PRACTICE EXAM GRADE III TREATMENT - Division of Water Quality

19. A centrifugal pump is pumping 200 gpm against a 40-ft total pumping head. Theoutput power of the pump is approximately hp.a. 0.5b. 2c. 15d. 12110. When a fire hydrant is operated, it should bea. Opened enough to have a flowb. Opened fullyc. Opened halfwayd. Regulated to flow required11. A 42-in. diameter pipe is flowing at a rate of 6.5 fVsec. What is the flow in cu ttlsec?a. 17.86b. 35.71c. 62.50d. 521.2512. If the pump bearings on horizontal centrifugal pumps are overlubricated, the mostimportant effect is that the extra lubricanta. Will result in smoother and more efficient operation of the pumpb. Will not make any difference in the operation of the pumpc. Will be wastedd. May cause overheating and possible failure of the bearings13. If packing is not maintained properly,a. Cavitation damage will resultb. Impeller will corrodec. Loss of suction will occur due to air being allowed to enter pumpd. Pump efficiency will increase14. Air flow through a trickling filter when the influent is warmer than the air temperatureisa. Upward through the filterb. Downward through the filterc. Inadequate and may require forced air ventilationd. Improved by decreasing the recirculation15. What is affected first when the aerobic digestion process is starting to deteriorate?a. Supernatant qualityb. Temperaturec. Volatile acid:alkalinity ratiod. Volatile solids concentration16. The reaction of chlorine and ammonia in wastewater produces a compound that iscalleda. Ammonium chlorideb. Chloral hydratec. Chloramined. Hydrazine