Test
Operation of Wastewater Treatment Plants Volume 2 Review
Preguntas del test (131)
1In the activated sludge process, the oxidation may be by chemical or biological processes.
- AVerdadero
- BFalso
2The removal of organisms from the activated sludge treatment process (sludge wasting) is a very important control technique.
- AVerdadero
- BFalso
3In an air distribution system, an air metering device should be located in a straight section of the air main on the suction side of the blower.
- AVerdadero
- BFalso
4In an aeration tank, the higher the food to microorganism (F/M) ratio, the more food and therefore a lower dissolved oxygen (DO) is needed.
- AVerdadero
- BFalso
5When considering a major process change, first review the plant data and then make only one major change at a time.
- AVerdadero
- BFalso
6Microbiology is another tool for operators to use in controlling the activated sludge process.
- AVerdadero
- BFalso
7The psychrophilic bacteria in anaerobic digesters appear to be able to survive temperatures well below freezing with little or no harm.
- AVerdadero
- BFalso
8Mixing is very important in a digester because it greatly speeds up the digestion rate.
- AVerdadero
- BFalso
9Operators should make every effort to pump as thick a sludge to the digester as possible.
- AVerdadero
- BFalso
10The withdrawal rate of sludge from a digester should be faster than a rate at which the gas production from the system is able to maintain a positive pressure in the digester.
- AVerdadero
- BFalso
11Aerobic sludge digestion completes the oxidation of volatile materials in the digester.
- AVerdadero
- BFalso
12The proper discharge of plant effluent is the final process for the operator.
- AVerdadero
- BFalso
13The principles for collecting samples for measuring dissolved oxygen are the same as for measuring temperature.
- AVerdadero
- BFalso
14 Site-specific safety procedures should be confirmed with your local safety regulatory agency.
- AVerdadero
- BFalso
15Always get air into the confined space before you enter to work and maintain the ventilation until you have left the space.
- AVerdadero
- BFalso
16The sense of smell is reliable for evaluating the presence of dangerous gases.
- AVerdadero
- BFalso
17Moving parts that create a contact hazard to employees must be guarded.
- AVerdadero
- BFalso
18When applying protective coatings in a clarifier, you can create an atmospheric hazard.
- AVerdadero
- BFalso
19In the laboratory, separate flammable, explosive, or special hazard items for storage in an approved manner.
- AVerdadero
- BFalso
20Hard hats, safety footwear, eye protection, and hearing protection apply to all personnel in designated areas and specific jobs.
- AVerdadero
- BFalso
21When you are performing plant maintenance, you must recognize tasks that may be beyond your capabilities or repair facilities, and you should request assistance when needed.
- AVerdadero
- BFalso
22The horizontal pump suction piping slopes downward toward the pump.
- AVerdadero
- BFalso
23Fuses are used to protect operators, wiring, main circuits, branch circuits, heaters, and motors.
- AVerdadero
- BFalso
24Electric motors are the machines most commonly used to convert electrical energy into mechanical energy.
- AVerdadero
- BFalso
25Valves, elbows, and other items that could disrupt the flow ahead of a meter can upset the accuracy and reliability of a flowmeter
- AVerdadero
- BFalso
26Safety is just as important in the laboratory as in the rest of the treatment plant.
- AVerdadero
- BFalso
27The shorter the time that elapses between sample collection and analysis, the more reliable will be the analytical results.
- AVerdadero
- BFalso
28The COD test is used to measure the strength of that are too toxic for the BOD test.
- AVerdadero
- BFalso
29Probably the most frequent use of computers is for word processing.
- AVerdadero
- BFalso
30Wastewater flows and other characteristics that can be sensed by instruments can be monitored by computers.
- AVerdadero
- BFalso
31When installing any computer program, be sure to check to see that it is doing what you expect it to do.
- AVerdadero
- BFalso
32Collection of data without analysis, interpretation, and use of results is a waste of time and money.
- AVerdadero
- BFalso
33Operators are likely to draw the line of best fit slightly differently as each operator will visualize a slightly different line (slope).
- AVerdadero
- BFalso
34Well-kept records will make the task of writing treatment plant cost and efficiency reports much easier.
- AVerdadero
- BFalso
35Records at most wastewater treatment facilities are kept daily and summarized on a monthly basis.
