Wastewater Collection 2

Front 1

Area subject to higher than normal vandalism are usually

A) Along heavily traveled streets. B) Secluded, out-of-the-way buildings. C) Well-lighted, visible areas. D) None of the above.

Back 1

. B) Secluded, out-of-the-way buildings.

Front 2

How does an emergency service crew try to remove a stoppage? A) Balling. B) Flushing. C) Hand rods. D) Parachutes.

Back 2

C) Hand rods.

Front 3

The amount of oxygen that may become dissolved in a given amount of water is most related to

A) Hardness. B) Total Dissolved Solids C) Temperature. D) Turbidity.

Back 3

C) Temperature

Front 4

The gas most commonly associated with septic wastewater is A) Carbon dioxide. B) Carbon monoxide. C) Hydrogen sulfide. D) Methane.

Back 4

B) Carbon monoxide.

Front 5

What determines the amount of hydrogen sulfide produced in a sewer?

A) BOD concentration. B) DO concentration. C) pH D) SS concentration.

Back 5

C) pH

Front 6

Four conditions are necessary to create an explosion. Three of these conditions are: combustible gas, adequate oxygen and sufficient heat. What is the fourth?

A) Constant supply of combustible gas. B) Enclosed area that will hold the gases. C) Proper mixing of gas and oxygen. D) None of the above.

Back 6

C) Proper mixing of gas and oxygen.

Front 7

The lack of an unpleasant odor in a manhole, lift station or other structures does not always mean that no dangerous gases are present because A) Some dangerous gases have no odor. B) Oxygen may still be lacking. C) Some gases deaden the sense of smell D) All of the above.

Back 7

D) All of the above.

Front 8

As the impeller wears on a pump, the pump efficiency will A) Decrease. B) Improve. C) Increase. D) Not change.

Back 8

A) Decrease

Front 9

How closely an instrument measures the actual value of the process variable being measured is called its A) Accuracy. B) Calibration. C) Precision. D) Standardization.

Back 9

A) Accuracy.

Front 10

Items that must be examined when inspecting manholes include A) Corrosion. B) Cracks. C) Elevation of lid. D) All of the above.

Back 10

D) All of the above.

Front 11

Vibrations in pumps may be caused by improper motor-pump A) Alignment. B) Curves. C) Piping. D) Power factor.

Back 11

A) Alignment

Front 12

Advantages of a video tape recording system include

A) Ability to see what's happening when camera is under water. B) Cheaper than a Polaroid camera. C) Length and severity of defective areas can be recorded. D) Visitors are impressed.

Back 12

C) Length and severity of defective areas can be recorded.

Front 13

The most widely used type of prime mover in a pumping plant is

A) Diesel engine. The most widely used type of prime mover in a pumping plant is A) Diesel engine. B) Electric motor. C) Gas engine. D) Steam engine. C) Gas engine. D) Steam engine.

Back 13

B) Electric motor

Front 14

"Schedule 40" refers to A) Flow capacity. B) Friction loss. C) Tubing strength. D) Wall thickness.

Back 14

D) Wall thickness.

Front 15

Hazards that my damage a TV camera going through a sewer include A) Deep water that submerges the camera B) Fogging of optical lens. C) Offset joints. D) All of the above.

Back 15

D) All of the above

Front 16

Centrifugal pump parts include A) Diaphragm. B) Piston. C) Rotor. D) Volute.

Back 16

D) Volute.

Front 17

T118) When packing a centrifugal pump, the packing gland should be tightened

A) Slowly over a period of several hours. B) To 20 foot pounds. C) With wrench and then backed off 1/4 turn. D) None of the above.

Back 17

A) Slowly over a period of several hours.

Front 18

What factors should be considered when providing trench shoring?

A) Grade of sewer. B) Pipe material. C) Structures or sources of vibration near trenches. D) All of the above.

Back 18

C) Structures or sources of vibration near trenches.

Front 19

Construction defects that cause problems in wastewater collection systems include A) Improper grade of sewers. B) Improper taps. C) Structure failure of manholes. D) All of the above.

Back 19

D) All of the above.

