Opflow Cert. Set 1

Front 1

Which is usually used to disinfect a gravel packing of a groundwater well?

Back 1

Calcium hypochlorite powder or tablet

Front 2

The decomposition products of sodium hypochlorite into chlorate and oxygen would be caused by which factor?

Back 2

Ultraviolet light

Front 3

Diatomaceous earth filters

Back 3

Are used only for water with low turbidity

Front 4

A water tank has a glass tube on its side showing the water level in the tank. What is this level called?

Back 4

Piezometric surface

Front 5

Ball-and-socket joints can provide deflection of up to

Back 5

15 degrees

Front 6

Frequent starting of distribution system pumps probably indicates

Back 6

Inadequate distribution storage

Front 7

Forgotten fire flow, mains smaller than 6 inches should only be used

Back 7

To complete a grid

Front 8

What is the secondary maximum contaminant level for zinc?

Back 8

5 mg/L

Front 9

Jar testing procedures are applicable to

Back 9

Conventional treatment

Front 10

Which is the most probable cause of taste and odors persisting will getting worse when powdered activated carbon (PAC) is used?

Back 10

PAC and chlorine are added too close to each other

Front 11

If the temperature drops below____ ,a 50% solution of caustic soda will begin to crystallize

Back 11

54 degrees Fahrenheit

Front 12

Which type of products would be the most economical to use if large volumes of sodium hypochlorite were required?

Back 12

Centrifugal pumps

Front 13

The lime soda ash softening process best enhance with which other application?

Back 13

Use of a solids-contact unit

Front 14

The radiation term corresponding to an energy absorption of 100 ergs per gram of any medium is called an

Back 14

Rad

Front 15

Is sodium hypochlorite comes into contact with the skin, the affected area should be immediately flush with water for at least

Back 15

15 minutes

Front 16

Which of the following is a measure of materials opposition to the flow of electric current?

Back 16

Ohms

Front 17

How many gallons are in a pipe that is 18 inch in diameter and 1,165 ft long?

Back 17

15,400 gallons

Front 18

If two combining atoms have an electro negativity difference but is more than 1.6,

Back 18

Ionic bonding will occur

Front 19

Many streams would dry up after a rain if it weren't for

Back 19

Groundwater flow

Front 20

The bulk of synthetic organic compounds are

Back 20

Pesticides