- AVerdadero
- BFalso
36You and your plant operation are partially judged by the information contained in your report, its style, and its appearance.
- AVerdadero
- BFalso
37The utility manager must provide a safer, cleaner work environment while constantly training and retraining operators to understand new technologies
- AVerdadero
- BFalso
38Establishing safe work procedures for new employees is a very important function of management.
- AVerdadero
- BFalso
39Good communication is an essential part of good management skills.
- AVerdadero
- BFalso
40Every utility needs an effective operations and maintenance program.
- AVerdadero
- BFalso
41The supervisor who has the responsibility for directing work activities must be safety conscious.
- AVerdadero
- BFalso
42operator must think, act, and promote safety if the utility is to achieve a good safety record.
- AVerdadero
- BFalso
43Why must the proper dissolved oxygen (DO) level be maintained in an aeration tank?
- ASo filamentous organisms will thrive and the sludge floc will settle properly
- BSo pinpoint floc will develop and be removed by the secondary clarifier
- CSo the contents of the aeration tank will be thoroughly mixed
- DSo the solids will settle properly and the plant effluent will be clear
44Why should weirs installed at the outlet or effluent end of the aeration tank be level?
- ATo comply with the plant's plans and specifications
- BTo keep the aeration tank balanced
- CTo prevent short-circuiting and an uneven distribution of solids in the effluent
- DTo provide a uniform appearing tank
45How can the mixed liquor suspended solids in the aeration tank be increased?
- ABy increasing the influent flows
- BBy reducing the aeration tank capacity
- CBy reducing the effluent flows
- DBy reducing the sludge wasting rate
46What is bound water?
- AA high-molecular-weight substance that is formed by either natural or synthetic processes
- BClouds of billowing sludge that occur throughout secondary clarifiers and sludge thickeners when the sludge does not settle properly
- CThe gathering together of fine particles after coagulation to form larger particles by a process of gentle mixing
- DWater contained within the cell mass of sludges or strongly held on the surface of colloidal particles
47What are raw sludge and scum?
- ASettled sludge solids that are removed from the bottom and the floating scum removed from the top of the aerators
- BSettled sludge solids that are removed from the bottom and the floating scum removed from the top of the clarifiers
- CSettled sludge solids that are removed from the bottom and the floating scum removed from the top of the digesters
- DUntreated solids and scum that are removed from the bar screens
48What is the purpose of a vacuum relief valve on an anaerobic sludge digester?
- APrevents a spark or flame from entering the digester
- BPrevents air from entering the digester or digester gas from escaping
- CRelieves excessive pressures in the digester so the water seal will not be blown out
- DRelieves excessive vacuums so the digester cover will not collapse
49Which item is the key to successful digester operation?
- ApH
- BRecirculated sludge
- CTemperature
- DVolatile acid/alkalinity relationship
50Successful operation of a surface discharge system depends on which factor?
- AAdequate budgets to meet the essential O & M requirements
- BAll operators being properly certified
- CConscientious operators using proper techniques for sampling and analysis
- DQualified regulators understanding the plant's O & M requirements
51What type of emergency operating equipment should be available for pumped discharge systems when there is a loss of power?
- AStandby generators
- BStandby monitors
- CStandby operators
- DStandby pumps
52What is a representative sample?
- AA collection of individual samples obtained at regular intervals, usually every one or two hours during a 24-hour time span
- BA collection of samples combined with other samples in proportion to the rate of flow when the sample was collected
- CA sample portion of material, water, or wastestream that is as nearly identical in content and consistency as possible to that in the larger body being sampled
- DA single sample of water collected at a particular time and place that represents the composition of the water only at that time and place
53 What is the best protection against the risk of infections and infectious diseases?
- AImmunization program
- BPersonal hygiene
- CPersonal protective equipment (PPE)
- DPersonnel safety courses
54What is the ideal method of dealing with any high-noise environment?
- AThe elimination or reduction of all sources through feasible engineering or administrative controls
- BThe scheduling of work in the high-noise environment when the equipment is not operating
- CThe selection of operators with a high level of noise tolerance to work in the high-noise environment
- DThe use of generous compensation packages when loss of hearing results
55What is the apparent cause of drowning when someone falls into a diffused aeration tank?
