Water Treatment Class E Cheat Sheet Exam Ques ons
and answers Newest RATED A+
The minimum distance that a potable water line has to be from a sewer line. - Ans 10 Feet
The minimum distance that a potable water line has to be above a sewer line - Ans 1 Foot
Minimum size coupling for a fire hydrant - Ans 6 inches
How small must a system be in order to be able to collect all TC samples on one day? - Ans
4900 or fewer served
How soon must a + TC sample be resampled - Ans Within 24 hours of the posi*ve result
Where must repeat TC tests be sampled - Ans at the same tap, up and down at most 5 service
connec*ons of the posi*ve result
What must a posi*ve TC sample be checked for? - Ans The presence of FC or EC
Volume of a TC sample - Ans 100 mL
What must be done before pulling a distribu*on sample? - Ans Disinfect the sample point by
torching or chemicals
What is the Popula*on Equivalent? - Ans A means of expressing the amount of organic
material in wastewater. In a domes*c wastewater system, microorganisms use up about 0.2
pound (90 grams) of oxygen per day for each person using the system (as measured by the
standard BOD test). May also be expressed as flow (100 gallons/person/day or 378
liters/person/day) or suspended solids (0.2 lb SS/person/day or 90 grams SS/person/day).
,How do you calculate the popula*on equivalent? - Ans May be expressed as flow (100
gallons/person/day or 378 liters/person/day) or suspended solids (0.2 lb SS/person/day or 90
grams SS/person/day). Use 2 variables to find the missing variable.
Volume of a rectangle - Ans HxWxL
Volume of a cylinder - Ans pi x radius squared x height
how do you fill a line with water? - Ans From the lowest point to the highest point
what concentra*on of Cl2 must be used to disinfect a distribu*on line or tank? - Ans 50 ppm
what is the maximum length of a dead end with a 2 inch line? - Ans 1500 feet
what is a rotameter and what does it measure? - Ans a rotameter is a glass enclosure with a
ball inside used to measure the flow of gas from a cylinder in PPD (pounds per day)
what must you do when star*ng a centrifugal pump? - Ans make sure the suc*on side valve is
open and that the pump is primed
What is Chlorine dose? - Ans The amount of chlorine added to a water supply
what is chlorine demand? - Ans the amount of chlorine required to "make the kill"
What is chlorine residual? - Ans The amount of chlorine leB over aBer the kill
, name the processes of a conven*onal surface water treatment plant - Ans Coagula*on,
floccula*on, sedimenta*on and filtra*on
What is the purpose of The Safe Drinking Water Act? - Ans to protect the public from
waterborne diseases
Name some waterborne diseases - Ans Hepa**s, Anthrax, Dysentery, Cholera, typhoid fever,
giardiasis, gastroenteri*s, meningi*s, polio
What is the purpose of a transformer? - Ans Reduce voltage
Define ampere - Ans A measure of current strength
Define voltage - Ans the electrical pressure available to cause a flow of current when an
electric circuit is closed
What is a WaE - Ans a unit of power
What is an ohm - Ans a unit of electrical resistance
What are the characteris*cs of potable water? - Ans Does not contain objec*onable pollu*on,
contamina*on, minerals or infec*ve agents. Is considered sa*sfactory for drinking
What is the first thing to check when star*ng a gasoline engine? - Ans the oil level / gasoline
level
what is the func*on of a check valve? - Ans To allow water to only move in one direc*on
and answers Newest RATED A+
The minimum distance that a potable water line has to be from a sewer line. - Ans 10 Feet
The minimum distance that a potable water line has to be above a sewer line - Ans 1 Foot
Minimum size coupling for a fire hydrant - Ans 6 inches
How small must a system be in order to be able to collect all TC samples on one day? - Ans
4900 or fewer served
How soon must a + TC sample be resampled - Ans Within 24 hours of the posi*ve result
Where must repeat TC tests be sampled - Ans at the same tap, up and down at most 5 service
connec*ons of the posi*ve result
What must a posi*ve TC sample be checked for? - Ans The presence of FC or EC
Volume of a TC sample - Ans 100 mL
What must be done before pulling a distribu*on sample? - Ans Disinfect the sample point by
torching or chemicals
What is the Popula*on Equivalent? - Ans A means of expressing the amount of organic
material in wastewater. In a domes*c wastewater system, microorganisms use up about 0.2
pound (90 grams) of oxygen per day for each person using the system (as measured by the
standard BOD test). May also be expressed as flow (100 gallons/person/day or 378
liters/person/day) or suspended solids (0.2 lb SS/person/day or 90 grams SS/person/day).
,How do you calculate the popula*on equivalent? - Ans May be expressed as flow (100
gallons/person/day or 378 liters/person/day) or suspended solids (0.2 lb SS/person/day or 90
grams SS/person/day). Use 2 variables to find the missing variable.
Volume of a rectangle - Ans HxWxL
Volume of a cylinder - Ans pi x radius squared x height
how do you fill a line with water? - Ans From the lowest point to the highest point
what concentra*on of Cl2 must be used to disinfect a distribu*on line or tank? - Ans 50 ppm
what is the maximum length of a dead end with a 2 inch line? - Ans 1500 feet
what is a rotameter and what does it measure? - Ans a rotameter is a glass enclosure with a
ball inside used to measure the flow of gas from a cylinder in PPD (pounds per day)
what must you do when star*ng a centrifugal pump? - Ans make sure the suc*on side valve is
open and that the pump is primed
What is Chlorine dose? - Ans The amount of chlorine added to a water supply
what is chlorine demand? - Ans the amount of chlorine required to "make the kill"
What is chlorine residual? - Ans The amount of chlorine leB over aBer the kill
, name the processes of a conven*onal surface water treatment plant - Ans Coagula*on,
floccula*on, sedimenta*on and filtra*on
What is the purpose of The Safe Drinking Water Act? - Ans to protect the public from
waterborne diseases
Name some waterborne diseases - Ans Hepa**s, Anthrax, Dysentery, Cholera, typhoid fever,
giardiasis, gastroenteri*s, meningi*s, polio
What is the purpose of a transformer? - Ans Reduce voltage
Define ampere - Ans A measure of current strength
Define voltage - Ans the electrical pressure available to cause a flow of current when an
electric circuit is closed
What is a WaE - Ans a unit of power
What is an ohm - Ans a unit of electrical resistance
What are the characteris*cs of potable water? - Ans Does not contain objec*onable pollu*on,
contamina*on, minerals or infec*ve agents. Is considered sa*sfactory for drinking
What is the first thing to check when star*ng a gasoline engine? - Ans the oil level / gasoline
level
what is the func*on of a check valve? - Ans To allow water to only move in one direc*on
