Dean Lampman
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Wastewater Wastewater Treatment Study Material Quiz on Operation of Wastewater Treatment Plants Volume 2 Review, created by Dean Lampman on 21/01/2018.

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Operation of Wastewater Treatment Plants Volume 2 Review

Question 1 of 131

1

In the activated sludge process, the oxidation may be by chemical or biological processes.

Select one of the following:

  • True
  • False

Explanation

Question 2 of 131

1

The removal of organisms from the activated sludge treatment process (sludge wasting) is a very important control technique.

Select one of the following:

  • True
  • False

Explanation

Question 3 of 131

1

In 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.

Select one of the following:

  • True
  • False

Explanation

Question 4 of 131

1

In an aeration tank, the higher the food to microorganism (F/M) ratio, the more food and therefore a lower dissolved oxygen (DO) is needed.

Select one of the following:

  • True
  • False

Explanation

Question 5 of 131

1

When considering a major process change, first review the plant data and then make only one major change at a time.

Select one of the following:

  • True
  • False

Explanation

Question 6 of 131

1

Microbiology is another tool for operators to use in controlling the activated sludge process.

Select one of the following:

  • True
  • False

Explanation

Question 7 of 131

1

The psychrophilic bacteria in anaerobic digesters appear to be able to survive temperatures well below freezing with little or no harm.

Select one of the following:

  • True
  • False

Explanation

Question 8 of 131

1

Mixing is very important in a digester because it greatly speeds up the digestion rate.

Select one of the following:

  • True
  • False

Explanation

Question 9 of 131

1

Operators should make every effort to pump as thick a sludge to the digester as possible.

Select one of the following:

  • True
  • False

Explanation

Question 10 of 131

1

The 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.

Select one of the following:

  • True
  • False

Explanation

Question 11 of 131

1

Aerobic sludge digestion completes the oxidation of volatile materials in the digester.

Select one of the following:

  • True
  • False

Explanation

Question 12 of 131

1

The proper discharge of plant effluent is the final process for the operator.

Select one of the following:

  • True
  • False

Explanation

Question 13 of 131

1

The principles for collecting samples for measuring dissolved oxygen are the same as for measuring temperature.

Select one of the following:

  • True
  • False

Explanation

Question 14 of 131

1

Site-specific safety procedures should be confirmed with your local safety regulatory agency.

Select one of the following:

  • True
  • False

Explanation

Question 15 of 131

1

Always get air into the confined space before you enter to work and maintain the ventilation until you have left the space.

Select one of the following:

  • True
  • False

Explanation

Question 16 of 131

1

The sense of smell is reliable for evaluating the presence of dangerous gases.

Select one of the following:

  • True
  • False

Explanation

Question 17 of 131

1

Moving parts that create a contact hazard to employees must be guarded.

Select one of the following:

  • True
  • False

Explanation

Question 18 of 131

1

When applying protective coatings in a clarifier, you can create an atmospheric hazard.

Select one of the following:

  • True
  • False

Explanation

Question 19 of 131

1

In the laboratory, separate flammable, explosive, or special hazard items for storage in an approved manner.

Select one of the following:

  • True
  • False

Explanation

Question 20 of 131

1

Hard hats, safety footwear, eye protection, and hearing protection apply to all personnel in designated areas and specific jobs.

Select one of the following:

  • True
  • False

Explanation

Question 21 of 131

1

When 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.

Select one of the following:

  • True
  • False

Explanation

Question 22 of 131

1

The horizontal pump suction piping slopes downward toward the pump.

Select one of the following:

  • True
  • False

Explanation

Question 23 of 131

1

Fuses are used to protect operators, wiring, main circuits, branch circuits, heaters, and motors.

Select one of the following:

  • True
  • False

Explanation

Question 24 of 131

1

Electric motors are the machines most commonly used to convert electrical energy into mechanical energy.

Select one of the following:

  • True
  • False

Explanation

Question 25 of 131

1

Valves, elbows, and other items that could disrupt the flow ahead of a meter can upset the accuracy and reliability of a flowmeter

Select one of the following:

  • True
  • False

Explanation

Question 26 of 131

1

Safety is just as important in the laboratory as in the rest of the treatment plant.

Select one of the following:

  • True
  • False

Explanation

Question 27 of 131

1

The shorter the time that elapses between sample collection and analysis, the more reliable will be the analytical results.

Select one of the following:

  • True
  • False

Explanation

Question 28 of 131

1

The COD test is used to measure the strength of that are too toxic for the BOD test.

