TCEQ class c water license exam 2023 Already Passed!!
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
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
Aquifers
The purpose of an air line on a well is
Determine Water leves in the well
The mesh size is an important feature of a well screen because properly sized
openings should
Reduce the amount of Sand pumped
When treating surface Water, the process of coagularon will be most affected by
the
pH, alkalinity, temperature, and chemical Dosage
A rapid sand filter should be backwashed When
The loss of head gauge indicated between 6 and 10 feet
Which of the following is an acceptable disinfection residual at the far reaches of
the distribution System
0.2 mg/L free chlorine residual, 0.8 mg/L chloramine residual when using chloramine
treatment, 0.5 mg/L chloramine for surface water supply, 0.5 mg/L free chlorine residual
for ground water Supply
What is the approximate total volume of a circular tank in gallons, if it is 30 feet in
diameter, and 15 feet deep
79,300 gallons
You are using a chlorinator to provine a dosage of 4.0 mg/L. If the daily Water
usage is 750,000 gallons, the gas chlorinator feed rate should be set at
____________ pounds per day.
25
One gallon of water weighs
8.34 lbs.
One foot of water inside a storage vessel will raise a pressure gauge at the
bottom of the vessel by
0.433 lbs. (1 ft. Water creates 0.433 psi of pressure)
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
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
Aquifers
The purpose of an air line on a well is
Determine Water leves in the well
The mesh size is an important feature of a well screen because properly sized
openings should
Reduce the amount of Sand pumped
When treating surface Water, the process of coagularon will be most affected by
the
pH, alkalinity, temperature, and chemical Dosage
A rapid sand filter should be backwashed When
The loss of head gauge indicated between 6 and 10 feet
Which of the following is an acceptable disinfection residual at the far reaches of
the distribution System
0.2 mg/L free chlorine residual, 0.8 mg/L chloramine residual when using chloramine
treatment, 0.5 mg/L chloramine for surface water supply, 0.5 mg/L free chlorine residual
for ground water Supply
What is the approximate total volume of a circular tank in gallons, if it is 30 feet in
diameter, and 15 feet deep
79,300 gallons
You are using a chlorinator to provine a dosage of 4.0 mg/L. If the daily Water
usage is 750,000 gallons, the gas chlorinator feed rate should be set at
____________ pounds per day.
25
One gallon of water weighs
8.34 lbs.
One foot of water inside a storage vessel will raise a pressure gauge at the
bottom of the vessel by
0.433 lbs. (1 ft. Water creates 0.433 psi of pressure)
