Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Wastewater Treatment
Exam Prep For Wastewater Exam #2
| Question | Answer |
|---|---|
| 1) When organic wastes are discharged to receiving waters, oxygen is depleted by a) Algae during the day b) Bacteria c) Ducks d) Limestone rocks | b) Bacteria |
| 2) Employee hazards include a) Noxious or toxic gases or vapors b) Oxygen deficiency c) Physical injuries d) All of the above | d) All of the above |
| 3) Hydrogen sulfide gives off an odor similar to a) Ammonia b) Chlorine gas c) Rotten eggs d) Decayed wood | c) Rotten eggs |
| 4) Coliforms Bacteria are a) Algae b) Coagulant aids c) Indicators d) Sequestering agents | c) Indicators |
| 5) Three Waterborne diseases are a) Mumps, Measles, colds b) Scarlet fever, pneumonia, hay fever c) Typhoid fever, dysentery, cholera d) TB, diphtheria, chickenpox | c) Typhoid fever, dysentery, cholera |
| 6) A cylindrical tank is 10 feet in diameter and 20 feet in height. What is the approximate capacity in liters? Formula a) 44,450 b) 31,030 c) 5,942 d) 4,445 | a) 44,450 |
| 7) First Aid for first degree burns a) Bandage tightly b) Cover liberally with a salve c) Immerse in warm water d) Immerse in cold water | d) Immerse in cold water |
| 8) Which of these pH readings indicates an acidic wastewater? a) 3 b) 7 c) 9 d) 20 | a) 3 |
| 9) If water weighs 8.34 pounds per gallon, how much will seven and one-half gallons weigh? Formula a) 50 pounds b) 62.5 pounds c) 75.6 pounds d) 77 pounds | b) 62.5 pounds |
| 10)One milliliter is what fraction of a liter? a) 1/10 b) 1/100 c) 1/1000 d) 1/1000,000 | c) 1/1000 |
| 11)The normal cause of electric motor failure is a) Dirt b) Moisture c) Friction d) All of the above | d) All of the above |
| 12)A pump can deliver 400 gallons per minute at a total head of 184.8 feet. What is the pressure equivalent to this head, expressed in lbs per square inch? Formula a) 42.7 psi b) 80 psi c) 427 psi d) None of the above | b) 80 psi |
| 13)Approximately how many gallons of wastewater would a 600 feet of 6 inch pipe hold? Formula a) 740 b) 880 c) 900 d) 930 | b) 880 |
| 14)A water seal on a pump serves a dual purpose. It acts as a lubricant and it also a) Acts as a coolant to keep the pump bearings from overheating b) Keeps gritty material from entering the packing box c) Keeps the pump primed d) Is a reserve water supply? | b) Keeps gritty material from entering the packing box |
| 15)The elevation of any pump above the source of the supply should not exceed ______feet. a) 2.2 b) 22 c) 200 d) 224 | b) 22 |
| 16)The three common types of plastic pipe are listed as: PVC, PE and ABS. These Names refer to the a) Chemical resistance of the pipe b) Composition of the pipe c) Pressure for which the pipe is designed d) Types of appropriate application | b) Composition of the pipe |
| 17)Prior to repairing a pump’s electrical circuit, which of the following actions should you take? a) Disconnect the circuit breaker, and place a red tag stating, “do not activate”, and lock out. b) Notify your supervisor. c) Tell all of the operators not to activate the circuit. d) Turn the pump off. | a) Disconnect the circuit breaker, and place a red tag stating “do not activate”, and lock out. |
| 18)Pump maintenance includes a) Checking operating temperature of bearings b) Checking packing gland c) Operating two or more pumps of the same size alternately to equalize wear d) All of the above | d) All of the above |
| 19)When carrying out a routine inspection on a centrifugal pump. It is noted by the operator that the bearings are excessively hot. This could be caused by a) Over lubrication b) Speed too slow c) Worn impeller d) Worn packing e) Both c & d | a) Over lubrication |
| 20)In a centrifugal pump, internal leakage is prevented by a) Impellers b) Sleeves c) Volutes d) Wear rings | d) Wear rings |
| 21)A valve that allows water to flow in one direction only is a _______ valve a) Check b) Gate c) Globe d) Petcock | a) Check |
| 22)Pipe material that is the least susceptible to corrosion by acids formed from hydrogen sulfide gas is a) ACP b) CIP c) RCP d) VCP | d) VCP |
| 23)Centrifugal pump parts include a) Diaphragm b) Impeller c) Piston d) Rotor e) Both b & d | b) Impeller |
| 24)Which indicates good quality domestic activated sludge a) Black color and septic odor b) Brown color and musty odor c) Brown color with lots of dark brown foam d) Settle ability of 900 malls in a liter cylinder over a 30 minute period | b) Brown color and musty odor |