Select one of the following:

  • True
  • False

Explanation

Question 29 of 131

1

Probably the most frequent use of computers is for word processing.

Select one of the following:

  • True
  • False

Explanation

Question 30 of 131

1

Wastewater flows and other characteristics that can be sensed by instruments can be monitored by computers.

Select one of the following:

  • True
  • False

Explanation

Question 31 of 131

1

When installing any computer program, be sure to check to see that it is doing what you expect it to do.

Select one of the following:

  • True
  • False

Explanation

Question 32 of 131

1

Collection of data without analysis, interpretation, and use of results is a waste of time and money.

Select one of the following:

  • True
  • False

Explanation

Question 33 of 131

1

Operators are likely to draw the line of best fit slightly differently as each operator will visualize a slightly different line (slope).

Select one of the following:

  • True
  • False

Explanation

Question 34 of 131

1

Well-kept records will make the task of writing treatment plant cost and efficiency reports much easier.

Select one of the following:

  • True
  • False

Explanation

Question 35 of 131

1

Records at most wastewater treatment facilities are kept daily and summarized on a monthly basis.

Select one of the following:

  • True
  • False

Explanation

Question 36 of 131

1

You and your plant operation are partially judged by the information contained in your report, its style, and its appearance.

Select one of the following:

  • True
  • False

Explanation

Question 37 of 131

1

The utility manager must provide a safer, cleaner work environment while constantly training and retraining operators to understand new technologies

Select one of the following:

  • True
  • False

Explanation

Question 38 of 131

1

Establishing safe work procedures for new employees is a very important function of management.

Select one of the following:

  • True
  • False

Explanation

Question 39 of 131

1

Good communication is an essential part of good management skills.

Select one of the following:

  • True
  • False

Explanation

Question 40 of 131

1

Every utility needs an effective operations and maintenance program.

Select one of the following:

  • True
  • False

Explanation

Question 41 of 131

1

The supervisor who has the responsibility for directing work activities must be safety conscious.

Select one of the following:

  • True
  • False

Explanation

Question 42 of 131

1

operator must think, act, and promote safety if the utility is to achieve a good safety record.

Select one of the following:

  • True
  • False

Explanation

Question 43 of 131

1

Why must the proper dissolved oxygen (DO) level be maintained in an aeration tank?

Select one of the following:

  • So filamentous organisms will thrive and the sludge floc will settle properly

  • So pinpoint floc will develop and be removed by the secondary clarifier

  • So the contents of the aeration tank will be thoroughly mixed

  • So the solids will settle properly and the plant effluent will be clear

Explanation

Question 44 of 131

1

Why should weirs installed at the outlet or effluent end of the aeration tank be level?

Select one of the following:

  • To comply with the plant's plans and specifications

  • To keep the aeration tank balanced

  • To prevent short-circuiting and an uneven distribution of solids in the effluent

  • To provide a uniform appearing tank

Explanation

Question 45 of 131

1

How can the mixed liquor suspended solids in the aeration tank be increased?

Select one of the following:

  • By increasing the influent flows

  • By reducing the aeration tank capacity

  • By reducing the effluent flows

  • By reducing the sludge wasting rate

Explanation

Question 46 of 131

1

What is bound water?

Select one of the following:

  • A high-molecular-weight substance that is formed by either natural or synthetic processes

  • Clouds of billowing sludge that occur throughout secondary clarifiers and sludge thickeners when the sludge does not settle properly

  • The gathering together of fine particles after coagulation to form larger particles by a process of gentle mixing

  • Water contained within the cell mass of sludges or strongly held on the surface of colloidal particles

Explanation

Question 47 of 131

1

What are raw sludge and scum?

Select one of the following:

  • Settled sludge solids that are removed from the bottom and the floating scum removed from the top of the aerators

  • Settled sludge solids that are removed from the bottom and the floating scum removed from the top of the clarifiers

  • Settled sludge solids that are removed from the bottom and the floating scum removed from the top of the digesters

  • Untreated solids and scum that are removed from the bar screens

Explanation

Question 48 of 131

1

What is the purpose of a vacuum relief valve on an anaerobic sludge digester?

Select one of the following:

  • Prevents a spark or flame from entering the digester

  • Prevents air from entering the digester or digester gas from escaping

  • Relieves excessive pressures in the digester so the water seal will not be blown out

  • Relieves excessive vacuums so the digester cover will not collapse

Explanation

Question 49 of 131

1

Which item is the key to successful digester operation?

