Exam (elaborations)
Class D Water Operator: Questions With Complete Answers (Rated A+)
- Course
- Institution
Class D Water Operator: Questions With Complete Answers (Rated A+)
[Show more]
Seller
Follow
Studyhall
Reviews received
Content preview
Class D Water Operator: Questions With CompleteAnswers (Rated A+)
What are some physical characteristics of water? Right Ans - Temperature,
turbidity, color, taste, odor
What are some chemical characteristics of water? Right Ans - Hardness,
pH, solids, and gases
What is turbidity? Right Ans - the amount of suspended matter, such as
clay, silt, organic matter, and microorganisms in water
T/F Water is never found pure in nature. Right Ans - True
Is turbidity more of a problem in groundwater or surface water? Right Ans
- 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. Right Ans - 0.3
1
T/F True color is dissolved in water (in solution) and cannot be removed by
filtering. Right Ans - True. Tea in water is an example of true color.
Suspended color is called _______ color. Right Ans - apparent
Color above ______ units is objectionable in a public water supply. Right Ans
- 15 units
A scale called the ________ measures odor. Right Ans - Threshold Odor
Number (TON)
Odor greater than a scale of _______ is undesirable. Right Ans - 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. Right Ans - algae
, Chemical characteristics of water generally cannot be detected by sight, smell,
or taste and must be determined by __________. Right Ans - laboratory
analysis
Chemical laboratory analysis must be sampled _______ per year for surface
water and normally _______ for groundwater. Right Ans - once/year for
surface water
once every three years for groundwater
Water weighs ______ lbs/gal. Right Ans - 8.34 lbs/gal
T/F
For water, 1 mg/L is equal to 1 part per million (ppm) by weight. Right Ans
- True
Which two minerals mainly cause hardness in water? Right Ans - Calcium
and magnesium
Is hardness more of a problem in groundwater or surface water? Right Ans
- Groundwater
Water is considered hard when it exceeds _______. Right Ans - 100 mg/L of
calcium carbonate
The pH scale ranges from _____ to _____. Right Ans - 0 to 14
On the pH scale:
0 to <7 is ______.
7 is _______.
>7 to 14 is ______. Right Ans - 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. Right Ans - Lower
Raise
Suspended solids can be removed by ________. Right Ans - Filtration
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller Studyhall. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
72042 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now