Front 20

A venturi meter measures quantity of fluid by

A) Difference in pressure between a constricted and a full-size portion. B) Electronic measurement. C) Velocity of the fluid past a given point. D) Weight of the fluid.

Back 20

Difference in pressure between a constricted and a full-size portion.

Front 21

T122) How can the members of a bailing crew communicate with each other? A) Hand signals. B) Shouting down the sewer. C) Telegraph. D) Writing.

Back 21

A) Hand signals.

Front 22

Which of the following is the most common factor leading to the generation of hydrogen sulfide in sewers?

A) Anaerobic conditions. B) Constantly high velocity of flow in sewers. C) Low concentrations of ferrous sulfide. D) Presence of highly soluble fats and oils.

Back 22

A) Anaerobic conditions

Front 23

When sewer line grades are too flat, an odor problem is likely to result. The most likely cause of the odor problem is decreased velocity which

A) Allows decomposible solids to settle. B) Decreases the treatment time in the lines. C) Increases the treatment time of inorganic solids. D) None of the above.

Back 23

A) Allows decomposible solids to settle

Front 24

After a collection system problem has been solved, you should

A) Wait until tomorrow to fill out the report forms. B) Take a break. C) Go home. D) Evaluate the effectiveness of the results.

Back 24

D) Evaluate the effectiveness of the results.

Front 25

Why must you always know where a cleaning tool is in a sewer?

A) So the tool can find its way back. B) So you can locate it when resuming work after and interruption. C) So you know where obstructions or difficulties are encountered. D) None of the above.

Back 25

) So you know where obstructions or difficulties are encountered.

Front 26

Improper connections can be detected through A) DO tests. B) Soundings. C) TV inspection. D) All of the above.

Back 26

C) TV inspection.

Front 27

When curing a concrete slab, which of the following tools is used to compact the concrete and bring a cement film to the surface for finishing?

A) Grasshopper. B) Tamper. C) Trowel. D) Vibrator.

Back 27

D) Vibrator.

Front 28

Emergency stoppages in pipelines may be cleared safely by use of

A) Hand rods. B) High velocity cleaners. C) Power rodders. D) All of the above.

Back 28

D) All of the above.

Front 29

Mark the correct equation for determining the amount of chlorine required for a dosage of 10 mg/L in 500,000 gallons of flow.

A) 0.05 x 7.34 x 10 = 1b C12 B) 0.05 x 8.34 x 10 = 1b C12 C) 0.5 x 7.34 x 10 = 1b C12 D) 0.5 x 8.34 x 10 = 1b C12

Back 29

D) 0.5 x 8.34 x 10 = 1b C12

Front 30

Your chlorinator room should have an exhaust vent installed A) Near the ceiling. B) Near the floor. C) Halfway up the wall. D) At the chlorinator bell jar.

Back 30

B) Near the floor.

Front 31

Rodents and insects can be controlled by

A) Aeration. B) Spraying manholes with an approved pesticide. C) Vacuum filtration. D) All of the above.

Back 31

B) Spraying manholes with an approved pesticide

Front 32

What is a mechanical means to remove material from a sewer?

A) Brushing. B) Pumping. C) Scraping. D) Sweeping.

Back 32

C) Scraping.

Front 33

Hydrogen peroxide controls odors by

A) Decreasing the DO. B) Neutralizing pH. C) Oxidizing sulfide components. D) Providing a source of hydrogen ions.

Back 33

C) Oxidizing sulfide components

Front 34

T135) Which of these pH readings indicates an acidic wastewater? A) 3 B) 7 C) 9 D) 12

Back 34

A) 3

Front 35

The record log of a hydraulic cleaning operation should include

A) Type and amount of material removed from downstream manhole. B) Feet of rod used. C) Camera malfunctions. D) All of the above.

Back 35

A) Type and amount of material removed from downstream manhole

Front 36

What type of pump is not seriously damaged if the discharge valve is closed for a short time while the pump s running? A) Centrifugal pump. B) Diaphragm pump. C) Piston pump. D) Plunger pump.

Back 36

A) Centrifugal pump.

