WasteWater Operator class C exam practice review

WasteWater Operator class C exam practice review When Chlorine is combined with water what type of pipe should be used? A. Ductile iron B. Asbestos concrete C. PVC D. Carbon Steel Ans- 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 Ans- 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 Ans- B. Indicator 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% Ans- 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 Ans- 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 D. Notify supervisor Ans- C. Read manufacturers manual Detritus is noticed in your grit channel. What is the problem? A. Velocity too fast with short D/T B. Velocity too low with long D/T C. Short circuiting D. Density currents Ans- B. Velocity too low with long D/T What is considered normal operation of an aerobic digester? A. Fill react B. Skim off foam when needed C. Settle and Decant as needed D. Feed only during low flow or constant when the sun is out Ans- C. Settle and Decant as needed A plant with a flow of 1 MGD should be monitored A. Continuously B. Intermittently C. Daily D. Every four hours depending on surface load Ans- A. Continuously What do total solids consist of? A. Dissolved and settleable B. Floatable and settlable C. Suspended and dissolved D. Settlable and nonsettleable Ans- 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 Ans- A. Misalignment Amperometric titration is used to measure A. Dissolved solids B. Chlorine residual C. Colloids D. Emulsions Ans- B. Chlorine residual What growth phase is an aerobic digester operated in. A. Log B. Lag C. Endogenous respiration D. Declining phase Ans- 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 Ans- 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 D. Discharge rate too low Ans- B. Over lubrication Where can you gain access for collection system maintenance? A. Lift station B. Force main C. Man hole D. Gravity main Ans- C. Man hole Low DO and nutrient deficiency will promote the growth of what? A. Rotifers B. Filamentous bacteria C. Spirillium D. Amoebas Ans- B. Filamentous bacteria When charging a lead-acid type battery for a composite sampler, what dangerous gas could be produced? A. Hydrogen B. Oxygen C. Hydrogen sulfide D. Cyanide Ans- A. Hydrogen 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 Ans- 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 Ans- 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 Ans- D. Polymer If you pump green sludge to a drying bed what chemical should be applied? A. Polymer B. Lime C. Cl2 D. Alum Ans- 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 Ans- B. Ammonia solution with Q-Tip What takes place in the stabilization tank in a contact stabilization plant? A. Adsorption B. Clarification C. BNR D. Absorption Ans- D. Absorptio