Wastewater Operator Exam TN
questions well answered to pass
Algae - correct answer ✔✔Which of the following is not likely to develop if wastewater remains
int eh collection system too long?
Ammonia - correct answer ✔✔A high sewage pH can result int production of toxic gases due
to :
Odor and oxygen demand - correct answer ✔✔What problems do septic conditions in the
collection system cause at the treatment plant?
Broken and loose terminal connections
Shaft binding or sticking
Motor shorted or burned out - correct answer ✔✔If a lift station pump will not start what do
you check?
Hydrogen sulfide level increases - correct answer ✔✔The amount of iron salts fed to the
collection system should be increased whenever the:
At a specified location in the convergence of the flume - correct answer ✔✔Where should the
flow meter sensor be located at the parshall flume?
Primary application: pipelines, round bottom channels, manholes where it is often preferred
because the cost and ease of installation that can minimize construction expense - correct
answer ✔✔What/where is the palmer bowlus flume used in wastewater?
,It operates partially full - correct answer ✔✔Which of the following statements is not true
concerning the operation of a magnetic flow meter?
Measure area and velocity in an open channel
Measure how long it takes to fill a 55 gallon drum
Measure how long it takes to fill a tank - correct answer ✔✔What methods can be used to
check the performance of a flow meter?
Activated sludge - correct answer ✔✔On what type of treatment process do hydraulic flow
variations have the greatest impact?
As flow increases, detention time decreases - correct answer ✔✔What is important to
understand about the impact of high flow on treatment units?
Increase in oxygen concentration in the aeration basin - correct answer ✔✔What is the first
indication that a strong toxic industrial substance has entered the activated sludge plant?
Drag shields and shoring - correct answer ✔✔Which type of cave in protection provides the
best and most practical way to protect workers in deep excavations?
Vulnerabilities - correct answer ✔✔How do manholes, lift stations, and other features
associated with collections/treatment systems would be viewed from a risk assessment point of
view?
Mercaptan - correct answer ✔✔Which of the following is an offensive smelling gas found in
wastewater treatment plants?
Airborne sludge particles - correct answer ✔✔Workers in a sludge composting operation should
wear respiratory protection because the compost can give off:
,Supplied air respirator - correct answer ✔✔What safety equipment should an operator use in
areas containing gaseous and particulate contaminants?
Class C - correct answer ✔✔Which type of fire extinguisher should be used for an electrical fire?
Recognition of hazards, evaluation of hazards, and control of hazards - correct answer ✔✔An
accident prevention program in generate involves which of the following sets of steps?
After every use - correct answer ✔✔How often should fire extinguisher be recharged?
Mercury - correct answer ✔✔Which of the following can poison the atmosphere in a room and
should always be handled with special care?
8 hour (TWA) of 85 decibels - correct answer ✔✔What is the danger level as defined by federal
refs, to individuals whose normal noise exposure might equal or exceed this dangerous level
Flow equalization - correct answer ✔✔Widely fluctuating hydraulic flows may require which of
the following?
Increase sludge wasting - correct answer ✔✔If you noticed poor solids settling in the clarifier
and solids overflow into the chlorine contact chamber, what would you do if the dilated
settleometer showed improved settling??
Biological activity slows down, viscosity of the H2O increases, solids settle slow - correct answer
✔✔As temperature decreases under normal conditions which are the following effect
Decrease in solids settling efficiency
, More oxygen in the solution - correct answer ✔✔How does a water temperature decrease
affect aerobic biological processes?
0.06 - 0.25 inches - correct answer ✔✔Fine screens typically consist of wedge wire, perforated
plate, or closely spaced bars with openings in what range?
Do not dam the flow - correct answer ✔✔One advantage of rotating screens over stationary
screens is that rotating screens generally
To lower the specific gravity of water - correct answer ✔✔What is the purpose of injecting
diffused air into aerated grit chambers?
Grit is removed
Grit is washed
Wastewater is freshened - correct answer ✔✔What is accomplished by an aerated grit
chamber?
Cyclone inlet pressure too low.
Increase the inlet pressure by adjusting the grit pump discharge - correct answer ✔✔When
using cyclones at the end of a grit removal process what will cause a decrease in grit removal
efficiency in the cyclone?
Check the motor and look for blockage
Cut off the electricity
Lock out and tag the breaker
Place the bar screen into service - correct answer ✔✔What should an operator do if the
communicator is not operating properly?
