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Water Treatment – Questions & Correct Solutions
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Water Treatment – Questions & Correct Solutions
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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.
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