Opflow Cert. Set 5

Front 1

What type of substances will pass through plastic pipe?

Back 1

Organics

Front 2

Ductile iron pipe resembles what other type of pipe?

Back 2

Cast-iron pipe

Front 3

Both_______and______customers dislike day today changes in hardness, taste, temperature, or chemical composition.

Back 3

Industrial, domestic

Front 4

How are the metal parts on concrete pipe protected from corrosion?

Back 4

Mortar

Front 5

Iron and manganese in raw water are generally_______, reduce, and in the______

Back 5

soluble, divalent state

Front 6

Ammonia is a dangerous gas and is readily detectable at concentrations of

Back 6

20 to 50 ppm

Front 7

In a lead-acid battery, each of the battery cells produces an open circuit voltage of approximately

Back 7

2.1 volts

Front 8

What important role do system operators play in water utility's management pipeline Rehabilitation and replacement program?

Back 8

Setting renewal priorities

Front 9

Methane-producing bacteria require a pH level within the sludge ranging from 6 to 7

Back 9

6.5 to 7.5

Front 10

What water treatment process is occurring if chemicals and water are being slowly mixed?

Back 10

Coagulation

Front 11

Secondary standard for TDS of _____. TDS is a gross measure of the______ of the water because _____substances are usually a minor part of the total.

Back 11

500 mg7 liter, inorganic, organic

Front 12

Exhaust fan switches for chlorine feed room should be wired to_____in the room.

Back 12

Emergency lights

Front 13

Coliform bacteria will produce gas in______ broth at______ within blank

Back 13

lactose or laurel tryptoes, 35.5, celsius, 24 to 48 hours

Front 14

A double replacement reaction is the same as

Back 14

An ionic reaction

Front 15

Microorganisms that are methane fermenters producing a PH range of

Back 15

6.6 to 7.6

Front 16

What does service line size primarily depend on?

Back 16

Elevation difference between main and the highest building point serve

Front 17

Standards for tapping_____have been withdrawn by AWWA

Back 17

Asbestos-cement

Front 18

The amount of current on a buried pipe is _______ pretty electrical resistivity of the soil.

Back 18

inversely proportional

Front 19

What's the most common radionuclide anion?

Back 19

Uranium

Front 20

Why is ozone treatment often followed by granu activated carbon?

Back 20

To prevent the regrowth of bacteria in the distribution system