Wastewater Operator Exam TN Pre Questions And 100% Accurate Answers.
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Course
Tennessee septic installer license
Institution
Tennessee Septic Installer License
Which of the following is not likely to develop if wastewater remains int eh collection system too long? - Answer Algae
A high sewage pH can result int production of toxic gases due to : - Answer Ammonia
What problems do septic conditions in the collection system cause at the treatment ...
Wastewater Operator Exam TN Pre
Questions And 100% Accurate Answers.
Which of the following is not likely to develop if wastewater remains int eh collection system too long? -
Answer Algae
A high sewage pH can result int production of toxic gases due to : - Answer Ammonia
What problems do septic conditions in the collection system cause at the treatment plant? - Answer
Odor and oxygen demand
If a lift station pump will not start what do you check? - Answer Broken and loose terminal connections
Shaft binding or sticking
Motor shorted or burned out
The amount of iron salts fed to the collection system should be increased whenever the: - Answer
Hydrogen sulfide level increases
Where should the flow meter sensor be located at the parshall flume? - Answer At a specified location
in the convergence of the flume
What/where is the palmer bowlus flume used in wastewater? - Answer Primary application: pipelines,
round bottom channels, manholes where it is often preferred because the cost and ease of installation
that can minimize construction expense
Which of the following statements is not true concerning the operation of a magnetic flow meter? -
Answer It operates partially full
What methods can be used to check the performance of a flow meter? - Answer 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
On what type of treatment process do hydraulic flow variations have the greatest impact? - Answer
Activated sludge
What is important to understand about the impact of high flow on treatment units? - Answer As flow
increases, detention time decreases
What is the first indication that a strong toxic industrial substance has entered the activated sludge
plant? - Answer Increase in oxygen concentration in the aeration basin
Which type of cave in protection provides the best and most practical way to protect workers in deep
excavations? - Answer Drag shields and shoring
How do manholes, lift stations, and other features associated with collections/treatment systems would
be viewed from a risk assessment point of view? - Answer Vulnerabilities
Which of the following is an offensive smelling gas found in wastewater treatment plants? - Answer
Mercaptan
Workers in a sludge composting operation should wear respiratory protection because the compost can
give off: - Answer Airborne sludge particles
What safety equipment should an operator use in areas containing gaseous and particulate
contaminants? - Answer Supplied air respirator
Which type of fire extinguisher should be used for an electrical fire? - Answer Class C
An accident prevention program in generate involves which of the following sets of steps? - Answer
Recognition of hazards, evaluation of hazards, and control of hazards
,How often should fire extinguisher be recharged? - Answer After every use
Which of the following can poison the atmosphere in a room and should always be handled with special
care? - Answer Mercury
What is the danger level as defined by federal refs, to individuals whose normal noise exposure might
equal or exceed this dangerous level - Answer 8 hour (TWA) of 85 decibels
Widely fluctuating hydraulic flows may require which of the following? - Answer Flow equalization
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?? - Answer Increase sludge
wasting
As temperature decreases under normal conditions which are the following effect - Answer Biological
activity slows down, viscosity of the H2O increases, solids settle slow
How does a water temperature decrease affect aerobic biological processes? - Answer Decrease in
solids settling efficiency
More oxygen in the solution
Fine screens typically consist of wedge wire, perforated plate, or closely spaced bars with openings in
what range? - Answer 0.06 - 0.25 inches
One advantage of rotating screens over stationary screens is that rotating screens generally - Answer
Do not dam the flow
What is the purpose of injecting diffused air into aerated grit chambers? - Answer To lower the specific
gravity of water
What is accomplished by an aerated grit chamber? - Answer Grit is removed
Grit is washed
, Wastewater is freshened
When using cyclones at the end of a grit removal process what will cause a decrease in grit removal
efficiency in the cyclone? - Answer Cyclone inlet pressure too low.
Increase the inlet pressure by adjusting the grit pump discharge
What should an operator do if the communicator is not operating properly? - Answer Check the motor
and look for blockage
Cut off the electricity
Lock out and tag the breaker
Place the bar screen into service
How often should communicators be operated? - Answer Continuously
How can you control the velocity in a grit channel in order to achieve velocities within a range of 0.7 to
1.4 ft/ sec? - Answer Line the sides with bricks or blocks to change the cross-sectional area
Use proportional weirs
Vary the number of channels in service in a multiple channel installation
What is primary clarifiers designed to remove? - Answer Settleable solids
Unless there is equal flow distribution between two clarifiers, increasing the RAS will - Answer Cause
an uneven surface loading rate between two clarifiers
How does an increase of the flow rate to primary clarifiers affect the detention time and surface loading
rate? - Answer Detention time decreases, and loading rate increases
Which of the following expresses the formula for the surface overflow rate per day for a settling tank? -
Answer The volume of flow divided by the surface of the tank
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