TCEQ: Class C Water Operator License Exam 2024 Agrade latest version
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TCEQ: Class C Water Operator License
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TCEQ: Class C Water Operator License
A common chemical used in disinfection of small water supply is
Calcium hypochlorite
A physical connection between a potable water supply and house well would be
A cross connection
The amount of chlorine in mg/L that is used up by reacting with iron organics of bacteria is called
Demand
Amm...
TCEQ: Class C Water Operator License Exam
2024 Agrade latest version
State Agency responsince for enforcing the safe drinking water act in Texas
Texas Commission on environmental Quality
What minerals can cause water hardness
Calcium and magnesium
A public water system must at all times provide
Adequate quantity of water, pressure, and disinfection
A source groundwater would be
aquifer
Fecal coliform organisms sometimes found in water supplies are an indication that
Water supply is contaminated, harmful bacteria may be present, possible pathogenic organisms in the
water, water is unsuitable for drinking
A disease that may be spread by inadequately disinfected water
Dysentery
A common chemical used in disinfection of small water supply is
Calcium hypochlorite
A physical connection between a potable water supply and house well would be
A cross connection
The amount of chlorine in mg/L that is used up by reacting with iron organics of bacteria is called
Demand
Ammonia mixed with chlorine gas creates a - Answer- white smoke
The most difficult part of a water distribution operator's job. - Answer- furnish a continuous supply
Physical connection between a safe and potentially unsafe water source. - Answer- cross connection
,A distribution system is a - Answer- looped system
Dead end mains should be flushed - Answer- every month
Excess nitrate causes a condition called - Answer- blue baby syndrome
Water hardness is caused by - Answer- calcium and magnesium
Sewer mains should be __ft away from water mains. - Answer- 9
Water with a pH less than 7 is considered to be - Answer- acidic
Bacti records are kept for ____yrs and chemical records are kept for ___yrs. - Answer- 5, 10
Bacti samples have to be returned to the lab within ___hrs of the collection time. - Answer- 30
Color in the water supply should be less than _____ units. - Answer- 15
Chlorine is ______ times heavier than air. - Answer- 2.5
90% of underground pipe failures are related to improper - Answer- backfill and bedding
Which of the following is a physical characteristic of chlorine gas
Greenish-Yellow Color, heavier than air, pungent penetrating odor, corrosive
Which of the following would be considered a part of a hypo-chlorinator system
Solution feed pump
According to state requirements, all public water Supply wells should be provided with a raised
concrete sealing block, screened vents, and-
A flow measuring device
, Drawdown of a water well is determined by
Difference in static and pumping levels
pH of water indicates
If it's acidic or basic
The pH of water is expressed on a pH scale of
0-14
Water that is considered neutral is expressed on the pH scale at
7.0
Which of the following is a required Step in collecting a routine distribution sample for bacteriological
testing?
Use of an approved, sterile sample container
Sand filtration will remove which of the following from surface water
Turbidity
Activated carbon is used in a surface water plant primarily for
Taste and odor control
Which or the following chemicals are commonly used as coagulants in surface water treatment
Alum and ferric chloride
Ground storage tanks are required to provided with which of the following
Screened vents, an approved locking roof hatch, an overflow pipe with hinged flap device, annual
inspection and maintenance as needed
An elevated storage tank should be protected against corrosion by
Painting, cathodic protection, water stabilization, and only using galvanized and lead based primed
components
A public water supply system should maintain residual pressure of 20 psi and a minimum of normal
operating pressure of
35 psi
Before a new or repaired water line is placed into service, it must be properly disinfected by providing
a chlorine dosage of _________ and proper detention time
50 mg/L
Water bearing formations beneath the earths surface that are used as a source of water for public
water supplies are
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