Select one of the following:

  • pH

  • Recirculated sludge

  • Temperature

  • Volatile acid/alkalinity relationship

Explanation

Question 50 of 131

1

Successful operation of a surface discharge system depends on which factor?

Select one of the following:

  • Adequate budgets to meet the essential O & M requirements

  • All operators being properly certified

  • Conscientious operators using proper techniques for sampling and analysis

  • Qualified regulators understanding the plant's O & M requirements

Explanation

Question 51 of 131

1

What type of emergency operating equipment should be available for pumped discharge systems when there is a loss of power?

Select one of the following:

  • Standby generators

  • Standby monitors

  • Standby operators

  • Standby pumps

Explanation

Question 52 of 131

1

What is a representative sample?

Select one of the following:

  • A collection of individual samples obtained at regular intervals, usually every one or two hours during a 24-hour time span

  • A collection of samples combined with other samples in proportion to the rate of flow when the sample was collected

  • A 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

  • A single sample of water collected at a particular time and place that represents the composition of the water only at that time and place

Explanation

Question 53 of 131

1

What is the best protection against the risk of infections and infectious diseases?

Select one of the following:

  • Immunization program

  • Personal hygiene

  • Personal protective equipment (PPE)

  • Personnel safety courses

Explanation

Question 54 of 131

1

What is the ideal method of dealing with any high-noise environment?

Select one of the following:

  • The elimination or reduction of all sources through feasible engineering or administrative controls

  • The scheduling of work in the high-noise environment when the equipment is not operating

  • The selection of operators with a high level of noise tolerance to work in the high-noise environment

  • The use of generous compensation packages when loss of hearing results

Explanation

Question 55 of 131

1

What is the apparent cause of drowning when someone falls into a diffused aeration tank?

Select one of the following:

  • A strong undertow pulls the person under

  • The aerator is too deep for a person to stand on the bottom

  • The air in the water causes the person to sink to the bottom

  • There is nothing to grab hold of to keep afloat or to pull oneself out of the aerator

Explanation

Question 56 of 131

1

If your hands may come in contact with wastewater or sludge during sampling, how can you prevent the spread of disease?

Select one of the following:

  • Dry hands in the sunlight when you have finished sampling

  • Wear disposable, impervious gloves

  • Wear heavy leather gloves

  • Wear light, flexible, cotton gloves

Explanation

Question 57 of 131

1

Which materials are consumed by a Class B fire?

Select one of the following:

  • Combustible metals, such as magnesium, sodium, zinc, and potassium

  • Energized electrical equipment, such as starters, breakers, and motors

  • Flammable and combustible liquids, such as gasoline,oil, and grease

  • Ordinary combustibles, such as wood, paper, and cloth

Explanation

Question 58 of 131

1

Why is a good maintenance program essential for a wastewater treatment plant?

Select one of the following:

  • So operators can maintain their operator maintenance certificates

  • So operators will have time to conduct plant tours

  • To arrange for equipment vendors to observe their products

  • To operate continuously at peak design efficiency

Explanation

Question 59 of 131

1

How can pipelines that carry chlorine gas be purged to remove moisture?

Select one of the following:

  • By using cold water

  • By using dry air or nitrogen

  • By using methane gas

  • By using moist air

Explanation

Question 60 of 131

1

Why do very few maintenance operators do the actual electrical repairs or troubleshooting?

Select one of the following:

  • Because cost-effective training programs are rarely available for maintenance operators

  • Because highly trained technicians are readily available at a lower cost than maintenance operators

  • Because this is a highly specialized field and unqualified people can seriously injure themselves and
    damage costly equipment

  • Because union regulations and negotiations forbid maintenance operators from performing this work

Explanation

Question 61 of 131

1

What is voltage? Voltage is

Select one of the following:

  • A measure of power units used to rate electrical machines or motors or to indicate power in an electric circuit

  • A practical unit of electrical resistance

  • The electrical pressure available to cause a flow of current when an electric circuit is closed

  • The measurement of current or electron flow and is an indication of work being done

Explanation

Question 62 of 131

1

What is a fuse?

Select one of the following:

  • A device that allows a motor to be run continuously at its rated horsepower without causing damage to the insulation system

  • A 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

  • A switch that is opened automatically when the current or voltage exceeds or falls below a certain limit

  • An expression representing an electrical connection to earth or a large conductor that is at the earth's potential or neutral voltage

Explanation

Question 63 of 131

1

When two or more pumps of the same size are installed, why should they be operated alternately?