| 25)Which of the following forms of plant life is necessary for the proper functioning of a stabilization or oxidation pond? a) Algae b) Cattails c) Water lilies d) Weeds e) Both a & c | a) Algae |
| 26)Cattails growing in a lagoon will a) Cause short circuiting in affected lagoon b) Eliminate mosquito larvae c) Stabilize the sediment in the pond d) Increase diurnal pH fluctuations e) Increase toxic blue-green algae concentrations in the effluent | a) Cause short circuiting in affected lagoon |
| 27)At what time of day is the dissolved oxygen content highest in a waste stabilization lagoon? a) 3 am b) 7 am c) 9 am d) 12 (noon) e) 3 pm | e) 3 pm |
| 28)The greatest bacterial activity and the highest BOD5 removal in a waste stabilization lagoon will occur when there is a) Good sunlight, cold temperatures and strong wind b) Warm temperature, strong wind and heavily overcast c) Moderate breeze, cold temperature and good sunlight d) Warm temperature, moderate breeze and good sunlight | d) Warm temperature, moderate breeze and good sunlight |
| 29)Chlorine gas is a) Colorless b) Heavier than air c) Non-toxic d) Odorless e) Both a & c | b) Heavier than air |
| 30)Acids should never be added to chlorine solutions as they a) Cause chlorine gas to be released b) Corrode or “eat away” the solution tank c) Decrease the disinfecting properties of chlorine d) Result in the formation of a chloride precipitate e) All of the above | a) Cause chlorine gas to be released |
| 31)As water temperatures decrease, the disinfecting action of chlorine a) Decreases b) Increases c) Remains the same | a) Decreases |
| 32)The highest concentration of algae growth in a lagoon is usually observed a) Near mid-depth b) Near bottom c) Near top d) Below 10.0 feet | c) Near top |
| 33)Which of the following is not a possible cause of short-circuiting in a pond? a) Excessive weed growth b) High influent BOD c) Poor arrangement of inlet and outlet d) Irregular pond bottom | b) High influent BOD |
| 34)Common settling times in wastewater treatment plants range from a) 15 to 30 minutes b) 30 to 45 minutes c) 1 to 2 hours d) 2 to 4 hours | d) 2 to 4 hours |
| 35)Which gas is produced in anaerobic digesters and can be used as a fuel? a) Propane b) Methane c) Ethane d) Carbon dioxide e) Both a & b | b) Methane |
| 36)Compute the lagoon’s approximate detention time in days. Information: Surface area = 6.0 acres Average depth = 3.0 feet average evaporation exceeds precipitation by 0.4 in/day Average daily flow(influent) = 0.25 MGD acre (area) = 43,560 sq. ft. 1 cu. Ft. contains 7.5 gal a) 24 b) 32 c) 37 d) None of the above | a) 24 b) 32 c) 37 d) None of the above |
| 37)How many pounds of chlorine gas is necessary to treat 4,000,000 gallons of wastewater at a dose of 2 mg/l? Formula a) 61 lbs. b) 65 lbs. c) 67 lbs. d) 69 lbs. | c) 67 lbs. |
| 38)Assume a community of 1,100 people has a lagoon. The flow averages 80,000 gallons per day. The flow is Formula a) 14 gallons per capita. b) 73 gallons per capita. c) 80 gallons per capita. d) 140 gallons per capita. | b) 73 gallons per capita. |
| 39)The rock in most trickling filters is placed a) Directly on the ground b) Directly in a concrete slab c) On a system of tile underdrains d) On a rubber tile floor | a)Directly on the ground b)Directly in a concrete slab c)On a system of tile underdrains d)On a rubber tile floor |
| 40)Chlorine is used to a) Disinfect b) Prevent corrosion c) Raise the pH d) Stabilize organics | a) Disinfect |
| 41)What is the purpose of heating and mixing a primary anaerobic digester? a) To eliminate oxygen present b) To increase the digestion rate c) To keep methane gas in suspension d) To prevent settling of grit to the bottom of the digester e) a, b & c | b) To increase the digestion rate |
| 42)The following device is used to measure the flow of wastewater: a) Comminute b) Comparator c) Parshall flume d) Sluice gate | c) Parshall flume |
| 43)A spray nozzle on the mechanically cleaned screen has become plugged. To ensure your safety, prior to entering the screen housing to repair the nozzle, you should a)Leave a note on the breaker panel stating a repair is being made b)Request assistance for the repair c)Turn off and lock the motor control d)Turn off local control switch. | c) Turn off and lock the motor control |
| 44)Exhaust from a chlorinator room should be taken from a)Anywhere the volume is important not the location b)At floor level c)Close to the entrance d)In the ceiling | b) At floor level |
