Exam (elaborations)
Water Treatment – Questions & Correct Solutions
- Course
- Institution
Water Treatment – Questions & Correct Solutions
[Show more]
Seller
Follow
Studyhall
Reviews received
Content preview
Water Treatment – Questions & Correct SolutionsWhen collecting a distribution-system sample for bacteriological testing,
the person collecting the sample should allow the water to run _______
before filling the sample bottle. Correct Ans - as long as necessary
to clear service line
A chemical commonly used to raise PH is. Correct Ans - Lime.
Black stains on plumbing fixtures might be attributable to. Correct Ans
- Manganese.
One kilogram equals _____ grams. Correct Ans - 1000
The indicator organisms used to determine contamination of drinking
water are. Correct Ans - Coliform group.
The packing around the shaft of a centrifugal pump should be. Correct
Ans - Tightened just enough to allow an occasional drop of liquid to
escape.
The chemical symbol for iron is. Correct Ans - Fe.
One pound per square inch of pressure will raise water ______ ft.
Correct Ans - 2.31
Static head is defined as the. Correct Ans - Pressure due to the
depth or elevation of the water.
What is used to detect chlorine leaks. Correct Ans - 10 percent
solution of ammonia hydroxide.
The pressure gauge reading at the base of a tank filled to a depth of 1ft is
______ psi. Correct Ans - 0.433
The multiple-tube fermentation test consists of three distinct tests. These
tests, in order performed, are the. Correct Ans - Presumptive,
confirmed, and completed tests.
, Chlorine gas is. Correct Ans - 2 1/2 times denser than air.
Polyphosphates may be used in water treatment to retard corrosion and.
Correct Ans - Calcium scale.
Calcium hypochlorite is formulated as a. Correct Ans - Powder.
Chlorine leaks in metal containers tend to. Correct Ans - Become
larger.
Determining the PH of water is one of the important tests of water quality.
The results of the PH test indicate the. Correct Ans - Hydrogen ion
activity.
Leakage from a packing gland should be approximately. Correct Ans -
One drop per second.
A chlorine cylinder valve is thought to be leaking. If ammonia vapor is
passed near the valve. The presence of a leak would be indicated by.
Correct Ans - White smoke.
If a fire hydrant requires a nozzle pressure of 100 psi, what head of water
must be used to supply it? Correct Ans - 231 ft
A water main should be disinfected. Correct Ans - After the pipe is
laid in place.
Carbon dioxide in water will. Correct Ans - Lower pH.
A pneumatic ejector lifts water from low points to higher levels. The device
used to achieve this is a(n). Correct Ans - Air compressor.
Pressure is commonly measured in. Correct Ans - Pounds per
square inch.
Mechanical seals are being installed in pumps because. Correct Ans -
Packing requires an undesirable leakage that seals eliminate.
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 $12.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77254 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now