Select one of the following:

  • To ensure that all the pumps will fail simultaneously and can be replaced all at once

  • To equalize wear, keep the motor windings dry, and distribute lubricant in the bearings

  • To keep the load on the foundation and flow in the pipes balanced

  • To minimize electricity consumption and system electrical hazards

Explanation

Question 64 of 131

1

What do flow measurement transmitter instruments do?

Select one of the following:

  • Compare received signals with other values and send corrective or adjusting signals when necessary

  • Measure the variable flow indicator and convert this value to a usable number

  • Pick up the transmitted signal and convert it to a usable number

  • Send the flow variable to another device for conversion to a usable number

Explanation

Question 65 of 131

1

Why should operators review the plans and specifications for pumps and lift stations?

Select one of the following:

  • To be sure adequate provisions have been made for the station pumps, equipment, and instrumentation to be easily and properly operated and maintained

  • To review the plans and specifications to ensure receipt of low bids

  • To suggest contractors who could do an acceptable job

  • To verify and confirm the consulting engineers' calculations

Explanation

Question 66 of 131

1

In chemistry, to what does normality (N) refer?

Select one of the following:

  • Solution hazard

  • Solution strength

  • Solution toxicity

  • Solution volume

Explanation

Question 67 of 131

1

What does the digester supernatant solids test measure?

Select one of the following:

  • The degree of liquid-solids separation occurring when mixing is stopped in the digester

  • The effectiveness of the digester mixing procedures

  • The percent of settleable solids being returned to the plant headworks

  • The strength of the supernatant that is removed from the digester

Explanation

Question 68 of 131

1

Why should chlorine residual be removed before final discharge to a receiving stream?

Select one of the following:

  • For protection of aquatic vegetation from toxic chemicals

  • For protection of fish and other aquatic life

  • For protection of swimmers from skin rashes

  • For protection of water supplies from TTHMs

Explanation

Question 69 of 131

1

What is aseptic?

Select one of the following:

  • A plastic tube that contains an exact amount of chemical or reagent

  • A representative portion of a sample. Often, an equally divided portion of a sample

  • A solution or liquid whose chemical makeup neutralizes acids or bases without a great change in pH

  • Free from the living germs of disease, fermentation, or putrefaction. Sterile

Explanation

Question 70 of 131

1

What is the first question an operator should ask when considering the possibility of using a computer or expanding the use of computers?

Select one of the following:

  • How can I find a computer course to improve my computer skills?

  • How can I find funds in the budget to help me?

  • How can I get the computer staff to assist me?

  • How can I use a computer to help me do a better job?

Explanation

Question 71 of 131

1

What does a SCADA system do?

Select one of the following:

  • Collects, stores, and analyzes information about all aspects of O & M, transmits alarm signals when necessary, and allows fingertip control of alarms, equipment, and processes

  • Provides standby power to operate critical pumps when power systems fail

  • Scans plant facilities and reports unusual conditions to plant security

  • Surveys stakeholders and system users and reports

Explanation

Question 72 of 131

1

What is the median?

Select one of the following:

  • The difference between the largest and smallest measurement

  • The measurement that occurs most frequently

  • The middle measurement when the measurements are ranked in order of magnitude (size)

  • The sum of all measurements divided by the number of measurements.

Explanation

Question 73 of 131

1

What is a normal distribution of data?

Select one of the following:

  • The geometric mean describes the distribution

  • The mean, median, and mode values are different

  • The mean, median, and mode values will be be approximately the same

  • The percentile plotting points are different

Explanation

Question 74 of 131

1

What is the main means by which operators who have information communicate with those who need it?

Select one of the following:

  • Committee meetings

  • Professional conferences

  • Report writing

  • Telephones

Explanation

Question 75 of 131

1

Recorded data should enable the operator to determine how to perform which task?

Select one of the following:

  • Develop tailgate safety sessions

  • Operate and maintain the plant

  • Promote qualified operators

  • Schedule plant tours

Explanation

Question 76 of 131

1

What is planning?

Select one of the following:

  • Deciding who does what work and delegating authority to the appropriate operators

  • Determining the goals, policies, procedures, and other elements to achieve the goals and objectives of the agency

  • Guiding, teaching, motivating, and supervising operators and utility staff members

  • Taking the steps necessary to ensure that essential activities are performed so that objectives will be achieved as planned

Explanation

Question 77 of 131

1

What is authority?

Select one of the following:

  • Answering to those above in the chain of command to explain how and why you have used your authority

  • The act in which power is given to another person in the organization to accomplish a specific job

  • The power and resources to do a specific job or to get that job done

  • When a manager gives power or responsibility to an employee, the employee ensures that the manager is informed of results or events

Explanation

Question 78 of 131

1

How do you measure financial stability for a utility?

