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CWEA ENVIRONMENTAL
COMPLIANCE EXAM QUES TIONS
AND ANSWERS
Question : According To Osha, Which Of The Following
Oxygen In Air Concentration Is The Lowest Safe Concentration For Humans To Breathe In Order To Avoid The Hazard Of Oxygen Deficiency?(a) 19.5% Oxygen
Correct Answer: 19.5% Oxygen
Question : Which Of The Following Types Of
Wastewater Would Settling Occur Most Rapidly?(a) Cold Wastewater (b) Old Wastewater (c) Septic Wastewater (d) Strong Wastewater
Correct Answer: Strong Wastewater
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Question : What Does Pump Maintenance Include?
(a) Checking Operating Temperatures Of Bearings (b) Checking Packings Glands (c) Lubricating The Impeller (d) All Of The Above
Correct Answer: All Of The Above
Question : The Fusible Plug That Is In All Chlorine
Containers?(a) May Be Used As A Tap For The Chlorine Source (b) Should Be Removed After The Cylinders Are Empty (c) Should Never Be Removed Or Tampered With (d) Should Be Removed Prior To Withdrawing Chlorine From The Container
Correct Answer: Should Never Be Removed Or
Tampered With
Question : What Type Of Pump Is Not Seriously
Damaged If The Discharge Valve Is Closed For A Short Time, While The Pump Is Running?
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Correct Answer: Centrifugal Pump
Question : Which Of The Following Chemicals Would Be
The Most Effective In Achieving A Ph Adjustment Of 8.4 So Nitrification Can Take Place In An Rbc?
Correct Answer: Soda Ash
Question : Acids Should Never Be Added To Chlorine
Solution Because They...
Correct Answer: Cause Chlorine Gas To Be Released
Question : Which Of The Following Is A Method For
Treating Flow To The Primary Settling Tank That Would Increase Grease Removal, Efficiency Of That Unit?
Correct Answer: Preaerate
Question : When Organic Waste Our Discharged To
Receiving Water, Oxygen Is Depleted By...
Correct Answer: Bacteria
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Question : From A Public Health Standpoint, Which Of
The Following Is The Safest Sludge For Soil Conditioning Purposes
Correct Answer: Heat Dried Sludge
Question : As A Digester Approaches "Sour" Conditions: (a) Alkalinity Of Solids Decreases.(b) Concentration Of Volatile Acids Increases.(c) Amount Of Methane Production Decreases.(d) All Of The Above.
Correct Answer: All Of The Above
Question : What Purpose Do The Chemicals That Are
Added To The Distilled Water For The Bod Test Serve?
Correct Answer: They Adjust The Ph Within The
Desirable Range And Provide Essential Elements For The Growth Of The Biological Life Actually Exerting The Oxygen Demand