your daily water pumpage is 500,000 gallons, the
gas chlorinator should be set at how many pounds per day
[ Ans: ] 21 ppd
which of the following is a characteristic of gas chlorine [
Ans: ] pungent, biting odor
disinfection means [ Ans: ] the destroying of pathogenic
organisms
the mesh size is an important feature of a well screen
because properly sized opening should [ Ans: ] reduced
the amount of sand pumped from the well
according to states rules, all public water supply wells
must be provided with concrete sealing slabs, screened
casing vents, raw water sampling taps and [ Ans: ] flow
measuring devices
Questions and Answers (100% Correct
Answers) Already Graded A+
Rule of capture [ Ans: ] Permits owner of a well to pump
as much water as desired, even if water is drained from
beneath the land of others
when treating surface water, the process of coagulation
will be affected by [ Ans: ] all of the above
a public water system is responsible for providing [ Ans: ]
all of the above
a common type of oxidant that is used at most surface
water treatment plants to kill bacteria and to prevent
trihalomethane formation is [ Ans: ] combined chlorine
Which of the following is a required step in collecting a
routine distribution sample of microbiological analysis [
Ans: ] use a sterilized bottles containing sodium
thiosulfate
which minerals cause water hardness [ Ans: ] calcium and
magnesium
Before a new main is placed into service, it must be
properly disinfected with a minimum chlorine dosage of:
a) 50 mg/L
,b) 30 mg/L
c) 40 mg/L
d) 75 mg/L
e) 25 mg/L [ Ans: ] 25 mg/L
A disease which may be spread by inadequately
disinfected water is [ Ans: ] Hepatitis A
A physical connection between a potable water supply and
non-potable water source is [ Ans: ] cross connection
underground geological water bearing formations that are
used for public water supplies are called [ Ans: ] aquifers
Gravity filters will remove which of the following from
surface water supplies:
a) turbidity
b) taste and odors
c) nitrates
d) hardness
e) chlorides [ Ans: ] turbidity
Activated carbon is used at a surface water treatment
plant primarily for [ Ans: ] taste and odor control
,Your ground storage tank is 15 feet high and 30 feet in
diameter. About how much water can it hold?
a) 31,700 gallons
b) 79,270 gallons
c) 50, 490 gallons
d) 25,150 gallons
e) 10,600 gallons [ Ans: ] 79270
If you added 3.5 mg/L of chlorine to your storage tank
and 30 minutes later measured the residual at 1.2 mg/L,
what was the chlorine demand in the tank?
a) 4.2
b) 2.9
c) 0.3
d) 2.3
e) 4.7 [ Ans: ] 2.3
which of the following chemicals is commonly used as a
coagulant in surface water treatment [ Ans: ] aluminum
sulfate
The drawdown of a well is determined by:
, a) a properly installed air line
b) the difference between the static and pumping level
c) a psi gage calibrated in feet of water
d) a tape measure
e) an electronic sounder [ Ans: ] the difference between
static and pumping level
you are setting your chlorinator to feed a dosage of 5.0
mg/L. If your daily water pumpage is 500,000 gallons, the
gas chlorinator should be set at how many pounds per day
[ Ans: ] 21 ppd
which of the following is a characteristic of gas chlorine [
Ans: ] pungent, biting odor
disinfection means [ Ans: ] the destroying of pathogenic
organisms
the mesh size is an important feature of a well screen
because properly sized opening should [ Ans: ] reduced
the amount of sand pumped from the well
according to states rules, all public water supply wells
must be provided with concrete sealing slabs, screened
casing vents, raw water sampling taps and [ Ans: ] flow
measuring devices