Select one of the following:

  • By calculating the benefit/cost ratio for the utility

  • By calculating the net revenue for the utility

  • By calculating the operating ratio and the coverage ratio

  • By calculating the rate of return on the utility's assets

Explanation

Question 79 of 131

1

What is the operating ratio?

Select one of the following:

  • A measure of the ability of the utility to pay the principal and interest on loans and bonds in addition to any unexpected expenses

  • A measure of the total revenues divided by the total operating expenses

  • The amount of money required annually to pay the interest on outstanding debts

  • The rate of return on the funds expended on facilities

Explanation

Question 80 of 131

1

What is SCADA?

Select one of the following:

  • A computer analytical system that continuously monitors water quality changes in the system

  • A computer budgeting system that records and monitors costs and revenues

  • A computer intelligence system that eliminates many tasks performed by operators

  • A computer-monitored alarm, response, control, and data acquisition system used to monitor and adjust the operation of equipment

Explanation

Question 81 of 131

1

What is the purpose of a safety policy statement?

Select one of the following:

  • To comply with OSHA regulations

  • To create the proper atmosphere to impress insurance companies

  • To let employees know that the safety program has the full support of the agency and its management

  • To let the media and the public know that the agency is safety conscious

Explanation

Question 82 of 131

1

When wastewater enters an activated sludge plant, the preliminary treatment processes remove which pollutants?

Select one or more of the following:

  • Coarse or heavy solids (grit)

  • Debris, such as roots, rags, and boards

  • Floatable and settleable material

  • Nutrients

  • Soluble or finely divided suspended materials

Explanation

Question 83 of 131

1

Which items can cause an unsuitable environment for the activated sludge process?

Select one or more of the following:

  • Failure to supply enough oxygen

  • High concentrations of acids, bases, and other toxic substances

  • Maintaining proper solids (floc mass) concentration in the aerator

  • Proper adjustment of the waste sludge pumping rate

  • Uneven flows of wastewater, which can cause overfeeding or starvation

Explanation

Question 84 of 131

1

What information should be recorded when testing pumps?

Select one or more of the following:

  • Date of the test

  • Location of the pump

  • Name of the operator

  • Pump discharge (flow)

  • Pump discharge pressure

Explanation

Question 85 of 131

1

Which plant changes could cause an activated sludge plant to become upset?

Select one or more of the following:

  • Changes in operators' shifts

  • Changes in the sampling program

  • Flow or waste changes

  • High solids in the digester supernatant

  • Temperature changes

Explanation

Question 86 of 131

1

Which items are possible causes of sludge bulking?

Select one or more of the following:

  • Filamentous organisms growing from one floc mass to another

  • Low DO

  • Low nutrient concentrations

  • Low pH

  • Production of a highly jelly-like, waterlogged sludge that has a very low sludge density

Explanation

Question 87 of 131

1

Which items should be checked before starting a new sequencing batch reactor (SBR) plant?

Select one or more of the following:

  • Be sure the plant has an up-to-date O & M manual and a set of as-built plans (record drawings)

  • Check and flush pipe systems and remove any refuse or debris left in them during construction

  • Ensure protective safety guards are installed on rotating equipment, open tanks, and channels

  • Make sure tanks are clean; be sure all debris, boards,ladders, and tools have been removed

  • To the extent possible, operate and test all equipment before admitting wastewater for treatment

Explanation

Question 88 of 131

1

Operators can achieve good digester operation by controlling which items?

Select one or more of the following:

  • Loading rate or food supply (organic solids)

  • Mixing

  • Reproduction rate of acid formers and methane fermenters

  • Temperature

  • Volatile acid/alkalinity relationship

Explanation

Question 89 of 131

1

How can a scum blanket be controlled in a digester?

Select one or more of the following:

  • By adequate mixing

  • By chemicals

  • By heat

  • By methane fermenters

  • By volatile acids

Explanation

Question 90 of 131

1

Where does struvite scale sometimes form?

Select one or more of the following:

  • In anaerobic digesters

  • In downstream chlorination equipment

  • In downstream digested sludge concentration equipment

  • In downstream digested sludge handling equipment

  • In downstream effluent weirs

Explanation

Question 91 of 131

1

When operators are making their rounds inspecting their plant, they should be alert and investigate and record
which items? Anything that

Select one or more of the following:

  • Feels different (hotter or vibrating more)

  • Looks different or unusual

  • Smells different

  • Sounds different

  • Tastes different

Explanation

Question 92 of 131

1

What types of problems are encountered when operating aerobic digesters?

