Download Waste Water Operator class C exam practice review Exam Question & Answers 2025 and more Exams Nursing in PDF only on Docsity!
practice review Exam Question &
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When Chlorine is combined with water what type of pipe should be used? A. Ductile iron B. Asbestos concrete C. PVC D. Carbon Steel - Correct Answers โ
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C. PVC A good settling sludge would consist of what type of protozoa? A. Rotifers and nematodes B. Amoebas and Flagellates C. Stalked ciliates and mastagoria D. Free swimmers and stalk ciliates - Correct Answers โ
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D. Free swimmers and stalk ciliates What is Phenolphylein used for in titration A. Oxidizer B. Indicator C. Acid reducer to lower pH D. Applicator - Correct Answers โ
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B. Indicator
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Your plant has an influent of 220 BOD and 163 TSS, and an effluent of 10 BOD, and 6 TSS. What is the BOD removal efficiency in your plant? A. 92% B. 94% C. 95% D. 96% - Correct Answers โ
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C. 95% You suspect your anaerobic digester is going sour. What is the best way to verify its condition? A. pH B. Foam type C. VA/ALK ratio D. DO - Correct Answers โ
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C. VA/ALK ratio Before operating any piece of equipment what should be done? A. Lock out Tag out (remember, safety first!) B. Read O & M manual C. Read manufacturers manual
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C. Daily D. Every four hours depending on surface load - Correct Answers โ
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A. Continuously What do total solids consist of? A. Dissolved and settleable B. Floatable and settlable C. Suspended and dissolved D. Settlable and nonsettleable - Correct Answers โ
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C. Suspended and dissolved What would cause excessive wear on bearing? A. Misalignment B. Reduced Oil due to low viscosity C. Blow seal D. Over tubercation - Correct Answers โ
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A. Misalignment Amperometric titration is used to measure A. Dissolved solids B. Chlorine residual
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C. Colloids D. Emulsions - Correct Answers โ
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B. Chlorine residual What growth phase is an aerobic digester operated in. A. Log B. Lag C. Endogenous respiration D. Declining phase - Correct Answers โ
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C. Endogenous respiration If excessive pressure builds up in a chlorine tank due to excessive heat. What will prevent explosions? A. Valve seat adjustments B. Heat reducing valve C. Fusible plug D. Check valve - Correct Answers โ
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C. Fusible plug You notice that your bearings are excessively hot on a pump, why? A. Ambient temperature too high B. Over lubrication C. Oil seal blown
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What is the best method in dealing with a chemical spill? A. Contain and clean up B. Saw dust and kitty litter C. Foam congaing super trimethyl bromine D. Flood with water - Correct Answers โ
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A. Contain and clean up There is septic wastewater entering your primary clarifier. What is the problem? A. Aerobic conditions in the collections system B. Lift station pumps operating on short cycles C. Anaerobic conditions in the collections systems D. High flows due to a low MCRT - Correct Answers โ
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C. Anaerobic condition in the collections system Which of the following substances is highly viscous and very slippery? A. Calcium hypochlorite B. Calcium oxide C. Potassium permanganate D. Polymer - Correct Answers โ
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D. Polymer
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If you pump green sludge to a drying bed what chemical should be applied? A. Polymer B. Lime C. Cl D. Alum - Correct Answers โ
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B. Lime Chlorine leaks can be detected by? A. ISCBA B. Ammonia solution with Q-Tip C. Alcohol vapor D. Spray with mist of water - Correct Answers โ
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B. Ammonia solution with Q-Tip What takes place in the stabilization tank in a contact stabilization plant? A. Adsorption B. Clarification C. BNR
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What condition does an operator have the least amount of control over? A. Flow B. Wasting Rate C. F/M ratio D. Temp - Correct Answers โ
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D. Temp Why would you chlorinate the RAS line? A. Remove struvite B. Lower the pH of incoming C. Control Filamentous bacteria D. Meet chlorine demand - Correct Answers โ
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C. Control Filamentous bacteria What is the most common type of pond? A. Anaerobic B. Aerobic C. Facultative D. Polishing - Correct Answers โ
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C. Facultative
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The ash content in lab procedures is the same as? A. Organic solids B. Volatile solids C. Inorganic solids D. Total solids - Correct Answers โ
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C. Inorganic solids Denitrification will cause what? A. Straggler floc B. Rising sludge C. Methane production D. Low MLSS - Correct Answers โ
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B. Rising sludge If a 220 volt, 3 phase motor is running backwards what should you do? A. Switch the two leads B. Return pump for a refund C. Check the polarity magnets D. Check static pressure - Correct Answers โ
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A. Switch the two leads Coliform count fails to meet standards your chlorine supply is not the problem. What is?
