WasteWater Operator class C exam practice review | 100 Questions and Answers(A+ Solution guide)

When Chlorine is combined with water what type of pipe should be used? A. Ductile iron B. Asbestos concrete C. PVC D. Carbon Steel - 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 - 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 - 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% - 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 - C. VA/ALK ratio