Class "C" Water Exam Questions & Answers
Top Taken Solution
A common chemical used in the disinfection of a small water supply is- - ✔✔✔ - Calcium Hypochlorite
A physical connection between a potable water supply and a house well would be- - ✔✔✔ - A Cross
Connection
The amount of Chlorine in mg/L that is used by reacting with iron, organics, or bacteria is called? -
✔✔✔ - Demand
All of the following are Physical characteristics 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- - ✔✔✔ - Flow measuring device
The drawdown of a water well is determined by- - ✔✔✔ - The difference in static and pumping levels
The pH of water indicates- - ✔✔✔ - If it is more acidic or base
The pH of water is expressed by a scale of numbers ranging from- - ✔✔✔ - 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 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 of the following chemical(s) are commonly used as coagulants in surface water treatment? -
✔✔✔ - Alum and Ferric Chloride
Ground storage tanks are required to be 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
A public water supply system should maintain residual pressure of 20 psi and a minimum 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 earth's surface that are used as a source of water for public
water supplies are- - ✔✔✔ - Aquifers
, The purpose of an airline on a well is- - ✔✔✔ - Determine water levels in the well
The mesh size is an important feature of a well screen because property sized openings should- -
✔✔✔ - Reduce the amount of sand pumped
When treating surface water, the process of coagulation will be most affected by the- - ✔✔✔ - pH,
alkalinity, temperature, and chemical dosage
A rapid sand filter should be backwashed when- - ✔✔✔ - 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- - ✔✔✔ - 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- - ✔✔✔ - 8.34 lbs
One foot of water inside a storage vessel will raise a pressure gauge at the bottom of the vessel by- -
✔✔✔ - .433 lbs
A raw water intake structure may not be constructed within _____ feet of a boat ramp, dock, or marina
- ✔✔✔ - 1000 ft
Common Type(s) of pump(s) for use in water wells are- - ✔✔✔ - Vertical Turbine
Submersible
_____ is the natural exchange of water between the earth and air. - ✔✔✔ - Hydrological Cycle
Top Taken Solution
A common chemical used in the disinfection of a small water supply is- - ✔✔✔ - Calcium Hypochlorite
A physical connection between a potable water supply and a house well would be- - ✔✔✔ - A Cross
Connection
The amount of Chlorine in mg/L that is used by reacting with iron, organics, or bacteria is called? -
✔✔✔ - Demand
All of the following are Physical characteristics 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- - ✔✔✔ - Flow measuring device
The drawdown of a water well is determined by- - ✔✔✔ - The difference in static and pumping levels
The pH of water indicates- - ✔✔✔ - If it is more acidic or base
The pH of water is expressed by a scale of numbers ranging from- - ✔✔✔ - 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 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 of the following chemical(s) are commonly used as coagulants in surface water treatment? -
✔✔✔ - Alum and Ferric Chloride
Ground storage tanks are required to be 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
A public water supply system should maintain residual pressure of 20 psi and a minimum 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 earth's surface that are used as a source of water for public
water supplies are- - ✔✔✔ - Aquifers
, The purpose of an airline on a well is- - ✔✔✔ - Determine water levels in the well
The mesh size is an important feature of a well screen because property sized openings should- -
✔✔✔ - Reduce the amount of sand pumped
When treating surface water, the process of coagulation will be most affected by the- - ✔✔✔ - pH,
alkalinity, temperature, and chemical dosage
A rapid sand filter should be backwashed when- - ✔✔✔ - 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- - ✔✔✔ - 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- - ✔✔✔ - 8.34 lbs
One foot of water inside a storage vessel will raise a pressure gauge at the bottom of the vessel by- -
✔✔✔ - .433 lbs
A raw water intake structure may not be constructed within _____ feet of a boat ramp, dock, or marina
- ✔✔✔ - 1000 ft
Common Type(s) of pump(s) for use in water wells are- - ✔✔✔ - Vertical Turbine
Submersible
_____ is the natural exchange of water between the earth and air. - ✔✔✔ - Hydrological Cycle