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A. Less solids B. Increased power consumption C. Decrease power consumption D. Easier to operate - Correct Answers โ
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C. Decrease power consumption How long should you wait after you make a process change before making another change? A. 7 hours B. 10 days C. When the operator thinks it's necessary D. 1 week - Correct Answers โ
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D. 1 week Determine the MCRT using the following: Known: Aerator volume = 323,000 gal Final clarifier vol. = 150,000 gal Flow = 2 MGD Waste flow = 20,000gal MLSS = 2,400 mg/L
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Waste sludge SS = 6400 mg/L Final eff. SS = 16 mg/L A. 3.3 days B. 4.8 days C. 2.7 days D. 4.1 days - Correct Answers โ
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B. 4.8 days What is needed to calculate the F/M ratio? A. BOD mg/L and MLSS mg/L B. BOD in Ibs and MLVSS in Ibs C. BOD mg/L and MLVSS in Ibs D. BOD in Ibs and MLSS mg/L - Correct Answers โ
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B. BOD in Ibs and MLVSS in Ibs What type of ponds are used after a trickling filter, activated sludge, or RBC plant? A. Facultative pond B. Aeration Pond C. Anaerobic pond
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You have excessive billowing white sudsy foam on the surface of your aerator. What is the cause? A. MLSS too high B. F/M too high C. F/M too low D. MLVSS too high - Correct Answers โ
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B. F/M too high The settleometer settles fairly slowly. You have shiny dark foam on the surface of the aerator. What is the problem? A. MCRT too high B. MCRT too low C. Sludge age too low D. WAS too high - Correct Answers โ
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A. MCRT too high The removal of nitrogen and phosphorus are? A. Useful in the growth of algae B. Advanced secondary treatment C. General practice in extended aeration
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D. Prevents anaerobic conditions - Correct Answers โ
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B. Advanced secondary treatment What would cause a pump to fail to discharge? A. Excessive gravity B. Tubercation C. Suction lift too high D. Proper lubrication - Correct Answers โ
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C. Suction lift too high Chlorine is not coming out. Another cylinder is hooked up with the same problem occurring. What is the problem? A. Educator submerged B. Icing C. Manifold line is blocked D. POA too far - Correct Answers โ
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C. Manifold line is blocked How would you measure the amount of load being applied from the digester to the head works? A. Total solids test B. BOD
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D. On system tile under drains - Correct Answers โ
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D. On system tile under drains If you have a sudden increase of BOD by 50% or a BOD>400. What is this termed? A. Under loaded aerator B. Overloaded clarifier C. Increased inorganic load D. Increased organic load - Correct Answers โ
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D. Increased organic load Coliform bacteria are used for what? A. Process control changes B. Indicators of possible presence pathogenic organisms C. Prevent disease D. Remove Co2 residual in sample bottle - Correct Answers โ
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B. Indicators of possible presence pathogenic organisms Where does the effluent from the aerator go? A. Secondary clarifier
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B. Primary clarifier C. Solids handling D. Digester - Correct Answers โ
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A. Secondary clarifier A decrease in temperature will have what effect on disinfection? A. Require longer contact time B. Require shorter contact time C. Increase rate of disinfection D. Have no effect on disinfection - Correct Answers โ
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A. Require longer contact time Cl2 combined with ammonia forms what? A. Hydrochloric acid B. Chloroammonia acid C. Chloramines D. Hypochlorous acid - Correct Answers โ
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C. Chloramines At what pH would disinfection be at its greatest? A. 9 B. 7