Front 37

Yokes, rollers, jacks, swivels, pull in machine and loader are accessories used in

A) Catch basin cleaning. B) Jet rodding. C) Power-bucket machine cleaning. D) Power rodding.

Back 37

C) Power-bucket machine cleaning.

Front 38

Sources of excessive clear water in a collection system include

A) A problem at the wastewater treatment plant. B) A water distribution main construction project. C) Evaporation. D) Infiltration from a high water table.

Back 38

D) Infiltration from a high water table.

Front 39

What should be your most important concern after a chemical spill? A) Aquatic life. B) Clean-up procedures. C) Health-related effects D) Odors.

Back 39

) Health-related effects

Front 40

A sewer-use ordinance should specify the personnel performing

A) Cleaning of the main lines. B) Monitoring. C) Repairing of broken pipes. D) Sealing of leaky joints.

Back 40

B) Monitoring.

Front 41

What factor must be considered when obtaining an easement for construction and maintenance of a collection system?

A) Compaction. B) Deposition of out materials. C) Revegatation costs. D) Manhole headroom.

Back 41

B) Deposition of out materials.

Front 42

Sewers which are located adjacent to a ground storage reservoir are required to be located at least 10 feet from the structure and be constructed of water main-type materials for a distance of at least 50 feet from the storage reservoir. What is the reason for this requirement?

A) Prevent a high ground water table adjacent to the reservoir. B) Protect the storage reservoir from contamination. C) Reduce infiltration into the sewer. D) Vitrified-clay sewer pipe is easily broken.

Back 42

B) Protect the storage reservoir from contamination.

Front 43

T144) Sewer maps should be kept up-to-date for several reasons. Which of the following is the least appropriate reason?

A) So a TV inspection program can be planned and scheduled effectively. B) So that census canvassers can determine data on standards of living. C) So that new house services can be connected with minimum difficulty. D) To permit development of better plans and specifications for street improvement projects.

Back 43

B) So that census canvassers can determine data on standards of living.

Front 44

The temperature versus DO relationship for wastewater is such A) Higher the temperature, the higher the DO saturation level. B) Higher the temperature, the lower the DO saturation level. C) Lower the temperature, the lower the DO saturation level. D) None of the above.

Back 44

B) Higher the temperature, the lower the DO saturation level.

Front 45

The gas most commonly associated with fresh wastewater is A) Carbon dioxide. B) Carbon monoxide. C) Hydrogen sulfide. D) Oxygen.

Back 45

D) Oxygen.

Front 46

Sources of harmful radioactive isotopes in wastewater collection systems include

A) Hospitals. B) Research labs. C) Tracer studies. D) All of the above.

Back 46

D) All of the above.

Front 47

"Hz" stands for A) Cycles per second. B) Hand control. C) Horizontal phase. D) Polyphase.

Back 47

A)Cycles per second

Front 48

When a fire hydrant is operated, it should be A) Just opened enough to have a flow. B) Opened fully. C) Opened halfway. D) Regulated to flow required.

Back 48

B)Opened fully

Front 49

Results obtained from pipe roughness coefficient tests can indicate whether or not A) Contamination is entering the pipe. B) The ability of the pipe to transmit flow is being hindered. C) The quality of the wastewater in the pipe is deteriorating. D) The size and number of leaks are increasing.

Back 49

B)

The ability of the pipe to transmit flow is

being hindered

Front 50

Anaerobic wastewater is frequently corrosive to materials it contacts, especially A) Coal tar enamel. B) Concrete. C) Copper. D) Plastic.

Back 50

B)Concrete.

Front 51

The electrical disconnect for a pumping station motor can trip out under which one(s) of the following possibilities? A) Clogged pump inlet. B) Low temperature. C) Strike by lightning. D) Worn packing.

Back 51

C)Strike by lightning.

Front 52

One of the electric motors in the facility has overheated and caught fire. Select the correct sequence of steps you would take. 1 extinguish fire 2 test 3 repair 4 shut off power 5 remove tags and locks 6 ascertain cause 7 tag and lock out power

Back 52

C) 4, 1, 7, 6, 3, 5, 2

Front 53

How can a closed circuit television unit with video tape help to evaluate the condition of a wastewater collection system? A) Chemicals can be applied for root control. B.) Effectiveness of cleaning techniques can be studied under various conditions in collection system. C) Service lines to homes can be inspected D) TV camera can remove stoppages.

