PRACTICE EXAM GRADE III TREATMENT - Division of Water Quality

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31. Given the data below, what is the most likely cause of a low DO level in an activated sludge aeration tank with a diffused aeration system problem?Data: Blower air rate output highOrganic load normalHydraulic load normalLow turbulence throughout aeration tanka. Aeration system piping leakingb. Excessive air bubble shearing by diffusersc. Return sludge rate 100 highd. Underaeration because of low blower speedl32. Given the data below, what is the most likely cause of the extended aeration facilityproblem?Data: Blower normalRow normal for dry weatherDO level normalDrop pipe air control valves half openDead spot on surface around one drop pipeDead spot remains when drop pipe air control valve fully opena. Air header pipe cloggedb. Blower discharge pipe cloggedc. Blower intake filter cloggedd. Drop pipe clogged.33. An incubator for the BOD test should be controlled at 0c.a. 15b. 20c. 25d. 3034. Results of the settleable solids test run using Imhoff cones may be used toa. Calculate the Imhoff settling index (lSI)b. Calculate the pounds of primary solids pumped to the digesterc. Indicate the quality of the final effluentd. Calculate the sludge volume index (SVI)35. Calculate the percent volatile solids.Data: 100 mL of sampleCrucible weight = 19.985 0 gCrucible plus dry solids = 20.050 3 gCrucible plus ash = 20.0068 ga. 33%b. 50%c. 67%d. 74%
36. In certain situations, a supervisor encourages the employees to make their owndecisions. This is considered to bea. Against the rules to follow past experiences in decision makingb. Bad form because the supervisor eventually loses controlc. Highly desirable because it encourages employee growth and frees the supervisorfor other tasksd. Passing the buck37. Treatment basin (such as primary sedimentation, grit tank, aeration tank, and finalclarifier) drainsa. Must be higher than the receiving sump to allow for gravity flow out of thebasinb. Must be lower than the receiving sump to allow for gravity flow out of thebasin and into the sumpc. Need not be valved closed if the drain is higher than the receiving sumpd. Need not be maintained because it is always faster to pump a treaunent basindry than allow it to drain to the receiving sump38. Successful communication requires mutuala. Agreementb. Confusionc. Transmissiond. Understanding39. When a great deal of authority is delegated on many levels, an organization may bedescribed asa. Authoritarianb. Centralizedc. Decentralizedd. Unstructured40. What should a new crew leader on a shift do if he/she discovers a better way ofdoing a certain operation?a. Discuss the plan with other shift supervisorsb. Explain the plan and its benefits to the chief operator or plant supervisorc. Implement the pland. Write a letter to the plant supervisor outlining the intended improvements41. Generally, as an individual progresses upward in management, reliance on personaltechnical skilla. Becomes more complexb. Decreasesc. Increasesd. Remains the same42. If the sewer rate is $5.50 for the first 500 cu ft and all wastewater generated overthe minimum is billed at the rate of $0.25 per 100 cu ft, how much would a customergenerating 1 200 cu ft be billed?a. $5.25b. $6.25c. $6.75d. $7.25
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PRACTICE EXAM GRADE III TREATMENT - Division of Water Quality

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