- AA strong undertow pulls the person under
- BThe aerator is too deep for a person to stand on the bottom
- CThe air in the water causes the person to sink to the bottom
- DThere is nothing to grab hold of to keep afloat or to pull oneself out of the aerator
56If your hands may come in contact with wastewater or sludge during sampling, how can you prevent the spread of disease?
- ADry hands in the sunlight when you have finished sampling
- BWear disposable, impervious gloves
- CWear heavy leather gloves
- DWear light, flexible, cotton gloves
57Which materials are consumed by a Class B fire?
- ACombustible metals, such as magnesium, sodium, zinc, and potassium
- BEnergized electrical equipment, such as starters, breakers, and motors
- CFlammable and combustible liquids, such as gasoline,oil, and grease
- DOrdinary combustibles, such as wood, paper, and cloth
58Why is a good maintenance program essential for a wastewater treatment plant?
- ASo operators can maintain their operator maintenance certificates
- BSo operators will have time to conduct plant tours
- CTo arrange for equipment vendors to observe their products
- DTo operate continuously at peak design efficiency
59How can pipelines that carry chlorine gas be purged to remove moisture?
- ABy using cold water
- BBy using dry air or nitrogen
- CBy using methane gas
- DBy using moist air
60Why do very few maintenance operators do the actual electrical repairs or troubleshooting?
- ABecause cost-effective training programs are rarely available for maintenance operators
- BBecause highly trained technicians are readily available at a lower cost than maintenance operators
- CBecause this is a highly specialized field and unqualified people can seriously injure themselves and
damage costly equipment - DBecause union regulations and negotiations forbid maintenance operators from performing this work
61What is voltage? Voltage is
- AA measure of power units used to rate electrical machines or motors or to indicate power in an electric circuit
- BA practical unit of electrical resistance
- CThe electrical pressure available to cause a flow of current when an electric circuit is closed
- DThe measurement of current or electron flow and is an indication of work being done
62What is a fuse?
- AA device that allows a motor to be run continuously at its rated horsepower without causing damage to the insulation system
- BA protective device having a strip or wire of fusible metal which, when placed in a circuit, will melt and break the electric circuit when subjected to an excessive temperature
- CA switch that is opened automatically when the current or voltage exceeds or falls below a certain limit
- DAn expression representing an electrical connection to earth or a large conductor that is at the earth's potential or neutral voltage
63When two or more pumps of the same size are installed, why should they be operated alternately?
- ATo ensure that all the pumps will fail simultaneously and can be replaced all at once
- BTo equalize wear, keep the motor windings dry, and distribute lubricant in the bearings
- CTo keep the load on the foundation and flow in the pipes balanced
- DTo minimize electricity consumption and system electrical hazards
64What do flow measurement transmitter instruments do?
- ACompare received signals with other values and send corrective or adjusting signals when necessary
- BMeasure the variable flow indicator and convert this value to a usable number
- CPick up the transmitted signal and convert it to a usable number
- DSend the flow variable to another device for conversion to a usable number
65Why should operators review the plans and specifications for pumps and lift stations?
- ATo be sure adequate provisions have been made for the station pumps, equipment, and instrumentation to be easily and properly operated and maintained
- BTo review the plans and specifications to ensure receipt of low bids
- CTo suggest contractors who could do an acceptable job
- DTo verify and confirm the consulting engineers' calculations
66In chemistry, to what does normality (N) refer?
- ASolution hazard
- BSolution strength
- CSolution toxicity
- DSolution volume
67What does the digester supernatant solids test measure?
- AThe degree of liquid-solids separation occurring when mixing is stopped in the digester
- BThe effectiveness of the digester mixing procedures
- CThe percent of settleable solids being returned to the plant headworks
- DThe strength of the supernatant that is removed from the digester
68Why should chlorine residual be removed before final discharge to a receiving stream?
- AFor protection of aquatic vegetation from toxic chemicals
- BFor protection of fish and other aquatic life
- CFor protection of swimmers from skin rashes
- DFor protection of water supplies from TTHMs
69What is aseptic?
- AA plastic tube that contains an exact amount of chemical or reagent
- BA representative portion of a sample. Often, an equally divided portion of a sample
- CA solution or liquid whose chemical makeup neutralizes acids or bases without a great change in pH
- DFree from the living germs of disease, fermentation, or putrefaction. Sterile
70What is the first question an operator should ask when considering the possibility of using a computer or expanding the use of computers?
