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Class _C_ Water Exam _ final exam Questions and Answers 100- Correct.pdf
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8/23/24, 8:41 PMClass "C" Water Exam
Jeremiah
Practice questions for this set
Terms in this set (165)
Calcium Hypochlorite A common chemical used in the disenfection of a small water supply is-
A Cross Connection A physical connection between a potable water supply and a house well would be-
The amount of Chlorine in mg/L that is used by reacting with iron, organics, or bacteria
Demand
is called?
Greenish Yellow color All of the following are Physical characteristics of Chlorine gas-
Heavier than air
Pungent, Penetrating odor
Corrosive
Solution feed pump Which of the following would be considered a part of a hypo-chlorinator system?
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, 8/23/24, 8:41 PM
According to state requirements, all public water supply wells should be provided with
Flow measuring device
a raised concrete sealing block, screened vents and-
The difference in static and pumping levels The drawdown of a water well is determined by-
If it is more acidic or base The pH of water indicates-
0-14 The pH of water is expressed by a scale of numbers ranging from-
7.0 Water that is considered neutral is expressed on the pH scale at-
Which of the following is a required step in collecting a routine distribution sample for
Use of an approved, sterile container
bacteriological testing?
Turbidity Sand filtration will remove which of the following from surface water?
Taste and Odor control Activated Carbon is used in a Surface Water Plant primarily for?
Which of the following chemical(s) are commonly used as coagulants in surface water
Alum and Ferric Chloride
treatment?
Screened Vents Ground storage tanks are required to be provided with which of the following?
An approved locking roof hatch
An overflow pipe with hinged flap device
Annual inspection and maintenance as
needed
Painting An elevated storage tank should be protected against corrosion by-
Cathodic protection
Water stabilization
A public water supply system should maintain residual pressure of 20 psi and a
35 psi
minimum normal operating pressure of-
Before a new or repaired water line is placed into service, it must be properly
50 mg/L
disinfected by providing a chlorine dosage of _____and proper detention time.
Water bearing formations beneath the earth's surface that are used as a source of water
Aquifers
for public water supplies are-
Determine water levels in the well The purpose of an air line on a well is-
The mesh size is an important feature of a well screen because property sized
Reduce the amount of sand pumped
openings should-
pH, alkalinity, temperature, and chemical When treating surface water, the process of coagulation will be most affected by the-
dosage
When the loss of head gauge indicated A rapid sand filter should be backwashed when-
between 6 and 10 ft.
0.2 mg/L free chlorine residual Which of the following is an acceptable disinfection residual at the far reaches of the
0.5 mg/L chloramine residual for a surface distribution system-
water supply
0.8 mg/L chloramine residual when using
chloramine treatment
0.5 mg/L free chlorine residual for a
groundwater supply
8.34 lbs One gallon of water weighs-
One foot of water inside a storage vessel will raise a pressure gauge at the bottom of
.433 lbs
the vessel by-
A raw water intake structure may not be constructed within ____ feet of a boat ramp,
1000 ft
dock, or marina
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