Water Operator Certication Study Guide Grade 1 Exam Questions With 100% Correct Answers.

The two most important factors impacting the effectiveness of chlorination are - c. concentration of chlorine and contact time The treatment process that controls corrosion or scaling is known as_______ - b. stabilization Permanganate reactions are highly dependent upon - b. pH It is hardest to kill the organism that causes which one of the following illnesses? a. Cholera b. Typhoid c. Cryptosporidiosis d. Infectious hepatitis - c. Cryptosporidiosis Disinfection of water wells with free chlorine requires exposure for ____at a concentration of _____ - c. 12 to 24hrs; 50 mg/L Detention time in flocculation basins are usually designed to provide for_____ - b. 15 - 45 minutes Alum works best in a pH of ____ - c. 5.8-8.5Name a true statement concerning colloidal particles? - a. colloidal particles are so small that gravity has little effect on them Which natural electrical force keeps colloidal apart in water treatment? - c. zeta potential The zeta potential measures the number of excess___found on the surface of all particulate matter. - a. electrons Which device collects the settled water as it leave the sedimentation basis? - d. effluent launder In solid-contact basins with fairly constant water quality parameters, how often should the solids concentration be determined? - d. at least twice a day