- AHow can I find a computer course to improve my computer skills?
- BHow can I find funds in the budget to help me?
- CHow can I get the computer staff to assist me?
- DHow can I use a computer to help me do a better job?
71What does a SCADA system do?
- ACollects, stores, and analyzes information about all aspects of O & M, transmits alarm signals when necessary, and allows fingertip control of alarms, equipment, and processes
- BProvides standby power to operate critical pumps when power systems fail
- CScans plant facilities and reports unusual conditions to plant security
- DSurveys stakeholders and system users and reports
72What is the median?
- AThe difference between the largest and smallest measurement
- BThe measurement that occurs most frequently
- CThe middle measurement when the measurements are ranked in order of magnitude (size)
- DThe sum of all measurements divided by the number of measurements.
73What is a normal distribution of data?
- AThe geometric mean describes the distribution
- BThe mean, median, and mode values are different
- CThe mean, median, and mode values will be be approximately the same
- DThe percentile plotting points are different
74What is the main means by which operators who have information communicate with those who need it?
- ACommittee meetings
- BProfessional conferences
- CReport writing
- DTelephones
75Recorded data should enable the operator to determine how to perform which task?
- ADevelop tailgate safety sessions
- BOperate and maintain the plant
- CPromote qualified operators
- DSchedule plant tours
76What is planning?
- ADeciding who does what work and delegating authority to the appropriate operators
- BDetermining the goals, policies, procedures, and other elements to achieve the goals and objectives of the agency
- CGuiding, teaching, motivating, and supervising operators and utility staff members
- DTaking the steps necessary to ensure that essential activities are performed so that objectives will be achieved as planned
77What is authority?
- AAnswering to those above in the chain of command to explain how and why you have used your authority
- BThe act in which power is given to another person in the organization to accomplish a specific job
- CThe power and resources to do a specific job or to get that job done
- DWhen a manager gives power or responsibility to an employee, the employee ensures that the manager is informed of results or events
78How do you measure financial stability for a utility?
- ABy calculating the benefit/cost ratio for the utility
- BBy calculating the net revenue for the utility
- CBy calculating the operating ratio and the coverage ratio
- DBy calculating the rate of return on the utility's assets
79What is the operating ratio?
- AA measure of the ability of the utility to pay the principal and interest on loans and bonds in addition to any unexpected expenses
- BA measure of the total revenues divided by the total operating expenses
- CThe amount of money required annually to pay the interest on outstanding debts
- DThe rate of return on the funds expended on facilities
80What is SCADA?
- AA computer analytical system that continuously monitors water quality changes in the system
- BA computer budgeting system that records and monitors costs and revenues
- CA computer intelligence system that eliminates many tasks performed by operators
- DA computer-monitored alarm, response, control, and data acquisition system used to monitor and adjust the operation of equipment
81What is the purpose of a safety policy statement?
- ATo comply with OSHA regulations
- BTo create the proper atmosphere to impress insurance companies
- CTo let employees know that the safety program has the full support of the agency and its management
- DTo let the media and the public know that the agency is safety conscious
82When wastewater enters an activated sludge plant, the preliminary treatment processes remove which pollutants?
- ACoarse or heavy solids (grit)
- BDebris, such as roots, rags, and boards
- CFloatable and settleable material
- DNutrients
- ESoluble or finely divided suspended materials
83Which items can cause an unsuitable environment for the activated sludge process?
- AFailure to supply enough oxygen
- BHigh concentrations of acids, bases, and other toxic substances
- CMaintaining proper solids (floc mass) concentration in the aerator
- DProper adjustment of the waste sludge pumping rate
- EUneven flows of wastewater, which can cause overfeeding or starvation
84What information should be recorded when testing pumps?
- ADate of the test
- BLocation of the pump
- CName of the operator
- DPump discharge (flow)
- EPump discharge pressure
85Which plant changes could cause an activated sludge plant to become upset?
- AChanges in operators' shifts
- BChanges in the sampling program
- CFlow or waste changes
- DHigh solids in the digester supernatant
- ETemperature changes
86Which items are possible causes of sludge bulking?
- AFilamentous organisms growing from one floc mass to another
- BLow DO
- CLow nutrient concentrations
- DLow pH
- EProduction of a highly jelly-like, waterlogged sludge that has a very low sludge density
87Which items should be checked before starting a new sequencing batch reactor (SBR) plant?