| 45)Which of the following would be the safest action to take in the event of a major chlorine leak? a)Call the fire department to hose down the chlorine container b)Notify local police or sheriff c)Roll the container so that liquid rather that gas escapes d)Submerge the container in a basin or stream if feasible | b) Notify local police or sheriff |
| 46)As water temperatures decrease, the disinfecting action of chlorine a) Decreases b) Increases c) Remains the same | a) Decreases |
| 47) A composite sample will give a (n) a)even color b)high pH. c)Instantaneous sample. d)Representative sample | d) Representative sample |
| 48)Chlorine residual may be determined using the reagent a)Diethyl-p-phenylenediamine (DPD) b)Ethylendiamine tetraacetic acid (EDTA) c)Poly chlorinated biphenyls (PCB) d)Sodium thiosulfate (Na2 S2 O3) | a) Diethyl-p-phenylenediamine (DPD) |
| 49)Results from the Multiple-Tube Fermentation Technique for members of the total Coliform Group are expressed as a)DPD b)MF c)MGD d)MPN | d) MPN |
| 50)Drawings which are considered "As Built" would be a)Construction drawings issued to the contractor. b)Corrected construction drawings corrected to show changes made in the field installation. c)Detailed drawings of the proposed construction. d)Sectional maps on file. | b) Corrected construction drawings corrected to show changes made in the field installation |
| 51)Sources for more information and training courses are a)Federal, state and local water pollution control agencies. b)Libraries. c)Local and national water pollution control associations. d)All of the above. | d) All of the above. |
| 52) What test is not run on the influent a)BOD b)Fecal coliform c)Suspended solids d)pH | b) Fecal coliform |
| 53) What disease is not considered to be normally conveyed or transmitted by untreated wastewater? a)Amoebic dysentery b)Hepatitis c)Malaria d)Cholera | c) Malaria |
| 54) Pathogens a)Are bacteria or virus that cause disease. b)Are bacteria that do not occur in water. c)Can obtain their food supply without help. d)Are not harmful to man. | a) Are bacteria or virus that cause disease. |
| 54) Improper handling, storage or preparing solutions of chemicals can cause a)Burns b)Explosions c)Loss of eyesight d)All of the above | d) All of the above |
| 55) Considering the layout and flow diagram for the complete treatment plant, most oxidation ditch plants would be most similar to which of the following? a)Completely mixed activated sludge b)Contact stabilization c)Conventional activated sludge d)Plug flow aeration | a)Completely mixed activated sludge b)Contact stabilization c)Conventional activated sludge d)Plug flow aeration |
| 56) Over a four-year period, the hour meter on an instrument air compressor had the following readings at the end of each year: 1st year 976.3; 2nd year 1325.8 3rd year 2007.1 4th year 2371.4 How many hours does the meter show the compressor ran for the third year? a)349.5 hours b)364.3 hours c)681.3 hours d)830.2 hours | c) 681.3 hours |
| 57) If a truck starting with a full tank of gasoline is driven 115 miles and you fill the truck with gasoline the following day and it requires 9.7 gallons to fill. How many miles per gallon did the truck average? a)9.2 miles per gallon. b)11.8 miles per gallon. c)17.6 miles per gallon. d)20 miles per gallon | b) 11.8 miles per gallon 115 miles /9.7 gallons = 11.8 miles/gallon |
| 58) An air-gap device is used to a)Increase oxygen content in manholes b)Prevent cross connections c)Prevent excessive vibration in pipe joints d)Aerate water | b) Prevent cross connections |
| 59) A horizontal centrifugal pump has a rope packing. When the pump is operating, water slowly drips from the packing gland.This indicates that the a)Packing bolts or nuts on the packing gland should be tightened b)Packing bolts or nuts on the packing gland should be loosened c)Packing bolts or nuts on the packing gland should be are properly adjusted d)Packing should be replaced | c) Packing bolts or nuts on the packing gland should be are properly adjusted |
| 60) Dresser and victaulic couplings are commonly used with what pipe materials? a)Asbestos cement b)Cast iron c)Concrete d)Plastic | b) Cast iron |
