Class "C" Water Exam 165 complete
rated A+ Solutions.
Class "C" Water Exam 165 complete
rated A+ Solutions.
A common chemical used in the disenfection of a small water supply is- - ANSWER Calcium Hypochlorite
A physical connection between a potable water supply and a house well would be- - ANSWER A Cross
Connection
The amount of Chlorine in mg/L that is used by reacting with iron, organics, or bacteria is called? -
ANSWER Demand
All of the following are Physical characteristics of Chlorine gas- - 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? - 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- - ANSWER Flow measuring device
The drawdown of a water well is determined by- - ANSWER The difference in static and pumping levels
The pH of water indicates- - ANSWER If it is more acidic or base
The pH of water is expressed by a scale of numbers ranging from- - ANSWER 0-14
,Class "C" Water Exam 165 complete
rated A+ Solutions.
Water that is considered neutral is expressed on the pH scale at- - ANSWER 7.0
Which of the following is a required step in collecting a routine distribution sample for bacteriological
testing? - ANSWER Use of an approved, sterile container
Sand filtration will remove which of the following from surface water? - ANSWER Turbidity
Activated Carbon is used in a Surface Water Plant primarily for? - ANSWER Taste and Odor control
Which of the following chemical(s) are commonly used as coagulants in surface water treatment? -
ANSWER Alum and Ferric Chloride
Ground storage tanks are required to be provided with which of the following? - 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- - ANSWER Painting
Cathodic protection
Water stabilization
A public water supply system should maintain residual pressure of 20 psi and a minimum normal
operating pressure of- - 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. - ANSWER 50 mg/L
, Class "C" Water Exam 165 complete
rated A+ Solutions.
Water bearing formations beneath the earth's surface that are used as a source of water for public
water supplies are- - ANSWER Aquifers
The purpose of an air line on a well is- - ANSWER Determine water levels in the well
The mesh size is an important feature of a well screen because property sized openings should- -
ANSWER Reduce the amount of sand pumped
When treating surface water, the process of coagulation will be most affected by the- - ANSWER pH,
alkalinity, temperature, and chemical dosage
A rapid sand filter should be backwashed when- - ANSWER When the loss of head gauge indicated
between 6 and 10 ft.
Which of the following is an acceptable disinfection residual at the far reaches of the distribution
system- - ANSWER 0.2 mg/L free chlorine residual
0.5 mg/L chloramine residual for a surface water supply
0.8 mg/L chloramine residual when using chloramine treatment
0.5 mg/L free chlorine residual for a groundwater supply
One gallon of water weighs- - ANSWER 8.34 lbs
One foot of water inside a storage vessel will raise a pressure gauge at the bottom of the vessel by- -
ANSWER .433 lbs
A raw water intake structure may not be constructed within _____ feet of a boat ramp, dock, or marina -
ANSWER 1000 ft
Common Type(s) of pump(s) for use in water wells are- - ANSWER Vertical Turbine
Submersible
rated A+ Solutions.
Class "C" Water Exam 165 complete
rated A+ Solutions.
A common chemical used in the disenfection of a small water supply is- - ANSWER Calcium Hypochlorite
A physical connection between a potable water supply and a house well would be- - ANSWER A Cross
Connection
The amount of Chlorine in mg/L that is used by reacting with iron, organics, or bacteria is called? -
ANSWER Demand
All of the following are Physical characteristics of Chlorine gas- - 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? - 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- - ANSWER Flow measuring device
The drawdown of a water well is determined by- - ANSWER The difference in static and pumping levels
The pH of water indicates- - ANSWER If it is more acidic or base
The pH of water is expressed by a scale of numbers ranging from- - ANSWER 0-14
,Class "C" Water Exam 165 complete
rated A+ Solutions.
Water that is considered neutral is expressed on the pH scale at- - ANSWER 7.0
Which of the following is a required step in collecting a routine distribution sample for bacteriological
testing? - ANSWER Use of an approved, sterile container
Sand filtration will remove which of the following from surface water? - ANSWER Turbidity
Activated Carbon is used in a Surface Water Plant primarily for? - ANSWER Taste and Odor control
Which of the following chemical(s) are commonly used as coagulants in surface water treatment? -
ANSWER Alum and Ferric Chloride
Ground storage tanks are required to be provided with which of the following? - 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- - ANSWER Painting
Cathodic protection
Water stabilization
A public water supply system should maintain residual pressure of 20 psi and a minimum normal
operating pressure of- - 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. - ANSWER 50 mg/L
, Class "C" Water Exam 165 complete
rated A+ Solutions.
Water bearing formations beneath the earth's surface that are used as a source of water for public
water supplies are- - ANSWER Aquifers
The purpose of an air line on a well is- - ANSWER Determine water levels in the well
The mesh size is an important feature of a well screen because property sized openings should- -
ANSWER Reduce the amount of sand pumped
When treating surface water, the process of coagulation will be most affected by the- - ANSWER pH,
alkalinity, temperature, and chemical dosage
A rapid sand filter should be backwashed when- - ANSWER When the loss of head gauge indicated
between 6 and 10 ft.
Which of the following is an acceptable disinfection residual at the far reaches of the distribution
system- - ANSWER 0.2 mg/L free chlorine residual
0.5 mg/L chloramine residual for a surface water supply
0.8 mg/L chloramine residual when using chloramine treatment
0.5 mg/L free chlorine residual for a groundwater supply
One gallon of water weighs- - ANSWER 8.34 lbs
One foot of water inside a storage vessel will raise a pressure gauge at the bottom of the vessel by- -
ANSWER .433 lbs
A raw water intake structure may not be constructed within _____ feet of a boat ramp, dock, or marina -
ANSWER 1000 ft
Common Type(s) of pump(s) for use in water wells are- - ANSWER Vertical Turbine
Submersible