- ABe sure the plant has an up-to-date O & M manual and a set of as-built plans (record drawings)
- BCheck and flush pipe systems and remove any refuse or debris left in them during construction
- CEnsure protective safety guards are installed on rotating equipment, open tanks, and channels
- DMake sure tanks are clean; be sure all debris, boards,ladders, and tools have been removed
- ETo the extent possible, operate and test all equipment before admitting wastewater for treatment
88Operators can achieve good digester operation by controlling which items?
- ALoading rate or food supply (organic solids)
- BMixing
- CReproduction rate of acid formers and methane fermenters
- DTemperature
- EVolatile acid/alkalinity relationship
89How can a scum blanket be controlled in a digester?
- ABy adequate mixing
- BBy chemicals
- CBy heat
- DBy methane fermenters
- EBy volatile acids
90Where does struvite scale sometimes form?
- AIn anaerobic digesters
- BIn downstream chlorination equipment
- CIn downstream digested sludge concentration equipment
- DIn downstream digested sludge handling equipment
- EIn downstream effluent weirs
91When operators are making their rounds inspecting their plant, they should be alert and investigate and record
which items? Anything that- AFeels different (hotter or vibrating more)
- BLooks different or unusual
- CSmells different
- DSounds different
- ETastes different
92What types of problems are encountered when operating aerobic digesters?
- AFloating sludge
- BFluctuating BODs
- COdors
- DScum
- EWet solids
93When reviewing the specifications for sludge digestion and solids handling facilities, which items should operators check?
- AAdequate supply of equipment operation and maintenance manuals
- BEquipment warranties and responsibility for acceptance testing
- CInstrumentation—remote and local control board items and recorders are provided
- DPaints and protective coatings
- EPerformance requirements and capabilities
94Prior to discharge to surface waters, why must wastewater be treated?
- ATo prevent nuisances due to odors or unsightliness
- BTo prevent the wastewater from interfering with the many uses of surface waters
- CTo produce documentation for the record keeping system
- DTo protect the health of the people who may come in contact with it
- ETo provide water for discharge sampling and analysis
95Which operating procedures should be developed for the start-up of a plant?
- AInspect the discharge line, where possible
- BLook at the water surface over the diffuser or outfall pipe
- CObserve the flow entering the discharge system for visible pollutants
- DOpen all appropriate valves
- EStart the pumps (unless it is a gravity system)
96Which items are probable causes of floatables in pond effluents?
- AExcessive floatables and scum on the surface
- BExcessive solids accumulated on the bottom have gasified and floated to the surface
- CExcessive velocity or insufficient detention time
- DOutlet baffle is not at the proper location
- ETemperature or weather conditions may favor a particular species of algae
97Under what conditions may the frequency of sampling be increased?
- AWhen the lab is not meeting QA/QC requirements
- BWhen the lab staff have the opportunity to analyze more samples
- CWhen the receiving waters are not meeting established water quality standards
- DWhen the treatment plant effluent is not meeting discharge requirements
- EWhen the treatment plant staff increases and more time is available to collect more samples
98A confined space may be defined as any space that meets Which conditions?
- AAllows more than one employee to fit into the space and work
- BHas limited or restricted means for entry or exit
- CIs large enough and so configured that an employee can bodily enter and perform assigned work
- DIs not designed for continuous employee occupancy
- ERequires employees to wear personal protective equipment (PPE)
99The hazard warnings on containers of hazardous chemicals at your plant should contain emergency guide information on which specific categories?
- AFlammability
- BHealth
- CNutrients
- DPermeability
- EReactivity
100Which items could be included in your plant's fire prevention plan?
- ADevelop written response procedures for reacting to a fire situation, to include evacuation
- BProvide periodic cleanup of weeds or other vegetation in and around the plant
- CProvide required service on all fire detection and response equipment (inspection, service, hydrostatic
- DRegulate the use, storage, and disposal of all combustible materials/substances
- ERoutinely inspect fire doors to ensure proper operation and unobstructed access
101The primary use for polymers in wastewater treatment is the conditioning of sludge to facilitate removal of water in
which subsequent treatment processes?- AAerobic digesters
- BBelt filter presses
- CCentrifuges
- DDissolved air flotation thickeners
- EGravity belt thickeners
102Working safely in the laboratory involves which basic safety procedures and practices?