Select one or more of the following:

  • Floating sludge

  • Fluctuating BODs

  • Odors

  • Scum

  • Wet solids

Explanation

Question 93 of 131

1

When reviewing the specifications for sludge digestion and solids handling facilities, which items should operators check?

Select one or more of the following:

  • Adequate supply of equipment operation and maintenance manuals

  • Equipment warranties and responsibility for acceptance testing

  • Instrumentation—remote and local control board items and recorders are provided

  • Paints and protective coatings

  • Performance requirements and capabilities

Explanation

Question 94 of 131

1

Prior to discharge to surface waters, why must wastewater be treated?

Select one or more of the following:

  • To prevent nuisances due to odors or unsightliness

  • To prevent the wastewater from interfering with the many uses of surface waters

  • To produce documentation for the record keeping system

  • To protect the health of the people who may come in contact with it

  • To provide water for discharge sampling and analysis

Explanation

Question 95 of 131

1

Which operating procedures should be developed for the start-up of a plant?

Select one or more of the following:

  • Inspect the discharge line, where possible

  • Look at the water surface over the diffuser or outfall pipe

  • Observe the flow entering the discharge system for visible pollutants

  • Open all appropriate valves

  • Start the pumps (unless it is a gravity system)

Explanation

Question 96 of 131

1

Which items are probable causes of floatables in pond effluents?

Select one or more of the following:

  • Excessive floatables and scum on the surface

  • Excessive solids accumulated on the bottom have gasified and floated to the surface

  • Excessive velocity or insufficient detention time

  • Outlet baffle is not at the proper location

  • Temperature or weather conditions may favor a particular species of algae

Explanation

Question 97 of 131

1

Under what conditions may the frequency of sampling be increased?

Select one or more of the following:

  • When the lab is not meeting QA/QC requirements

  • When the lab staff have the opportunity to analyze more samples

  • When the receiving waters are not meeting established water quality standards

  • When the treatment plant effluent is not meeting discharge requirements

  • When the treatment plant staff increases and more time is available to collect more samples

Explanation

Question 98 of 131

1

A confined space may be defined as any space that meets Which conditions?

Select one or more of the following:

  • Allows more than one employee to fit into the space and work

  • Has limited or restricted means for entry or exit

  • Is large enough and so configured that an employee can bodily enter and perform assigned work

  • Is not designed for continuous employee occupancy

  • Requires employees to wear personal protective equipment (PPE)

Explanation

Question 99 of 131

1

The hazard warnings on containers of hazardous chemicals at your plant should contain emergency guide information on which specific categories?

Select one or more of the following:

  • Flammability

  • Health

  • Nutrients

  • Permeability

  • Reactivity

Explanation

Question 100 of 131

1

Which items could be included in your plant's fire prevention plan?

Select one or more of the following:

  • Develop written response procedures for reacting to a fire situation, to include evacuation

  • Provide periodic cleanup of weeds or other vegetation in and around the plant

  • Provide required service on all fire detection and response equipment (inspection, service, hydrostatic

  • Regulate the use, storage, and disposal of all combustible materials/substances

  • Routinely inspect fire doors to ensure proper operation and unobstructed access

Explanation

Question 101 of 131

1

The primary use for polymers in wastewater treatment is the conditioning of sludge to facilitate removal of water in
which subsequent treatment processes?

Select one or more of the following:

  • Aerobic digesters

  • Belt filter presses

  • Centrifuges

  • Dissolved air flotation thickeners

  • Gravity belt thickeners

Explanation

Question 102 of 131

1

Working safely in the laboratory involves which basic safety procedures and practices?

Select one or more of the following:

  • Always check labels on bottles to make sure that the proper chemical is selected

  • Never handle chemicals with your bare hands

  • Never use laboratory glassware for a cup or food dish

  • Use care in making rubber-to-glass connections

  • Use proper safety goggles or a face shield in all tests where there is danger to the eyes

Explanation

Question 103 of 131

1

Which paperwork items can be helpful in identifying the causes of accidents and developing corrective procedures?

Select one or more of the following:

  • Accident report forms

  • Facility plans and specifications and plant inspection reports

  • Plant's safety policy

  • Plant's safety rules

  • Supervisors' guidelines on how to promote and implement a safety plan

Explanation

Question 104 of 131

1

What could cause a pump to run dry?

