Wastewater Operator Level 1 Practice Exam Questions Study Guide Practice Questions with Answers 2025/ 2026

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Wastewater
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Exam Questions
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Terms in this set (324)



Progressive Cavity This type of pump, commonly used to pump sludges, consists of a screw-
shaped rotor which rotates within a rubber-lined stator:


light brown and frothy Healthy mixed liquor in an activated sludge process should have what
appearance?


there is a problem with the bearing lubrication and What does a gradual increase in the bearing temperature of a centrifugal
connection blower indicate?


detention time The time is takes for a unit volume of wastewater to pass entirely through
a primary clarifier is called


centrifugal Pumps are often required to bring wastewater into a treatment plant.
What types of pumps are typically used to lift influent wastewater?


typhoid fever, dysentery, cholera Three waterborne diseases are



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2-5 mg/L Conventional activated sludge systems typically operate with a DO range
of:


SDS Which of the following provides safety information for potentially
hazardous or toxic materials?


alert the operator on duty The first step the maintenance staff should take in properly locking and
tagging out a piece of equipment is to:


Denitrification Which of the following would NOT be considered preliminary treatment?


19.5% Oxygen deficiency becomes a concern when the oxygen level in a
confined space is less than


Air Lift This type of pump injects compressed air into a discharge line, which
mixes and raises solids through the line due to sludge density.


Nitrification The appearance of duckweed in a final clarifier is an indication of:



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Packing This material can be made from Teflon or graphite and is used to prevent
leakage between moving parts of a pump:


make no adjustment What is the first course of action if you see a slow constant drip from a
pump shaft packing seal?


mixed liquor volatile suspended solids Which of the following types of solids most accurately represent the
microorganisms in the activated sludge process?


none, it must analyzed immediately What is the maximum recommended holding time for a sample that is to
be analyzed for pH?


Reciprocating This type of positive displacement pump consists of a piston that moves
back and forth


sodium sulfite solution Most DO probes come with an electronic zero for calibration. What
should be used to check the accuracy of this feature on a DO probe?




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