- AAlways check labels on bottles to make sure that the proper chemical is selected
- BNever handle chemicals with your bare hands
- CNever use laboratory glassware for a cup or food dish
- DUse care in making rubber-to-glass connections
- EUse proper safety goggles or a face shield in all tests where there is danger to the eyes
103Which paperwork items can be helpful in identifying the causes of accidents and developing corrective procedures?
- AAccident report forms
- BFacility plans and specifications and plant inspection reports
- CPlant's safety policy
- DPlant's safety rules
- ESupervisors' guidelines on how to promote and implement a safety plan
104 What could cause a pump to run dry?
- AExcessive leakage when pumping against a high head
- BHoles (spacing) being too large in the suction intake screen
- CImpeller rotating too fast and causing cavitation
- DLack of proper priming when starting
- ELoss of suction when operating
105Which items are primary sources of unsatisfactory AC brush and ring performance?
- ADisturbing external condition
- BImproper load or service condition
- CMechanical fault in the machine
- DPoor machine design
- EPoor preparation and care of the machine
106When performing pump station electrical equipment maintenance tasks, which items should be checked and inspected annually?
- AAll panel instruments
- BAll switch gear and distribution equipment
- CEnclosures
- DFuses and circuit breakers
- EWiring integrity
107Which items are causes of motor malfunction or failure?
- ABearing failures
- BContaminants
- COld age
- DOverload (thermal)
- ESingle phasing
108When troubleshooting any motor control that has developed trouble, the qualified maintenance operator should be able to do which of the following?
- AExamine all unusual factors
- BFind the cause of the problem
- CKnow what should happen when a switch is pushed
- DMake a visual inspection
- ERepair the problem and eliminate the cause, if possible
109Plugged pipelines are encountered in lines transporting which types of materials and liquids?
- ADigested sludge
- BEffluent
- CGrit
- DRaw sludge
- EScum
110Which factors will cause sludge lines to plug more often?
- AWhen industrial wastes are discharged after a fine screening process
- BWhen plant effluent and reclaimed effluent are pumped through the lines
- CWhen RAS (return activated sludge) and WAS (waste activated sludge) are pumped through the lines
- DWhen scum and raw sludge are pumped through the same line
- EWhen stormwaters carry in grit and silt that are not effectively removed by the grit removal facilities
111When examining lift station prints, operators should ensure adequate provisions have been made for which items?
- AFloors should be sloped to provide drainage, where needed, and drains should be located in low spots
- BOverhead clearances of power lines, trees, and roofs should be adequate for a crane to remove large equipment
- CThe alarm system should signal high water levels in the wet well and water on the floor of the dry well
- DThere should be room to use hydrolifts, cranes, and high-velocity cleaners, as needed
- EThere should be sufficient room to set up portable pumping units or other necessary equipment in cases of major station failures or disasters
112When working with chemicals and other materials in the wastewater treatment plant laboratory, which hazards can
be minimized by using proper techniques and equipment?- ABurns
- BElectric shock
- CInfectious materials
- DPoisons
- EToxic fumes
113Why must hydrogen sulfide gas be measured in the atmosphere?
- ABecause it causes corrosion
- BBecause it causes odors
- CBecause it increases the fuel value of sewer gas
- DBecause it is flammable and explosive under certain conditions
- EBecause it is toxic to your respiratory system
114Which precautions should be considered when measuring the chemical oxygen demand (COD) of a sample?
- AFlasks and condensers should be clean and free from grease or other oxidizable materials
- BThe standard ferrous ammonium sulfate solution is unstable and should be standardized daily
- CThe wastewater sample should be well mixed
- DUse a wide-tip pipet to ensure a representative sample is added
- EUse extreme caution and safety precautions when handling the chemicals used for the test
115Which precautions should be considered when using a dissolved oxygen (DO) probe?
- ADissolved inorganic salts, such as found in seawater, can influence the readings from a probe
- BDo not place the probe directly over a diffuser because you want to measure the dissolved oxygen in the water being treated, not the oxygen in the air supply to the aerator
- CKeep the membrane in the tip of the probe from drying out
- DPeriodically check the calibration of the probe
- EReactive compounds, such as reactive gases and sulfur compounds, can interfere with the output of a probe
116Sulfate ions in wastewater are indirectly responsible for which serious problems?
