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BASIC WASTEWATER OPERATOR PRACTICE EXAM CLASS 3 QUESTIONS WITH COMPLETE ANSWERS

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BASIC WASTEWATER OPERATOR PRACTICE EXAM CLASS 3 QUESTIONS WITH COMPLETE ANSWERS

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What type of flow meters are used during normal operations of the sludge removal?


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magnetic




What would most likely cause a submersible pump to have an AMP reading that is
above the optimum level?


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Clogged impeller

,Assuming a constant suction head, the discharge of a centrifugal pump
_______________________


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will decrease with an increase in discharge head




Calculate F:M ratio
GIVEN: Influent BOD5 = 290mg/l
Influent Flow = 5.0MGD
Aeration basin MLSS = 2650 mg/l
Aeration basin volume = 0.8MG


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0.68




What is the main concern when a chemical spill occurs?


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Containment and Cleanup




How is an air-gap device used?


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, To prevent contamination of potable water systems




What type of equipment should be calibrated daily at the plant?


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Portable DO probe/ meter




Why is mechanical ventilation of a lift station required?


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To minimize the presence of harmful gases




An equipment failure warning light did not turn on, but a failure was reported and
repaired. What is the first thing the operator needs to do?


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Check/ replace the bulb in the indicator light




The amount of BOD in sludge entering a digester would be an indirect measure of
what in the digester?


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, Food




When collecting a sludge sample, where is the most representative sample location?


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In the middle, after all return flows have been well mixed




How can chemical coagulation (POLYMER) dose be initially estimated?


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Jar test




What is suction lift?


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The pressure on the suction side of the pump




How do you calibrate a chemical feed pump?


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