| 61) If a fuse continues to blow, an operator should a)Replace it with a higher capacity fuse b)Provide a “jum[er” in the box c)Inspect the affected equipment to determine the cause d)Contact the power company to check for power surges | a) Replace it with a higher capacity fuse b) Provide a “jum[er” in the box c) Inspect the affected equipment to determine the cause d) Contact the power company to check for power surges |
| 62) A single piston reciprocating pump has a 6-inch diameter piston with a 6 inch length of stroke. If it makes 16 discharge strokes per minute, the pumping rate is __________ gallons per minute. a) 6 b) 12 c) 25 d) 47 | b) 12 |
| 63) A fire hydrant should be closed slowly to avoid a)Excessive head loss b)Excessive Wear c)Injury to the operator d)Water hammer | d) Water hammer |
| 64) In electrical circuits a(n) _________is used to reduce the voltage where necessary. a) Ammeter b) Thermal overload c) Transformer d) Voltmeter | c) Transformer |
| 65) Wear rings are installed in a pump to a)Hold the shaft in position b)Keep the impeller in place c)Concentrate wear on an economically replaceable part d)Wear out rings instead of the sleeves | c) Concentrate wear on an economically replaceable part |
| 66) Globe valves are used for all of the following purposes, except a)Air-vacuum control b)Flow regulation c)Pressure regulation d)Pump control | a)Air-vacuum control b)Flow regulation c)Pressure regulation d)Pump control |
| 67) A positive displacement sludge pump should never be placed into operation a)Without being primed b)With the discharge valve closed c)With the discharge valve open d)None of the above | b) With the discharge valve closed |
| 68) Closing a valve too quickly causes a)A surge in the line b)No problems in the piping c)Pipe fittings seat and become more secure d)The wastewater goes septic | a) A surge in the line |
| 69) What effect will the addition of chlorine, acid, alum, carbon dioxide, or sulfuric acid have on the pH of wastewater? a)Neutralize b)Lower c)Increase d)Have no effect | b) Lower |
| 70) Given the data below, what is the most likely cause of the extended aeration facility problem? Data: DO in aeration high Sludge blanket in clarifier is high Return sludge flow is low Air control valve is open Blower normal a)Adjustable slot plate elevation too low b)Returned sludge air lift is clogged c)Scum ejector clogged d)Sludge collector shear pin broke | b) Returned sludge air lift is clogged |
| 71) In which of the following types of wastewater would setline occur most rapidly? a)Cold wastewater b)Turbulent wastewater c)Septic wastewater d)Strong wastewater | a) Cold wastewater |
| 72) Settled activated sludge is generally ______ than raw sludge. a)Thinner b)Thicker c)Saltier d)Denser e)Both b & d | a) Thinner |
| 73) Which of the following operational controls are used in the activated sludge process? a)Aeration, wasting, recirculation. b)Loading rate, solids concentration, DO. c)Recycling rate, blower speed, sludge age. d)Sludge blanket depth, settleability, floc size. | b) Loading rate, solids concentration, DO. |
| 74) Which of the follow is not biologically active in a lagoon? a)Aerobic bacteria b)Anaerobic bacteria c)Algae d)Fungi | d) Fungi |
| 75) Under ice and snow cover, the BOD level in the ponds will normally. a)Decrease rapidly b)Decrease slowly c)Increase slowly d)Remain the same | c) Increase slowly |
| 76) An amperometric titrater is used to measure a)Alkalinity b)Chlorine residual c)Conductivity d)COD | b) Chlorine residual |
| 77) Chloramines are a)Combine chlorine b)Enzymes c)Found in polluted air d)Diffuser head settings | a) Combine chlorine |
| 78) The rotational speed of the air driven rotating biological contactor (RBC) is controlled by a)Air pressure b)Air velocity c)Air volume d)Diffuser head setting | a) Air pressure |
| 79) Which of the following conditions increases chlorine demand? a)Alkalinity increases b)Increase in organic matter c)Increase in phosphate concentration d)pH increase | b) Increase in organic matter |
| 80) The purpose of adding sodium thiosulfate to a microbiological sample bottle is to a)Extend the allowable holding time from 6 to 30 hours b)React with nitrates that interfere with the MPN test c)Remove any chlorine residual present d)To ensure sterilization of the sample bottle | c) Remove any chlorine residual present |
| 81) Which of the following conditions are normal conditions for a manual control gas chlorination process? a)Lines free of ice b)Pressure reading slowly decreasing c)Rotometer float fluctuation over a range of ten pounds per 24 hours d)Vacuum gauge fluctuation over a range of 10” Hg | a)Lines free of ice b)Pressure reading slowly decreasing c)Rotometer float fluctuation over a range of ten pounds per 24 hours d)Vacuum gauge fluctuation over a range of 10” Hg |
