Class D Water Operator Questions And Answers Rated A+.
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Course
Class D Water Operator
Institution
Class D Water Operator
Class D Water Operator Questions And Answers Rated A+.
What are some physical characteristics of water? - correct answer. Temperature, turbidity, color, taste, odor
What are some chemical characteristics of water? - correct answer. Hardness, pH, solids, and gases
What is turb...
Class D Water Operator Questions And
Answers Rated A+.
What are some physical characteristics of water? - correct answer. Temperature,
turbidity, color, taste, odor
What are some chemical characteristics of water? - correct answer. Hardness, pH,
solids, and gases
What is turbidity? - correct answer. the amount of suspended matter, such as clay,
silt, organic matter, and microorganisms in water
T/F Water is never found pure in nature. - correct answer. True
Is turbidity more of a problem in groundwater or surface water? - correct answer.
Surface water
A system's filtered water must be _______ Nephelometric Turbidity Units (NTU) or less
in at least 95% of the measurements taken each month, and no sample can exceed
_____ NTU. - correct answer. 0.3
1
T/F True color is dissolved in water (in solution) and cannot be removed by filtering. -
correct answer. True. Tea in water is an example of true color.
Suspended color is called _______ color. - correct answer. apparent
Color above ______ units is objectionable in a public water supply. - correct answer.
15 units
A scale called the ________ measures odor. - correct answer. Threshold Odor
Number (TON)
Odor greater than a scale of _______ is undesirable. - correct answer. 3
, Taste and odors in water result from _______, bacteria, decaying organic matter,
gases, and chemicals such as manganese, zinc, copper, iron, magnesium, sodium, and
potassium. - correct answer. algae
Chemical characteristics of water generally cannot be detected by sight, smell, or taste
and must be determined by __________. - correct answer. laboratory analysis
Chemical laboratory analysis must be sampled _______ per year for surface water and
normally _______ for groundwater. - correct answer. once/year for surface water
once every three years for groundwater
Water weighs ______ lbs/gal. - correct answer. 8.34 lbs/gal
T/F
For water, 1 mg/L is equal to 1 part per million (ppm) by weight. - correct answer. True
Which two minerals mainly cause hardness in water? - correct answer. Calcium and
magnesium
Is hardness more of a problem in groundwater or surface water? - correct answer.
Groundwater
Water is considered hard when it exceeds _______. - correct answer. 100 mg/L of
calcium carbonate
The pH scale ranges from _____ to _____. - correct answer. 0 to 14
On the pH scale:
0 to <7 is ______.
7 is _______.
>7 to 14 is ______. - correct answer. Acidic
Neutral
Basic or alkaline
Sulfuric, hydrochloric, and nitric acids can be used to ______ pH.
Caustic, lime, or soda ash can be used to ______ pH. - correct answer. Lower
Raise
Suspended solids can be removed by ________. - correct answer. Filtration
Can dissolved solids be removed by filtration? - correct answer. No
Total dissolved solids should not exceed________. - correct answer. 1000 mg/L
What are three common gasses found in water? - correct answer. Hydrogen sulfide,
carbon dioxide, and methane
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