Water supply Mid term

Question 1

A drilled well draws it’s water from a(n):

Answer 1

aquifer

Question 2

a residential well using a submersible pump would normally have a casing ____ inches in diameter:

Answer 2

4”

Question 3

the distance in feet or meters that water lowers when the well is being pumped is defined as:

Answer 3

Drawdown

Question 4

What is the minimum grade of polyethylene pipe approved for use as a pump drop pipe

Answer 4

series 160

Question 5

the rate at which water flows into a well from its supplying aquifer is defined as:

restores the deplested water from drawdown

Answer 5

Recovery rate

Question 6

a shallow well is normally defined as being no more than _____ feet deep:

Answer 6

25’

Question 7

the amount a well is capable of supplying in GPM at a given time is defined as:

Answer 7

well yield

Question 8

A device for storing water (usually underground) is defined as a:

Answer 8

Cistern

Question 9

which of the following determines when the pump starts and stops:

Answer 9

pressure switch

Question 10

the most common type of pump used in private water supply systems is:

Answer 10

Centrifugal

Question 11

According to your modules, each stage of a submersible pump will produce ____ psi:

Answer 11

9 psi

Question 12

what is the daily water requirement per person (us gal) used when sizing private water supply?

Answer 12

60

Question 13

A spring will always supply high quality water:

Answer 13

false

Question 14

Water from a well should be tested to ensure it is potable a minimum of:

Answer 14

once a year

Question 15

as high velocity water leaves the impeller vanes and enters the volute, it slows and changes to:

Answer 15

high pressure

Question 16

centrifugal pumps that are in series will result in:

Answer 16

increased pressure

Question 17

The maximum practical suction lift at sea level is:

Answer 17

25’

Question 18

the maximum practical suction lift at 2000’ above sea level is:

Answer 18

23

Subtract 1psi from 25 psi for every 1000’ above sea level

Question 19

the amount of pressure an impeller will produce is mainly a function of its:

Answer 19

Diameter

Pressure = diameter

Question 20

the amount of flow an impeller will produce is mainly a function of its:

Answer 20

width

floW
I
D
T
H

Question 21

centrifugal pumps are classified as what type of pump:

Answer 21

Variable displacement

Question 22

a Pump that will lift water 345 feet will develop a pressure of ____ psi:

Answer 22

149.39

345’ x .433 psi = 149.39

Question 23

which type of pressure tank would use an air volume control?

Answer 23

standard

Question 24

a pressure switch usually has a pressure differential setting of _____ psi:

Answer 24

20psi

Question 25

a centrifugal pump should cycle no more than ____ times per hour:

Answer 25

25

Question 26

what type of pump would be best suited for fuel transfer use?

Answer 26

diaphragm

Question 27

what type of pump would be best suited to move body fluids in a hospital setting?

Answer 27

peristaltic

Question 28

what type of pump would best be suited to add chlorine to a water system?

Answer 28

metering

Question 29

sewage pumps generally use what type of impeller?

Answer 29

open

Question 30

a centrifugal pump works on the ________ principle

Answer 30

Bernoulli’s

Question 31

the pressure relief valve in a private centrifugal water supply system should be set _____ psi above cut out pressure:

Answer 31

10

Question 32

a pump that sounds like it has marbles running it is most likely:

Answer 32

in cavitation

Question 33

As high pressure water enters the ejector of a jet pump, it passes thru the ____ and is converted to High velocity water:

Answer 33

venturi

Question 34

What converts the high velocity water in a jet pump ejector to high pressure water?

Answer 34

venturi

Question 35

the larger of the two pipes on a deep well jet pump is the ____ line:

Answer 35

suction

SUCTION = OPEN WIDE KIRBY STYLE

Question 36

A pressure expressed in terms of a height of column of fluid in feet is defined as:

Answer 36

head

Question 37

what is the most likely cause of a pump turning on every time there is a demand for water?

Answer 37

pressure tank waterlogged

Question 38

the minimum size of a pressure tank for agricultural applications is ____ gallons:

Answer 38

42

Question 39

normal pressure switch settings for residential use are:

Answer 39

30-50 psi

Question 40

flow rates for pumps are normally expressed as:

Answer 40

US gpm

Question 41

a vacuum reading 1”hg will lift water:

Answer 41

1.13 ft of head

Question 42

A vacuum gauge on the suction side of a running pump would show _____ ______ if the foot valve was stuck close:

Answer 42

high vacuum

Question 43

A vacuum gauge on the suction side of running the pump would show ____ ____ if there was a large hole in the drop pipe above the waterline:

Answer 43

low vacuum

Question 44

what is the correct ratio of air to water in a standard pressure tank?

Answer 44

1/3 air to 2/3 water

Question 45

what prevents the water from draining out of the drop pipe when the pump stops running?

Answer 45

foot valve

Question 46

pressure tanks are sized so that the pump will run for a minimum of ____ minutes:

Answer 46

2.4 mins

Question 47

private water systems are designed to provide the required amount of water:

Answer 47

during peak demand

Question 48

the NFPA recommends a minimum supply of _____ gallons of water for 2 hours for fire fighting purposes:

Answer 48

1200 gallons for 2 hours

Question 49

water from a dug out must always be _____ prior to human consumption

Answer 49

treated