Wastewater Practice exam questions
and answers 100% pass
When organic wastes are discharged to receiving waters, O2 is depleted by _____. ✔✔bacteria
Hydrogen sulfide gives off an odor similar to____. ✔✔rotten eggs
3 diseases potentially carried by wastewater are _____. ✔✔typhoid fever, disentery, cholera
Immediate first aid for butrns is to ____. ✔✔flood with cold water
What most likely causes an electic motor failure? ✔✔mopisture
What mixed liquor characteristics indicate a healthy activated sludge process? ✔✔brown color,
frothy appearance, and musty odor
T/F: Algae is a plant life necessary for the proper functioning of a stabilization or oxidation
pond. ✔✔True
, Chlorine gas is ? ✔✔heavier than air
T/F: The highest concentration of algae growth in a facultative lagoon is usually observed near
the top. ✔✔True
Common hydraulic detention times for primary clarifiers range from ____ hours ✔✔2 - 3 hours
T/F: Methane is produced in an anaeroibic digester and can be used as a fuel? ✔✔True
T/F: The rock in a trickling filter is usually placed on a tile underdrain system. ✔✔True
What is the purpose of heating and mixing a primary anaeroibic digester? ✔✔to increase the
digestion rate
T/F: Exhaust from a chlorinator room should be taken form floor level. ✔✔True
T/F: Chlorine residual may be determined using the reagent _____ ✔✔diethyl-p-phenylene
diamine (DPD)
and answers 100% pass
When organic wastes are discharged to receiving waters, O2 is depleted by _____. ✔✔bacteria
Hydrogen sulfide gives off an odor similar to____. ✔✔rotten eggs
3 diseases potentially carried by wastewater are _____. ✔✔typhoid fever, disentery, cholera
Immediate first aid for butrns is to ____. ✔✔flood with cold water
What most likely causes an electic motor failure? ✔✔mopisture
What mixed liquor characteristics indicate a healthy activated sludge process? ✔✔brown color,
frothy appearance, and musty odor
T/F: Algae is a plant life necessary for the proper functioning of a stabilization or oxidation
pond. ✔✔True
, Chlorine gas is ? ✔✔heavier than air
T/F: The highest concentration of algae growth in a facultative lagoon is usually observed near
the top. ✔✔True
Common hydraulic detention times for primary clarifiers range from ____ hours ✔✔2 - 3 hours
T/F: Methane is produced in an anaeroibic digester and can be used as a fuel? ✔✔True
T/F: The rock in a trickling filter is usually placed on a tile underdrain system. ✔✔True
What is the purpose of heating and mixing a primary anaeroibic digester? ✔✔to increase the
digestion rate
T/F: Exhaust from a chlorinator room should be taken form floor level. ✔✔True
T/F: Chlorine residual may be determined using the reagent _____ ✔✔diethyl-p-phenylene
diamine (DPD)
