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BASIC WASTEWATER OPERATOR PRACTICE EXAM CLASS 3 QUESTIONS AND ANSWERS
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BASIC WASTEWATER OPERATOR PRACTICE EXAM CLASS 3 QUESTIONS AND ANSWERS
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Name: Score:124 Multiple choice questions
Definition 1 of 124
What part of a chlorine cylinder is designed to melt at 150-160 degrees F to prevent the
cylinder from exploding in the event of a fire?
Thermometer
Clogged impeller
Safety valve
Fusible plug
Definition 2 of 124
Valves should be closed slowly to avoid what?
Check valve
Water hammer
Pressure loss
Water pressure
Definition 3 of 124
What should be done when the bio-reactor in an SBR plant is organically overloaded?
Add more fresh water
Waste more sludge
Increase effluent flow
Nothing - it is normal for bioreactors to be organically overloaded
,Definition 4 of 124
Controlling the sludge wasting rate by constant MLSS concentration involve maintaining a
certain concentration of what?
The volatile suspended solids in the reactor or aeration tanks
The temperature of the reactor or aeration tanks
The chemical oxygen demand of the sludge
The total dissolved solids in the effluent
Definition 5 of 124
Which Activated Sludge process handles shock loads of high organic waste most effectively?
Nitrification
Stator
Conventional
Transitional
Definition 6 of 124
What chemical is used for de-chlorination?
carbon monoxide
sulfur dioxide
hydrogen sulfide
methane
Definition 7 of 124
How should lime slurry lines be cleaned?
Flush with water
Lightly wrap the burn
Cover with a sterile dressing
Flush with cold water for 15 minutes
,Definition 8 of 124
The pressure against which a pump must operate is measured in terms of what?
PSI
PASCALS
MPA
KPA
Definition 9 of 124
A horizontal centrifugal pump has "rope" packing. When the pump is in operation, water slowly
drips from the packing gland. What does this indicate?
The pump is malfunctioning and requires immediate shutdown
The pump is operating at too high a pressure
The packing bolts or nuts on the packing gland are properly adjusted
The packing material needs to be replaced entirely
Definition 10 of 124
Your system serves 2740 people and an industry contributes 300 lbs/day of BOD. How many
pounds per day of BOD are received at your plant?
77 lbs/day
771 lbs/day
766 lbs/day
383 lbs/day
, Definition 11 of 124
What causes the pH to decrease during the anaerobic digestion process?
Production of Volatile Acids
Excessive Wasting
Added Heat
Amounts of Solids in the Sample
Definition 12 of 124
What gas is most commonly associated with septic wastewater?
Sulfur dioxide
Carbon dioxide
Methane
Hydrogen sulfide
Definition 13 of 124
What is the predominant organism in a healthy Activated Sludge Treatment Plant?
Extended aeration
Bacteria
Stalked ciliates
Free-swimming ciliates
Definition 14 of 124
Chlorine is primarily used for what?
Disinfection
Sanitization
Nitrification
Sterilization
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