TCEQ Class C Water License Exam Questions
with Correct Answers 100% Pass
State Agency responsince for enforcing the safe drinking water act in Texas - CORRECT ANSWER
-Texas Commission on environmental Quality
What minerals can cause water hardness - CORRECT ANSWER -Calcium and magnesium
A public water system must at all times provide - CORRECT ANSWER -Adequate quantity of
water, pressure, and disinfection
A source groundwater would be - CORRECT ANSWER -aquifer
Fecal coliform organisms sometimes found in water supplies are an indication that - CORRECT
ANSWER -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 - CORRECT ANSWER -Dysentery
A common chemical used in disinfection of small water supply is - CORRECT ANSWER -Calcium
hypochlorite
A physical connection between a potable water supply and house well would be - CORRECT
ANSWER -A cross connection
The amount of chlorine in mg/L that is used up by reacting with iron organics of bacteria is
called - CORRECT ANSWER -Demand
,Which of the following is a physical characteristic of chlorine gas - CORRECT ANSWER -Greenish-
Yellow Color, heavier than air, pungent penetrating odor, corrosive
Which of the following would be considered a part of a hypo-chlorinator system - CORRECT
ANSWER -Solution feed pump
According to state requirements, all public water Supply wells should be provided with a raised
concrete sealing block, screened vents, and- - CORRECT ANSWER -A flow measuring device
Drawdown of a water well is determined by - CORRECT ANSWER -Difference in static and
pumping levels
pH of water indicates - CORRECT ANSWER -If it's acidic or basic
The pH of water is expressed on a pH scale of - CORRECT ANSWER -0-14
Water that is considered neutral is expressed on the pH scale at - CORRECT ANSWER -7.0
Which of the following is a required Step in collecting a routine distribution sample for
bacteriological testing? - CORRECT ANSWER -Use of an approved, sterile sample container
Sand filtration will remove which of the following from surface water - CORRECT ANSWER -
Turbidity
Activated carbon is used in a surface water plant primarily for - CORRECT ANSWER -Taste and
odor control
, Which or the following chemicals are commonly used as coagulants in surface water treatment -
CORRECT ANSWER -Alum and ferric chloride
Ground storage tanks are required to provided with which of the following - CORRECT ANSWER -
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 - CORRECT ANSWER -
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 - CORRECT ANSWER -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 - CORRECT ANSWER -50
mg/L
Water bearing formations beneath the earths surface that are used as a source of water for
public water supplies are - CORRECT ANSWER -Aquifers
The purpose of an air line on a well is - CORRECT ANSWER -Determine Water leves in the well
The mesh size is an important feature of a well screen because properly sized openings should -
CORRECT ANSWER -Reduce the amount of Sand pumped
When treating surface Water, the process of coagularon will be most affected by the - CORRECT
ANSWER -pH, alkalinity, temperature, and chemical Dosage
with Correct Answers 100% Pass
State Agency responsince for enforcing the safe drinking water act in Texas - CORRECT ANSWER
-Texas Commission on environmental Quality
What minerals can cause water hardness - CORRECT ANSWER -Calcium and magnesium
A public water system must at all times provide - CORRECT ANSWER -Adequate quantity of
water, pressure, and disinfection
A source groundwater would be - CORRECT ANSWER -aquifer
Fecal coliform organisms sometimes found in water supplies are an indication that - CORRECT
ANSWER -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 - CORRECT ANSWER -Dysentery
A common chemical used in disinfection of small water supply is - CORRECT ANSWER -Calcium
hypochlorite
A physical connection between a potable water supply and house well would be - CORRECT
ANSWER -A cross connection
The amount of chlorine in mg/L that is used up by reacting with iron organics of bacteria is
called - CORRECT ANSWER -Demand
,Which of the following is a physical characteristic of chlorine gas - CORRECT ANSWER -Greenish-
Yellow Color, heavier than air, pungent penetrating odor, corrosive
Which of the following would be considered a part of a hypo-chlorinator system - CORRECT
ANSWER -Solution feed pump
According to state requirements, all public water Supply wells should be provided with a raised
concrete sealing block, screened vents, and- - CORRECT ANSWER -A flow measuring device
Drawdown of a water well is determined by - CORRECT ANSWER -Difference in static and
pumping levels
pH of water indicates - CORRECT ANSWER -If it's acidic or basic
The pH of water is expressed on a pH scale of - CORRECT ANSWER -0-14
Water that is considered neutral is expressed on the pH scale at - CORRECT ANSWER -7.0
Which of the following is a required Step in collecting a routine distribution sample for
bacteriological testing? - CORRECT ANSWER -Use of an approved, sterile sample container
Sand filtration will remove which of the following from surface water - CORRECT ANSWER -
Turbidity
Activated carbon is used in a surface water plant primarily for - CORRECT ANSWER -Taste and
odor control
, Which or the following chemicals are commonly used as coagulants in surface water treatment -
CORRECT ANSWER -Alum and ferric chloride
Ground storage tanks are required to provided with which of the following - CORRECT ANSWER -
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 - CORRECT ANSWER -
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 - CORRECT ANSWER -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 - CORRECT ANSWER -50
mg/L
Water bearing formations beneath the earths surface that are used as a source of water for
public water supplies are - CORRECT ANSWER -Aquifers
The purpose of an air line on a well is - CORRECT ANSWER -Determine Water leves in the well
The mesh size is an important feature of a well screen because properly sized openings should -
CORRECT ANSWER -Reduce the amount of Sand pumped
When treating surface Water, the process of coagularon will be most affected by the - CORRECT
ANSWER -pH, alkalinity, temperature, and chemical Dosage