Select one or more of the following:

  • Excessive leakage when pumping against a high head

  • Holes (spacing) being too large in the suction intake screen

  • Impeller rotating too fast and causing cavitation

  • Lack of proper priming when starting

  • Loss of suction when operating

Explanation

Question 105 of 131

1

Which items are primary sources of unsatisfactory AC brush and ring performance?

Select one or more of the following:

  • Disturbing external condition

  • Improper load or service condition

  • Mechanical fault in the machine

  • Poor machine design

  • Poor preparation and care of the machine

Explanation

Question 106 of 131

1

When performing pump station electrical equipment maintenance tasks, which items should be checked and inspected annually?

Select one or more of the following:

  • All panel instruments

  • All switch gear and distribution equipment

  • Enclosures

  • Fuses and circuit breakers

  • Wiring integrity

Explanation

Question 107 of 131

1

Which items are causes of motor malfunction or failure?

Select one or more of the following:

  • Bearing failures

  • Contaminants

  • Old age

  • Overload (thermal)

  • Single phasing

Explanation

Question 108 of 131

1

When troubleshooting any motor control that has developed trouble, the qualified maintenance operator should be able to do which of the following?

Select one or more of the following:

  • Examine all unusual factors

  • Find the cause of the problem

  • Know what should happen when a switch is pushed

  • Make a visual inspection

  • Repair the problem and eliminate the cause, if possible

Explanation

Question 109 of 131

1

Plugged pipelines are encountered in lines transporting which types of materials and liquids?

Select one or more of the following:

  • Digested sludge

  • Effluent

  • Grit

  • Raw sludge

  • Scum

Explanation

Question 110 of 131

1

Which factors will cause sludge lines to plug more often?

Select one or more of the following:

  • When industrial wastes are discharged after a fine screening process

  • When plant effluent and reclaimed effluent are pumped through the lines

  • When RAS (return activated sludge) and WAS (waste activated sludge) are pumped through the lines

  • When scum and raw sludge are pumped through the same line

  • When stormwaters carry in grit and silt that are not effectively removed by the grit removal facilities

Explanation

Question 111 of 131

1

When examining lift station prints, operators should ensure adequate provisions have been made for which items?

Select one or more of the following:

  • Floors should be sloped to provide drainage, where needed, and drains should be located in low spots

  • Overhead clearances of power lines, trees, and roofs should be adequate for a crane to remove large equipment

  • The alarm system should signal high water levels in the wet well and water on the floor of the dry well

  • There should be room to use hydrolifts, cranes, and high-velocity cleaners, as needed

  • There should be sufficient room to set up portable pumping units or other necessary equipment in cases of major station failures or disasters

Explanation

Question 112 of 131

1

When working with chemicals and other materials in the wastewater treatment plant laboratory, which hazards can
be minimized by using proper techniques and equipment?

Select one or more of the following:

  • Burns

  • Electric shock

  • Infectious materials

  • Poisons

  • Toxic fumes

Explanation

Question 113 of 131

1

Why must hydrogen sulfide gas be measured in the atmosphere?

Select one or more of the following:

  • Because it causes corrosion

  • Because it causes odors

  • Because it increases the fuel value of sewer gas

  • Because it is flammable and explosive under certain conditions

  • Because it is toxic to your respiratory system

Explanation

Question 114 of 131

1

Which precautions should be considered when measuring the chemical oxygen demand (COD) of a sample?

Select one or more of the following:

  • Flasks and condensers should be clean and free from grease or other oxidizable materials

  • The standard ferrous ammonium sulfate solution is unstable and should be standardized daily

  • The wastewater sample should be well mixed

  • Use a wide-tip pipet to ensure a representative sample is added

  • Use extreme caution and safety precautions when handling the chemicals used for the test

Explanation

Question 115 of 131

1

Which precautions should be considered when using a dissolved oxygen (DO) probe?

Select one or more of the following:

  • Dissolved inorganic salts, such as found in seawater, can influence the readings from a probe

  • Do 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

  • Keep the membrane in the tip of the probe from drying out

  • Periodically check the calibration of the probe

  • Reactive compounds, such as reactive gases and sulfur compounds, can interfere with the output of a probe

Explanation

Question 116 of 131

1

Sulfate ions in wastewater are indirectly responsible for which serious problems?

Select one or more of the following:

  • Indigestion

  • Laxative effects

  • Odor

  • Sewer corrosion problems

  • Toxic gas

Explanation

Question 117 of 131

1

Which items are general types of computer applications in wastewater treatment plants??

