Wastewater Practice exam questions and answers 100% pass

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Wastewater Practice exam questions and answers 100% pass When organic wastes are discharged to receiving waters, O2 is depleted by _____. ✔✔bacteria Hydrogen sulfide gives off an odor similar t... o____. ✔✔rotten eggs 3 diseases potentially carried by wastewater are _____. ✔✔typhoid fever, disentery, cholera Immediate first aid for butrns is to ____. ✔✔flood with cold water What most likely causes an electic motor failure? ✔✔mopisture What mixed liquor characteristics indicate a healthy activated sludge process? ✔✔brown color, frothy appearance, and musty odor T/F: Algae is a plant life necessary for the proper functioning of a stabilization or oxidation pond. ✔✔True Chlorine gas is ? ✔✔heavier than air T/F: The highest concentration of algae growth in a facultative lagoon is usually observed near the top. ✔✔True Common hydraulic detention times for primary clarifiers range from ____ hours ✔✔2 - 3 hours T/F: Methane is produced in an anaeroibic digester and can be used as a fuel? ✔✔True T/F: The rock in a trickling filter is usually placed on a tile underdrain system. ✔✔True What is the purpose of heating and mixing a primary anaeroibic digester? ✔✔to increase the digestion rate T/F: Exhaust from a chlorinator room should be taken form floor level. ✔✔True T/F: Chlorine residual may be determined using the reagent _____ ✔✔diethyl-p-phenylene diamine (DPD) What test is typically never performed on wastewater influent? ✔✔fecal coliform Considering the layout and flow diagram for the complete treament plant, oxidation ditch plants would be most similar to _____? ✔✔extended aeration The pressure against which a pump must operate is measured in terms of _____ ✔✔kPA (psi) T/F: Assuming aa constant suction head, the discharge of a centrifugal pump decreases with an increase in discharge head. ✔✔True T/F: The addition of chlorine, acid, carbon dioxide, or sulfuric acid will "lower" the pH of wastewater? ✔✔True T/F: Activated sludge generally "settle more slowly" than raw sludge. ✔✔True T/F: Controlling the sludge wasting rate by constant MLSS concentration involves maintaining a certain concentration of "volatile suspended solids in the reactor(aeration tanks) ✔✔True T/F: "Fungi" organisms should mot be present in a healthy lagoon treament system ✔✔True T/F: Under ice and snow cover, the BOD level in poinds will mormally "increase slowly". ✔✔True T/F: The rotational speed of the air-driven rotating biological contactor (RBC) is controlled by "air volume". ✔✔True T/F: chloramines are "combined chlorine." ✔✔True T/F: An "increase in organic matter" increases chlorine demand. ✔✔True When a high organic waste load reaches an activated sludge plant, the operator's first indicator is a decrease in ✔✔DO residual in the reactors (aeration tanks) Disaster planning is ____ ✔✔useful in reducing confusion in the event of a disaster. The gas most commonly associated with septic wastewater is ✔✔hydogen sulfide In electrical circuits, a ______ is used to reduce the voltage where necessary. ✔✔transformer What causes the greatest pipe friction loss? ✔✔Increasing the velocity of wastewater T/F: Denitrification is the most likely cause of rising sludge in clarifiers. ✔✔True The amount of BOD in sludge entering a digester is an indirect measure of the ✔✔"food" available for bacteria in the digester. Chemical coagulation doses can be initially estimated by ✔✔jar tests. An incubator for the BOD test should be controlled at ____C. ✔✔30 degrees In certain situations, a supervisor encourages the employees to make their own decisions. This is considered to be ______ ✔✔highly desirable because it encourages employee growth and frees the supervisor for other tasks What peeice of lab equipment should be calibrated daily at a treament plant? ✔✔portable dissoved oxygen probe The ask content remaining at the end of a VSS test is the same as the ____. ✔✔inorganic solids A chlorine demand test will show the ______. ✔✔amount of chlorine required to give a desired residual after a given time. Jar tests may be used to determine the optimum dosage of ______. ✔✔polymer Which activated sludge process ccould handle shock loads of dairy waste most effectively? ✔✔a tapered aeration system When chlorine reacts with hydrogen sulfide gas, the hydrogen sulfide is ______. ✔✔oxidized and made odorless T/F: in the membrane filter method, the number of coliforms is estimated by the _____. ✔✔number of coloniew grown Decentralized authority describes the process of _______. ✔✔delegating power for decisions to lower levels [Show More]

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