- AIndigestion
- BLaxative effects
- COdor
- DSewer corrosion problems
- EToxic gas
117Which items are general types of computer applications in wastewater treatment plants??
- ACommunications
- BData analysis
- CRecordkeeping
- DReport generation
- ESystems monitoring
118If the proper lab results are entered into the computer, the computer can calculate and print out which items?
- AChemical dosages
- BF/Ms (Food to Microorganism ratios)
- CMCRTs (Mean Cell Residence Times)
- DPercent removals
- ESuspended solids, BOD, or COD loadings
119Which programs are typically included in general purpose software packages?
- ADatabase management
- BGraphics
- CPlant template
- DSpreadsheet
- EWord processing
120Which items can typically be monitored, recorded, and controlled by computers in a wastewater treatment plant?
- AAeration basin dissolved oxygen
- BAnaerobic sludge digester gas production
- CChlorine contact time
- DInfluent flow control gates and valves
- ESecondary clarifier sludge pumping
121When preparing to plot data in a bar graph, what information must first be determined?
- AClass midpoint
- BDistribution of data
- CMeasurement frequencies
- DSpread of data
- EWidth of the class interval
122Why are records important?
- AThey are needed to fill unused space in storage rooms and filing cabinets
- BThey are needed to show the type and frequency of maintenance and to evaluate the effectiveness of maintenance programs
- CThey can indicate plant efficiency, performance, past problems, and potential problems
- DThey can provide data upon which to base recommendations for modifying plant operation and facilities
- EThey may be needed in damage suits brought against the district or municipality
123A list of the minimum daily records kept at a fairly large treatment plant with digester tanks may include which items?
- AChlorine use (lbs or kg)
- BInfluent and effluent temperatures
- CpH of influent and effluent
- DPrecipitation and air temperature
- ERaw wastewater flow (MGD from totalizer)
124Which items are basic principles common to good report writing?
- AKnow the purpose and objective of your report
- BKnow your subject
- COmit any recommendations
- DOrganize the report to present your ideas in a logical order
- ETailor your report to the person or persons to whom it is directed
125Which items are guidelines for preparing a report?
- AArrange the ideas in a logical sequence
- BBegin writing
- CGather material needed to support the ideas to be presented in the report
- DList ideas and topics you plan to cover in the report
- EPrepare conclusions and recommendations after writing the main body of the report
126The utility manager's staffing responsibilities include which tasks?
- AEvaluating employee performance
- BIssuing orders and instructions
- CProviding opportunities for advancement for operators and staff
- DSelecting and training employees
- ETeaching classes
127Which items are important steps in the process of hiring and selecting a new operator?
- AAdvertising the position
- BAvoiding unacceptable pre-employment inquiries
- CInterviewing applicants
- DPaper screening
- ESelecting the most qualified candidate
128Which items may serve as a guide for both the employee and the supervisor when dealing with a confrontation regarding employee performance issues?
- AAim for a permanent solution
- BCreate a private environment
- CKeep your language appropriate
- DListen very carefully
- EMaintain an adult approach
129The total revenue of a utility comes from revenue generated by which sources?
- AChemicals
- BHook-up charges
- CInterest income
- DTaxes or assessments
- EUser fees
130What is predictive maintenance?
- AA method of establishing baseline performance data
- BMonitoring performance criteria over a period of time
- CObserving changes in performance so that failure can be predicted and maintenance can be performed on a planned, scheduled basis
- DThe same as corrective maintenance
- EThe same as proactive maintenance
131How can a supervisor be partially or fully responsible for an accident?
- ABy causing unsafe acts to take place
- BBy disregarding an unsafe work environment
- CBy overlooking or failing to consider any number of safety hazards
- DBy requiring operators to follow safe procedures
- EBy requiring work to be performed in haste
Información
- Descripción
- Wastewater Wastewater Treatment Study Material Test sobre Operation of Wastewater Treatment Plants Volume 2 Review, creado por Dean Lampman el 21/01/2018.
- Autor
- Dean Lampman
- Idioma
- English
- Visitas
- 580
- Etiquetas
- Valoración
- 5,0 de 5 · 1 valoración Valora este test