TCEQ: Class D Water Operator License Exam 2024 Agrade latest version
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TCEQ: Class D Water Operator License
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TCEQ: Class D Water Operator License
You dose your ground storage tank with 5.0 ppm of chlorine. You come back in 45 min and test the chlorine residual at 1.5 ppm. How much was chlorine demand in the water - Answer- dosage - residual = demand
5 - 1.5 = 3.5 ppm
The action level for lead is --- mg/L and copper is --- mg/L. - Answe...
TCEQ: Class D Water Operator License Exam
2024 Agrade latest version
Rule of capture - Answer- 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 - Answer- all of the above
a public water system is responsible for providing - Answer- 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 - Answer- combined chlorine
Which of the following is a required step in collecting a routine distribution sample of microbiological
analysis - Answer- use a sterilized bottles containing sodium thiosulfate
The purpose of an airline on a well is - Answer-
which minerals cause water hardness - Answer- 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 - Answer- 25 mg/L
,A disease which may be spread by inadequately disinfected water is - Answer- Hepatitis A
A physical connection between a potable water supply and non-potable water source is - Answer-
cross connection
Operators have a responsibility to provide drinking water that meets ______ and ______ standards. -
Answer- federal, state
Water must be ______, delivered at adequate ______, and be ample in ______. - Answer- disinfected,
pressure, quantity
Utility employees should guard the water supply and facilities from _____, _____, and even ______. -
Answer- contamination, vandalism, terrorism.
The state requires bacteriological sample results to be kept ______ years. - Answer- 5
The state requires chemical analysis be kept at least ______ years. - Answer- 10
EPA requires a water system to keep a copy of each consumer confidence report at least _____ years.
- Answer- 5
A public water system provides the public with piped water for human consumption, serves at least
_____ service connections, and regularly serves at least _____ individuals daily at least _____ days out
of the year. - Answer- 15, 25, 60
The water utility field affects everyone because ________. - Answer- water is essential to life and
health.
The water utility employee should remember customers are entitled to ______ treatment and _____
to questions about water. - Answer- courteous, answers
In Texas, water operator licensing is administered by the ______. - Answer- TCEQ
,All public water systems are required to employ licensed operators even if the system only
______________ treated water brought from another source. - Answer- redistributes
underground geological water bearing formations that are used for public water supplies are called -
Answer- 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 - Answer- turbidity
Activated carbon is used at a surface water treatment plant primarily for - Answer- taste and odor
control
Which of the following is part of a hyperchlorination system - Answer-
A common chemical used for disinfecting a small public water supply is - Answer-
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 - Answer- 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 - Answer- 2.3
which of the following chemicals is commonly used as a coagulant in surface water treatment -
Answer- 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 - Answer- 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 - Answer- 21 ppd
which of the following is a characteristic of gas chlorine - Answer- pungent, biting odor
which of the following is an acceptable level of residual chlorine in the far reaches of a distribution
system - Answer-
disinfection means - Answer- the destroying of pathogenic organisms
the mesh size is an important feature of a well screen because properly sized opening should -
Answer- reduced the amount of sand pumped from the well
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