Select one or more of the following:

  • Communications

  • Data analysis

  • Recordkeeping

  • Report generation

  • Systems monitoring

Explanation

Question 118 of 131

1

If the proper lab results are entered into the computer, the computer can calculate and print out which items?

Select one or more of the following:

  • Chemical dosages

  • F/Ms (Food to Microorganism ratios)

  • MCRTs (Mean Cell Residence Times)

  • Percent removals

  • Suspended solids, BOD, or COD loadings

Explanation

Question 119 of 131

1

Which programs are typically included in general purpose software packages?

Select one or more of the following:

  • Database management

  • Graphics

  • Plant template

  • Spreadsheet

  • Word processing

Explanation

Question 120 of 131

1

Which items can typically be monitored, recorded, and controlled by computers in a wastewater treatment plant?

Select one or more of the following:

  • Aeration basin dissolved oxygen

  • Anaerobic sludge digester gas production

  • Chlorine contact time

  • Influent flow control gates and valves

  • Secondary clarifier sludge pumping

Explanation

Question 121 of 131

1

When preparing to plot data in a bar graph, what information must first be determined?

Select one or more of the following:

  • Class midpoint

  • Distribution of data

  • Measurement frequencies

  • Spread of data

  • Width of the class interval

Explanation

Question 122 of 131

1

Why are records important?

Select one or more of the following:

  • They are needed to fill unused space in storage rooms and filing cabinets

  • They are needed to show the type and frequency of maintenance and to evaluate the effectiveness of maintenance programs

  • They can indicate plant efficiency, performance, past problems, and potential problems

  • They can provide data upon which to base recommendations for modifying plant operation and facilities

  • They may be needed in damage suits brought against the district or municipality

Explanation

Question 123 of 131

1

A list of the minimum daily records kept at a fairly large treatment plant with digester tanks may include which items?

Select one or more of the following:

  • Chlorine use (lbs or kg)

  • Influent and effluent temperatures

  • pH of influent and effluent

  • Precipitation and air temperature

  • Raw wastewater flow (MGD from totalizer)

Explanation

Question 124 of 131

1

Which items are basic principles common to good report writing?

Select one or more of the following:

  • Know the purpose and objective of your report

  • Know your subject

  • Omit any recommendations

  • Organize the report to present your ideas in a logical order

  • Tailor your report to the person or persons to whom it is directed

Explanation

Question 125 of 131

1

Which items are guidelines for preparing a report?

Select one or more of the following:

  • Arrange the ideas in a logical sequence

  • Begin writing

  • Gather material needed to support the ideas to be presented in the report

  • List ideas and topics you plan to cover in the report

  • Prepare conclusions and recommendations after writing the main body of the report

Explanation

Question 126 of 131

1

The utility manager's staffing responsibilities include which tasks?

Select one or more of the following:

  • Evaluating employee performance

  • Issuing orders and instructions

  • Providing opportunities for advancement for operators and staff

  • Selecting and training employees

  • Teaching classes

Explanation

Question 127 of 131

1

Which items are important steps in the process of hiring and selecting a new operator?

Select one or more of the following:

  • Advertising the position

  • Avoiding unacceptable pre-employment inquiries

  • Interviewing applicants

  • Paper screening

  • Selecting the most qualified candidate

Explanation

Question 128 of 131

1

Which items may serve as a guide for both the employee and the supervisor when dealing with a confrontation regarding employee performance issues?

Select one or more of the following:

  • Aim for a permanent solution

  • Create a private environment

  • Keep your language appropriate

  • Listen very carefully

  • Maintain an adult approach

Explanation

Question 129 of 131

1

The total revenue of a utility comes from revenue generated by which sources?

Select one or more of the following:

  • Chemicals

  • Hook-up charges

  • Interest income

  • Taxes or assessments

  • User fees

Explanation

Question 130 of 131

1

What is predictive maintenance?

Select one or more of the following:

  • A method of establishing baseline performance data

  • Monitoring performance criteria over a period of time

  • Observing changes in performance so that failure can be predicted and maintenance can be performed on a planned, scheduled basis

  • The same as corrective maintenance

  • The same as proactive maintenance

Explanation

Question 131 of 131

1

How can a supervisor be partially or fully responsible for an accident?

Select one or more of the following:

  • By causing unsafe acts to take place

  • By disregarding an unsafe work environment

  • By overlooking or failing to consider any number of safety hazards

  • By requiring operators to follow safe procedures

  • By requiring work to be performed in haste

Explanation

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