Opflow Cert. Set 10

Front 1

Permanent hardness is

Back 1

the same as non carbonate hardness

Front 2

Chlorite monitoring is required only for system using

Back 2

chlorine dioxide

Front 3

Potassium permanganate is used as an oxidant for controlling

Back 3

Iron and manganese, organic precursors, taste and odor

Front 4

What US Environmental Protection Agency regulation requires consumer confidence reports to be provided to customers?

Back 4

Safe Drinking Water Act, 1996 Amendment

Front 5

How do operators contain the pressurized in a wet tap?

Back 5

Flapper valve

Front 6

Usually, pathogen exposure presents _____rather than _____risk, and if pathogens are detected, it will result in_______

Back 6

acute, chronic, boil-water notices

Front 7

Which gas law states that the rate of diffusion of the gas is inversely proportional to the square root of the gas molecular weight?

Back 7

Graham's law

Front 8

Adding soda ash to sour digester

Back 8

will add less solids loading than lime

Front 9

In a cyclone grit separator, water and lighter particles are carried out in the

Back 9

secondary vortex

Front 10

What affects the disassociation of hypochlorous acid?

Back 10

High pH

Front 11

What type of piping material is corrosion-resistant and lightweight and has a low installation cost but has a low modulus of elasticity?

Back 11

Fiberglass pipe

Front 12

A sample to be analyzed for HAA5 compliance needs to be quenched with

Back 12

ammonium chloride

Front 13

Destruction of pathogenic organisms by chlorine is directly related to

Back 13

chlorine concentration and contact time

Front 14

If respirators are to be worn routinely, the US occupational safety and health administration requires them to be cleaned

Back 14

at least monthly and after each use

Front 15

Which one of the following valves is best to use in throttling flow situations?

Back 15

Globe

Front 16

If the shaft seal is leaking on a mechanical mixture, what would be the most probable cause?

Back 16

Worn or dried-out packing or seal

Front 17

Total Kjeldahi nitrogen is a measure of

Back 17

all organic nitrogen

Front 18

Bacteria in an anaerobic digester will effectively use

Back 18

fats