Water Treatment Class E Cheat Sheet Exam Questions
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 positive result
Where must repeat TC tests be sampled - Ans at the same tap, up and down at most 5 service
connections of the positive result
What must a positive 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 distribution sample? - Ans Disinfect the sample point by
torching or chemicals
What is the Population Equivalent? - Ans A means of expressing the amount of organic
material in wastewater. In a domestic 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 population 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 concentration of Cl2 must be used to disinfect a distribution 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 starting a centrifugal pump? - Ans make sure the suction 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 left over after the kill
, name the processes of a conventional surface water treatment plant - Ans Coagulation,
flocculation, sedimentation and filtration
What is the purpose of The Safe Drinking Water Act? - Ans to protect the public from
waterborne diseases
Name some waterborne diseases - Ans Hepatitis, Anthrax, Dysentery, Cholera, typhoid fever,
giardiasis, gastroenteritis, meningitis, 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 Watt - Ans a unit of power
What is an ohm - Ans a unit of electrical resistance
What are the characteristics of potable water? - Ans Does not contain objectionable pollution,
contamination, minerals or infective agents. Is considered satisfactory for drinking
What is the first thing to check when starting a gasoline engine? - Ans the oil level / gasoline
level
what is the function of a check valve? - Ans To allow water to only move in one direction
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 positive result
Where must repeat TC tests be sampled - Ans at the same tap, up and down at most 5 service
connections of the positive result
What must a positive 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 distribution sample? - Ans Disinfect the sample point by
torching or chemicals
What is the Population Equivalent? - Ans A means of expressing the amount of organic
material in wastewater. In a domestic 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 population 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 concentration of Cl2 must be used to disinfect a distribution 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 starting a centrifugal pump? - Ans make sure the suction 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 left over after the kill
, name the processes of a conventional surface water treatment plant - Ans Coagulation,
flocculation, sedimentation and filtration
What is the purpose of The Safe Drinking Water Act? - Ans to protect the public from
waterborne diseases
Name some waterborne diseases - Ans Hepatitis, Anthrax, Dysentery, Cholera, typhoid fever,
giardiasis, gastroenteritis, meningitis, 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 Watt - Ans a unit of power
What is an ohm - Ans a unit of electrical resistance
What are the characteristics of potable water? - Ans Does not contain objectionable pollution,
contamination, minerals or infective agents. Is considered satisfactory for drinking
What is the first thing to check when starting a gasoline engine? - Ans the oil level / gasoline
level
what is the function of a check valve? - Ans To allow water to only move in one direction
