UTA5 Water Treatment & Purification

Question 1

A total of how many gallons per minute are flowing in a stream that is 10 feet wide and has an average depth of 3 feet when the water is flowing at a velocity of 15 feet per minute?

Answer 1

Q=6.4 x A x V

Q=6.4 x (3x10) x 15

Q=6.4 x 30 x 15

Q= 2,880

Question 2

The strainer on a suction hose should be placed a total of how many inches under the water level?

Answer 2

4

Question 3

What is the purpose of a jar test?

Answer 3

To indicate what chemical is necessary for coagulation

Question 4

Water produced by distillation equipment should NOT be used for what purpose?
A. Fire protection
B. Vehicle washing
C. Galley scrubbing
D. Personal cleanliness

Answer 4

A. Fire protection

Question 5

What term is used to describe a water source developed for military use?

Answer 5

Water point

Question 6

Compute the quantity of water in a lake that is 100 feet long, 20 feet wide, has an average depth of 6 feet, and no run off.

Answer 6

Q = A x D x 7.5

Q = (100 x 20) x 7 x 7.5

Q = 2000 x 7 x 7.5

Q = 90,000 gallons

Question 7

Which of the following types of sand provides the greatest rate of flow during drawdown?

Answer 7

Coarse sand with grains nearly uniform in size

Question 8

The pump and power unit used for testing a well should be capable of continuous operation for a minimum of how many hours?

Answer 8

24

Question 9

What are the two classifications of water impurities?

Answer 9

Suspended or dissolved

Question 10

What data, if any, should you study to determine the variation in reliability that may be expected at a water source?

Answer 10

Geological

Question 11

A temporary water source should not be converted into a permanent water source until after what activity has taken place?

Answer 11

An area search for a source requiring less development

Question 12

For a normal field water supply, what type of water source is the most accessible?

Answer 12

Surface

Question 13

In a swiftly flowing stream, what type of dam can be constructed to protect an intake screen without impounding the water?

Answer 13

Wing or baffle dam

Question 14

The quality of water from a muddy stream can be improved in which of the following ways?

Answer 14

By building intake galleries

Question 15

Moisture is held beneath the surface of the earth in what total number of zones?

Answer 15

Three
Soil
Aeration/ percolation
Saturation

Question 16

In a driven well, the sections of well pipe are delivered in lengths of what size?

Answer 16

5 feet

Question 17

When developed properly, springs yielding a minimum of how many gallons per minute can be used as a source of field water?

Answer 17

20 Gallons

Question 18

There is a total of how many classifications of wells?

Answer 18

5

(1) Dug
(2) Bored
(3) Driven
(4) Jetted
(5) Drilled

Question 19

A well that is dug is usually 3 feet in diameter or more and within what depth range?

Answer 19

20’ to 40’

Question 20

A well can normally be bored within what maximum depth without fear of a cave- in?

Answer 20

60’

25’ minimum

Question 21

When jetting a well, you turn the jet or drill slowly for what purpose?

Answer 21

To ensure the hole is straight

Question 22

When a well is driven, the drive points are within what size range?

Answer 22

1 1/4 inches to 2 inches

Question 23

To guard against subsurface contamination, you should locate rainwater catchment areas at what minimum distance from possible sources of contamination?

Answer 23

100 feet

Question 24

What minimum treatment is required for collected rainwater that is to be used as a water source?

Answer 24

Filtration and disinfection

Question 25

A total of how many cubic feet of snow is required to produce 1 cubic foot of water?

Answer 25

5

Question 26

Which of the following chemicals can be used to prevent the formation of algae in raw water supply points?
A. Chlorine
B. Copper sulfate
C. Activated carbon
D. Each of the above

Answer 26

D. Each of the above

Question 27

What term accurately describes a muddy or unclear condition of water caused by sand, clay, or organic matter?

Answer 27

Turbidity

Question 28

To treat 1,000 gallons of water, you should use approximately how many ounces of activated carbon?

Answer 28

1

Question 29

When you are using copper sulfate to treat a lake, concentrations of organisms should never exceed how many parts per million to protect the lives of fish?

Answer 29

2

Question 30

You should reduce the water treatment rate when the outside temperature reaches what level?

Answer 30

Less than 45°F

Question 31

The total concentration of manganese in potable water should not exceed how many parts per million?

Answer 31

0.3

Question 32

The ion exchange unit removes which of the following undesirable properties of water?

Answer 32

Manganese and lead

Question 33

Dissolved gases can be removed from a water supply by what means?

Answer 33

Aeration
OR
Activated carbon

Question 34

A water source with a pH value less than what number is an indication of possible CBR contamination?

Answer 34

5.0

Question 35

What water test kit does medical use to check a water source for chemical contamination?

Answer 35

M272

Question 36

What is the name of the process whereby latent heat is removed and steam becomes water?

Answer 36

Condensation

Question 37

The compressor in a thermal compression distillation unit raises the temperature of the steam from 212°F to what temperature?

Answer 37

222°F

Question 38

What type of treatment is used in residual disinfection as the final step in the water treatment process?

Answer 38

Chlorination

Question 39

What minimum amount of residual chlorine is considered significant?

Answer 39

0.1 ppm

Question 40

What standard period of contact time is required for disinfection purposes to kill disease-producing organisms?

Answer 40

30 minutes