Continuously - correct answer ✔✔How often should communicators be operated?
questions well answered to pass
Algae - correct answer ✔✔Which of the following is not likely to develop if wastewater remains
int eh collection system too long?
Ammonia - correct answer ✔✔A high sewage pH can result int production of toxic gases due
to :
Odor and oxygen demand - correct answer ✔✔What problems do septic conditions in the
collection system cause at the treatment plant?
Broken and loose terminal connections
Shaft binding or sticking
Motor shorted or burned out - correct answer ✔✔If a lift station pump will not start what do
you check?
Hydrogen sulfide level increases - correct answer ✔✔The amount of iron salts fed to the
collection system should be increased whenever the:
At a specified location in the convergence of the flume - correct answer ✔✔Where should the
flow meter sensor be located at the parshall flume?
Primary application: pipelines, round bottom channels, manholes where it is often preferred
because the cost and ease of installation that can minimize construction expense - correct
answer ✔✔What/where is the palmer bowlus flume used in wastewater?
,It operates partially full - correct answer ✔✔Which of the following statements is not true
concerning the operation of a magnetic flow meter?
Measure area and velocity in an open channel
Measure how long it takes to fill a 55 gallon drum
Measure how long it takes to fill a tank - correct answer ✔✔What methods can be used to
check the performance of a flow meter?
Activated sludge - correct answer ✔✔On what type of treatment process do hydraulic flow
variations have the greatest impact?
As flow increases, detention time decreases - correct answer ✔✔What is important to
understand about the impact of high flow on treatment units?
Increase in oxygen concentration in the aeration basin - correct answer ✔✔What is the first
indication that a strong toxic industrial substance has entered the activated sludge plant?
Drag shields and shoring - correct answer ✔✔Which type of cave in protection provides the
best and most practical way to protect workers in deep excavations?
Vulnerabilities - correct answer ✔✔How do manholes, lift stations, and other features
associated with collections/treatment systems would be viewed from a risk assessment point of
view?
Mercaptan - correct answer ✔✔Which of the following is an offensive smelling gas found in
wastewater treatment plants?
Airborne sludge particles - correct answer ✔✔Workers in a sludge composting operation should
wear respiratory protection because the compost can give off:
,Supplied air respirator - correct answer ✔✔What safety equipment should an operator use in
areas containing gaseous and particulate contaminants?
Class C - correct answer ✔✔Which type of fire extinguisher should be used for an electrical fire?
Recognition of hazards, evaluation of hazards, and control of hazards - correct answer ✔✔An
accident prevention program in generate involves which of the following sets of steps?
After every use - correct answer ✔✔How often should fire extinguisher be recharged?
Mercury - correct answer ✔✔Which of the following can poison the atmosphere in a room and
should always be handled with special care?
8 hour (TWA) of 85 decibels - correct answer ✔✔What is the danger level as defined by federal
refs, to individuals whose normal noise exposure might equal or exceed this dangerous level
Flow equalization - correct answer ✔✔Widely fluctuating hydraulic flows may require which of
the following?
Increase sludge wasting - correct answer ✔✔If you noticed poor solids settling in the clarifier
and solids overflow into the chlorine contact chamber, what would you do if the dilated
settleometer showed improved settling??
Biological activity slows down, viscosity of the H2O increases, solids settle slow - correct answer
✔✔As temperature decreases under normal conditions which are the following effect
Decrease in solids settling efficiency
, More oxygen in the solution - correct answer ✔✔How does a water temperature decrease
affect aerobic biological processes?
0.06 - 0.25 inches - correct answer ✔✔Fine screens typically consist of wedge wire, perforated
plate, or closely spaced bars with openings in what range?
Do not dam the flow - correct answer ✔✔One advantage of rotating screens over stationary
screens is that rotating screens generally
To lower the specific gravity of water - correct answer ✔✔What is the purpose of injecting
diffused air into aerated grit chambers?
Grit is removed
Grit is washed
Wastewater is freshened - correct answer ✔✔What is accomplished by an aerated grit
chamber?
Cyclone inlet pressure too low.
Increase the inlet pressure by adjusting the grit pump discharge - correct answer ✔✔When
using cyclones at the end of a grit removal process what will cause a decrease in grit removal
efficiency in the cyclone?
Check the motor and look for blockage
Cut off the electricity
Lock out and tag the breaker
Place the bar screen into service - correct answer ✔✔What should an operator do if the
communicator is not operating properly?
Continuously - correct answer ✔✔How often should communicators be operated?