Back 53

B.)Effectiveness of cleaning techniques can be studied under various conditions in collection system

Front 54

Pipe materials that are the least susceptible to corrosion by acids formed from gases generated in sewers are A) ACP B) CIP C) RCP D) VCP

Back 54

D)VCP

Front 55

A chlorine gas mask should be provided A) Just outside the chlorine room door. B) Just inside the chlorine room door. C) In the plant superintendent's office. D) In a locked tamper-proof container.

Back 55

A)Just outside the chlorine room door

Front 56

Chlorine cylinders should be stored A) Below ground level. B) In a clean, dry location. C) On their side. D) With the protective caps off.

Back 56

B)In a clean, dry location.

Front 57

Waste flowing at 15 percent of design flow through a 60-inch interceptor may allow A) photosynthesis to take place in the collection system. B) Combined sewers to relieve the waste load. C) The waste to scour the collection system. D) The waste to turn septic.

Back 57

D) The waste to turn septic.

Front 58

At a pumping station equipped with centrifugal pumps, what caused the discharge pressure to suddenly increase and the discharge quantity to suddenly decrease? A) A discharge valve was closed. B) A suction valve was closed. C) The pump amperage was decreased. D) The voltage was suddenly increased.

Back 58

A)A discharge valve was closed

Front 59

To reduce infiltration into the existing wastewater collection system, you should A) Enforce ordinances that require roof drains to be discharged to street gutters or storm drains. B) Insert plastic liners into sewer pipes. C) Replace multi-holed manhole covers with no-hole covers. D) Use higher pressures in force mains.

Back 59

B)Insert plastic liners into sewer pipes

Front 60

Which chemical may be used for odor control in a septic sewer system? A) Calcium chloride. B) Hydrogen peroxide. C) Oxidized aluminum. D) Sodium chloride.

Back 60

B)Hydrogen peroxide.

Front 61

Liners are installed in sewers to correct problems caused by A) Grade alignment. B) Grease. C) Grit. D) Infiltration.

Back 61

D)Infiltration.

Front 62

To sample for pH, you should collect a A) Composite sample. B) Continuous sample. C) Grab sample D) Regulated sample.

Back 62

)Grab sample

Front 63

You have been directed to examine and review the plans and specifications for a new wastewater pump station prior to the advertising or construction bids. Which of the following is of least significance to your review? A) The clearance around and above pumps, motors, valves and control switch gear. B) The provisions for ingress and egress for both wet well and dry well. C) The size and geometry of the wet well D) The specific colors for all piping.

Back 63

)The specific colors for all piping

Front 64

Which one(s) of the following items should be inspected when responding to a lift station alarm at night? A) Dry well. B) motor control center and power panel. C) Operation of ventilation equipment. D) All of the above.

Back 64

D)All of the above

Front 65

What affects the flow capacity of an installed sewer line? A) Backfill material, manhole spacing, pipe size. B) Burial depth, size, manhole spacing. C) Pipe material, invert elevation, pipe size. D) Pipe size, pipe material, grade.

Back 65

D)Pipe size, pipe material, grade

Front 66

When litmus paper is immersed in an acid solution, the paper turns A) Blue B) Red C) Violet. D) Yellow.

Back 66

B)Red

Front 67

What is the greatest distance at which manholes should be installed for an 8-inch sewer line? A) 100 feet. B) 200 feet. C) 300 feet. D) 400 feet.

Back 67

C)300 feet.

Front 68

Which of the following types of information should be recorded during TV inspection of a sewer? A) Amount of material removed in cubic feet. B) Distance from manhole to recorded observations. C) Volume of water used. D) All of the above.

Back 68

B)Distance from manhole to recorded observations.

Front 69

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 confusing in the event of a disaster. D) None of the above.