| 82) Calculate the weir loading for a sedimentation tank that has an outlet weir 480 ft. long and a flow of 5 MGD. a)96 gpd/ft. b)9600 gpd/ft. c)9920 gpd/ft. d)10,420 gpd/ft. | d) 10,420 gpd/ft. |
| 83) A settling basin has a length of 60 ft., width of 20 ft., and a depth of 12 ft. At a flow rate of 6 mgd, What is the retention time of this basin? a)15 minutes b)26 minutes c)1.1 hours d)2.3 hours | c) 1.1 hours |
| 84) Calculate the pounds of BOD per day entering the trickling filter. Data: Raw wastewater flow is 1.5 MGD Raw wastewater BODis 150 mg/l There is a 30% reduction in BOD across the primary clarifiers. a)560 lbs/day b)870 lbs/day c)880 lbs/day d)1600 lbs/day | d)1310 lbs/day |
| 86) How many pounds of chlorine will be used in one day if the flow is 700,000 gpd and a uniform dose of 1.2 mg/l is maintained. a)7 lbs b)15 lbs c)22 lbs d)26 lbs | a)7 lbs |
| 87) The main action of mixed media filter is a)Straining b)Disinfection c)Coagulation d)None of the above | a) Straining |
| 88) Chlorine cylinders may be lifted using a)Cables b)Chains c)Clamps d)Ropes | c) Clamps |
| 89) A chlorine leak can be detected by a)An exolosimeter b)Checking the leak gauge c)Green or reddish deposits on metal d)Spraying water on suspected leaks | c) Green or reddish deposits on metal |
| 90) Failure of the chlorine solution pump would result in a)A decrease in digester gas production b)An increase in digester gas production c)Lower effluent fecal coliform count d)None of the above | d) None of the above |
| 91) Appreciable quantities of septic sludge "burping" to the surface of a primary settling tanks may indicate a)Excessive activity of worms in the sludge settling tank b)Excessive sludge scraper speed c)Grit chambers are not properly removing grit d)Sludge is not being pumped in sufficient quantities | d) Sludge is not being pumped in sufficient quantities |
| 92) Not supplying enough air will cause a)Effluent quality to improve b)Excessive turbulence to occur on aeration compartment surface c)Slick spots to show up on aeration compartment walkways d)Turbidity of final effluent to increase | d) Turbidity of final effluent to increase |
| 93) Given the data below what is the most likely cause of the extended aeration facility problem? Data: DO level high Blower normal Wastewater characteristics normal. Drop pipe air control valve open Surface turbulence high a)Air relief valve stuck shut. b)Blower speed too fast c)Blower speed too slow d)Drop pipe air control valves not open far enough | b) Blower speed too fast |
| 94) If the sludge depth in a secondary sedimentation tank is too high, what will happen? a)Decrease in turbidity in the effluent. b)Returned activated sludge will have a lower oxygen demand. c)Settleable solids from the aeration tank will increase. d)Sludge may become septic. | d) Sludge may become septic |
| 95) What might cause a white filamentous growth in a RBC system which will result in poor BOD removal efficiency? a)High pH in the wastewater. b)Low BOD loading. c)Low pH in the Wastewater. d)Septic wastewater. | d) Septic wastewater. |
| 96) Pump station maintenance reports should include. a)Additional maintenance scheduling required. b)How repairs were made. c)Special equipment required. d)All of the above. | d) All of the above. |
| 97) Disaster planning is a)Having manuals ready so they can be read if a disaster occurs. b)Something that, if properly done, will not need to be revised. c)Useful in reducing confusion in the event of a disaster. d)None of the above | c) Useful in reducing confusion in the event of a disaster. |
| 98) Every day the operator of a small wastewater treatment plant should a)Clean settling basins and dispose of sludge. b)Determine that all the plant equipment is operational. c)Replenish chemical stock. d)Test start standby pimps, motors and generators. | b) Determine that all the plant equipment is operational. |
| 99) There are generally more limitations on authority the farther one __________ in the organization. a)Ascends b)Descends c)Moves horizontally d)Remains | b) Descends |
| 100) When an employee breaks the rules and requires discipline, who generally is responsible for administering it? a)Fellow employee. b)Personnel office. c)Supervisor. d)Upper management. | c) Supervisor |
Created by:
Ironhawk893