Water Treatment Class E Cheat Sheet Exam
Latest Solution
The minimum distance that a potable water line has to be from a sewer line. - ✔✔✔ - 10 Feet
The minimum distance that a potable water line has to be above a sewer line - ✔✔✔ - 1 Foot
Minimum size coupling for a fire hydrant - ✔✔✔ - 6 inches
How small must a system be in order to be able to collect all TC samples on one day? - ✔✔✔ - 4900
or fewer served
How soon must a + TC sample be resampled - ✔✔✔ - Within 24 hours of the positive result
Where must repeat TC tests be sampled - ✔✔✔ - 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? - ✔✔✔ - The presence of FC or EC
Volume of a TC sample - ✔✔✔ - 100 mL
What must be done before pulling a distribution sample? - ✔✔✔ - Disinfect the sample point by
torching or chemicals
What is the Population Equivalent? - ✔✔✔ - 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? - ✔✔✔ - 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 - ✔✔✔ - HxWxL
Volume of a cylinder - ✔✔✔ - pi x radius squared x height
How do you fill a line with water? - ✔✔✔ - From the lowest point to the highest point
What concentration of Cl2 must be used to disinfect a distribution line or tank? - ✔✔✔ - 50 ppm
What is the maximum length of a dead end with a 2 inch line? - ✔✔✔ - 1500 feet
What is a rotameter and what does it measure? - ✔✔✔ - 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? - ✔✔✔ - make sure the suction side valve is
open and that the pump is primed
What is Chlorine dose? - ✔✔✔ - The amount of chlorine added to a water supply
What is chlorine demand? - ✔✔✔ - the amount of chlorine required to "make the kill"
What is chlorine residual? - ✔✔✔ - The amount of chlorine left over after the kill
Name the processes of a conventional surface water treatment plant - ✔✔✔ - Coagulation,
flocculation, sedimentation and filtration
, What is the purpose of The Safe Drinking Water Act? - ✔✔✔ - to protect the public from waterborne
diseases
Name some waterborne diseases - ✔✔✔ - Hepatitis, Anthrax, Dysentery, Cholera, typhoid fever,
giardiasis, gastroenteritis, meningitis, and polio
What is the purpose of a transformer? - ✔✔✔ - Reduce voltage
Define ampere - ✔✔✔ - A measure of current strength
Define voltage - ✔✔✔ - the electrical pressure available to cause a flow of current when an electric
circuit is closed
What is a Watt - ✔✔✔ - a unit of power
What is an ohm - ✔✔✔ - a unit of electrical resistance
What are the characteristics of potable water? - ✔✔✔ - 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? - ✔✔✔ - the oil level / gasoline level
What is the function of a check valve? - ✔✔✔ - To allow water to only move in one direction
What should the drip rate of the packing gland on a centrifugal pump, which has rope packing be? -
✔✔✔ - a drop/second or 60 drops/minute
Name the symbols for these elements:
Iron, Calcium, Lead, Carbon, Hydrogen, arsenic, barium, cadmium, chromium, mercury, selenium,
silver, Fluorine, Nitrogen, chlorine - ✔✔✔ - Fe, Ca, Pb, C, H, As, Ba, Cd, Cr, Hg, Se, Ag, F, N, Cl
Latest Solution
The minimum distance that a potable water line has to be from a sewer line. - ✔✔✔ - 10 Feet
The minimum distance that a potable water line has to be above a sewer line - ✔✔✔ - 1 Foot
Minimum size coupling for a fire hydrant - ✔✔✔ - 6 inches
How small must a system be in order to be able to collect all TC samples on one day? - ✔✔✔ - 4900
or fewer served
How soon must a + TC sample be resampled - ✔✔✔ - Within 24 hours of the positive result
Where must repeat TC tests be sampled - ✔✔✔ - 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? - ✔✔✔ - The presence of FC or EC
Volume of a TC sample - ✔✔✔ - 100 mL
What must be done before pulling a distribution sample? - ✔✔✔ - Disinfect the sample point by
torching or chemicals
What is the Population Equivalent? - ✔✔✔ - 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? - ✔✔✔ - 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 - ✔✔✔ - HxWxL
Volume of a cylinder - ✔✔✔ - pi x radius squared x height
How do you fill a line with water? - ✔✔✔ - From the lowest point to the highest point
What concentration of Cl2 must be used to disinfect a distribution line or tank? - ✔✔✔ - 50 ppm
What is the maximum length of a dead end with a 2 inch line? - ✔✔✔ - 1500 feet
What is a rotameter and what does it measure? - ✔✔✔ - 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? - ✔✔✔ - make sure the suction side valve is
open and that the pump is primed
What is Chlorine dose? - ✔✔✔ - The amount of chlorine added to a water supply
What is chlorine demand? - ✔✔✔ - the amount of chlorine required to "make the kill"
What is chlorine residual? - ✔✔✔ - The amount of chlorine left over after the kill
Name the processes of a conventional surface water treatment plant - ✔✔✔ - Coagulation,
flocculation, sedimentation and filtration
, What is the purpose of The Safe Drinking Water Act? - ✔✔✔ - to protect the public from waterborne
diseases
Name some waterborne diseases - ✔✔✔ - Hepatitis, Anthrax, Dysentery, Cholera, typhoid fever,
giardiasis, gastroenteritis, meningitis, and polio
What is the purpose of a transformer? - ✔✔✔ - Reduce voltage
Define ampere - ✔✔✔ - A measure of current strength
Define voltage - ✔✔✔ - the electrical pressure available to cause a flow of current when an electric
circuit is closed
What is a Watt - ✔✔✔ - a unit of power
What is an ohm - ✔✔✔ - a unit of electrical resistance
What are the characteristics of potable water? - ✔✔✔ - 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? - ✔✔✔ - the oil level / gasoline level
What is the function of a check valve? - ✔✔✔ - To allow water to only move in one direction
What should the drip rate of the packing gland on a centrifugal pump, which has rope packing be? -
✔✔✔ - a drop/second or 60 drops/minute
Name the symbols for these elements:
Iron, Calcium, Lead, Carbon, Hydrogen, arsenic, barium, cadmium, chromium, mercury, selenium,
silver, Fluorine, Nitrogen, chlorine - ✔✔✔ - Fe, Ca, Pb, C, H, As, Ba, Cd, Cr, Hg, Se, Ag, F, N, Cl