Back 69

C)Useful in reducing confusing in the event of a disaster

Front 70

The best discipline is A) Authoritarian. B) General supervisory. C) Self-discipline. D) Theocratic.

Back 70

C)Self-discipline

Front 71

Duties assigned to an industrial waste section include A) Attempting to locate and/or identify sources of wastes that upset water treatment plants. B) Collecting data and making recommendations regarding industries that violate sewer-use ordinances. C) Inspecting discharges into collection system. D) All of the above.

Back 71

D)All of the above.

Front 72

Staffing a new system should be viewed primarily as the function of A) Every operator. B) Personnel department. C) They employee. D) The supervisory management.

Back 72

D)The supervisory management

Front 73

Organization charts are helpful to show A) How the collection system is organized. B) How to locate sewers C) The structure of an agency D) The way to select solutions to problems.

Back 73

C)The structure of an agency

Front 74

Decentralization of organization refers to A) Nominating new supervisors B) Looking at all positions, and possibly redelegating authority. C) Firing all employees and hiring new ones. D) Eliminating some departments.

Back 74

B)Looking at all positions, and possibly redelegating

Front 75

Which one of the following would not be considered a natural event? A) Explosion. B) Flood. C) Lightning. D) Tornado.

Back 75

A)Explosion.

Front 76

A worker notices that a necessary piece of equipment is defective. The currant job needs to be finished as soon as possible. The worker should A) Consult with the other employees and reach a consensus agreement on what to do. B) Continue the job but be cautious while using the defective equipment. C) Report the defect but hold off completing the job until the equipment is repaired of replaced. D) Stop all work and wait for the boss to come by the job site and make a decision.

Back 76

C)Report the defect but hold off completing the job until the equipment is repaired of replaced.

Front 77

The essence of control is A) Written records. B) Testing. C) Evaluation. D) Action.

Back 77

)Evaluation.

Front 78

While evaluating an applicant for employment, which of the following may enter into your decision? A) Age. B) Education level. C) Minority classification. D) All of the above.

Back 78

B)Education level.

Front 79

Public relations are important because we A) Like our jobs. B) Need lots of training. C) Want to finish our work in a hurry D) Work for the public.

Back 79

D)Work for the public.

Front 80

The best way to record all work done is through A) closed circuit TV. B) Polaroid system. C) Tape recorder. D) Work order system.

Back 80

D)Work order system.

Front 81

The most important function of record-keeping is A) They record how much money was budgeted and how much we spent. B) They record the past and provide a sound basis on which to plan the future. C) The record what was done and when it was done. D) They record where we've been and how we got where we are today.

Back 81

B)They record the past and provide a sound basis on which to plan the future

Front 82

The presence of hydrogen sulfide in a collection system is usually caused by the A) Bacterial oxidation of sulfur in the presence of dissolved oxygen. B) Bacterial reduction of methane in the absence of dissolved oxygen. C) Bacterial reduction of methane in the presence of dissolved oxygen. D) Bacterial reduction of sulfate compounds in the absence of dissolved oxygen.

Back 82

D)Bacterial reduction of sulfate compounds in the absence of dissolved oxygen.

Front 83

Which of the following rules apply to the operation of gas or electric welding equipment? A) Adequate fire protection must be provided. B) Operators must be thoroughly trained. C) Protection of other personnel must be provided and used. D) All of the above.

Back 83

D)All of the above.

Front 84

Upon investigating a complaint of bad odors around a catch basin, you find that the trap and water level appear to be in good order. The proper next step is to A) Add 7.5 to 10 lbs of quicklime to the basin daily until the odor diminishes. B) Ask residents to stay away from the catch basin area. C) Flush the basin with fresh water. D) Rod and then ball the connection from the catch basin to the sewer.

Back 84

C)Flush the basin with fresh water

Front 85

Which of the following is not typical of a "submersible" pump? A) Can be installed in a crooked hole. B) Minimizes vandalism. C) Quieter operation. D) Requires water lubrication.

Back 85

D)Requires water lubrication

Front 86

Possible types of atmospheric hazards found in manholes include A) Explosion. B) Oxygen deficiency. C) Toxic gas. D) All of the above.

Back 86

D)All of the above