Wastewater Collections 1

Front 1

T1) The formula for calculating the volume of a rectangular wet well is

Back 1

C) V=WxLxH

Front 2

T2) You should never attempt to install, troubleshoot, maintain or replace electrical equipment panels, controls, wiring, or circuits unless

Back 2

D) You know what you are doing, are qualified, and are authorized

Front 3

Which of the following is not considered a confined space?

A) Manhole B) Anaerobic digester C) Lift station wet well D) Operator control room

Back 3

D)Operator control room

Front 4

T4) A pump is delivering less than the expected rate of discharge. What can cause this to happen?

A) Discharge head too low B) Discharge head too high C) Check valve open D) Pump is primed

Back 4

Right x B) Discharge head too high

Front 5

T5) Wearing rings are installed in a pump to

Back 5

A) Concentrate wear on an economically replaceable pan

Front 6

T6) A lantern ring is a

Back 6

C) Spacer ring in a pump packing gland to improve seat water distribution

Front 7

T7) Check valves are used on the discharge side of centrifugal pumps to

Back 7

C) Prevent water in discharge line from flowing back

Front 8

T8) What information must be on a warning tag attached to a switch that has been locked out?

Back 8

C) Signature of person who locked out the switch, who is the only person authorized to remove tag

Front 9

Enclosed, open, and semi-closed are terms used for the designation and selection of

Back 9

A) Impellers

Front 10

T10) Leakage of seal water around the packing on a centrifugal pump is required because it acts as a(n)

Back 10

Lubricant

Front 11

Hydrogen sulfide is a toxic gas that smells like ____. At high concentrations of hydrogen sulfide, however, the sense of smell is deadened and no odor is detected.

A) Dead fish B) Fuel gas C) Rotten cabbage D) Rotten eggs

Back 11

Rotten Eggs

Front 12

T12) Why are gasoline and volatile solvents objectionable where present in a sewer?

A) They produce an explosion hazard B) They tend to cause the solids to vaporize C) They will coagulate floatables and cause stoppages D) They represent wasted recourses

Back 12

A) They produce an explosion hazard

Front 13

T13) Biological activity in long, sluggish-flow, flat-grade sewer lines will likely

A) Decrease line sediment B) Create oxygen deficiency in the air in manholes, sewers, or wet wells C) Stop toxic gas production D) Increase the “carrying capacity” of the line

Back 13

B) Create oxygen deficiency in the air in manholes, sewers, or wet wells

Front 14

T14) Task least likely to be preformed by collection systems personnel is

A) Cleaning sewer stoppages B) Making water connections C) Inspecting/testing manholes D) Maintaining collection systems equipment

Back 14

B) Making water connections

Front 15

A pH of 6.0 is A) Acid B) Alkaline C) Neutral D) Basic

Back 15

A) Acid

Front 16

T16) Biological hazards in collection system operations include

A) Noxious or toxic gases or vapors B) Oxygen deficiency C) Physical injuries D) Hepatitis A

Back 16

D) Hepatitis A

Front 17

A pH of 7.0 is A) Acid B) Alkaline C) Neutral D) Basic

Back 17

C) Neutral

Front 18

T18) What must be checked before entering a manhole?

A) Atmosphere in manhole B) Safety equipment C) Proper barricades or warning devices around a manhole D) All of the above

Back 18

D) All of the above

Front 19

T19) In sewer maintenance, what is a pig?

A) A bullet shaped object passed through a force main B) A power rod C) Any foul smelling equipment D) The hydraulic rodding truck

Back 19

A) A bullet shaped object passed through a force main

Front 20

T20) The purpose pf ribs on the outside of a Wayne Sewer Ball is to

Back 20

C) Cause jet action to aid in the hydraulic flushing of the sewer line

Front 21

T21) Mechanical ventilation of a lift station is required to

Back 21

x A) Ensure safe working access

Front 22

T22) When opening a power rodder properly, do the following

A) Push the rodding tool into an obstruction and hold it there B) Rotate rod in one position C) Make sure all the torque is out of a broken rod D) Rod past dropped joints or through a crushed pipe

Back 22

C) Make sure all the torque is out of a broken rod

Front 23

T23) You should get out of the manhole as soon as

A) Lower explosive level alarm activates B) H2S exceeds 5 ppm C) Flow increases slightly D) None of the above

Back 23

A) Lower explosive level alarm activates

Front 24

T24) A common name appurtenance used to keep an accidental flow of wastewater from entering a building is called

A) Barrel B) Cleanout C) Backwater valve D) Catch basin

Back 24

C) Backwater valve

Front 25

T25) Which of the following is a type of shore? A) Bar B) Aluminum hydraulic C) Truss D) Sand

Back 25

B) Aluminum hydraulic

Front 26

T26) The most important traffic safety consideration is the

A) Time of day B) Size of the job C) Wearing of hard hats and safety vests D) Location of the job

Back 26

Wearing of hard hats and safety vests

Front 27

T27) Which of the following first aid actions would you perform first if an operator inhales chlorine gas?

A) Immediately remove victim from the contaminated area B) Immediately calla physician or paramedic C) Immediately begin appropriate treatment D) Do nothing because chlorine gas is nontoxic

Back 27

B) Immediately calla physician or paramedic

Front 28

T28) Which of these chemicals may be used for odor control in sewers?

A) Chlorine B) Muriatic acid C) Potassium chloride D) Sodium chloride

Back 28

A) Chlorine

Front 29

T29) Sources of excessively clear water in a collection system include

A) A problem at the wastewater treatment plant B) A sanitary sewer leak C) Exfiltration from a high water table D) Infiltration from a high water table

Back 29

D) Infiltration from a high water table

Front 30

T30) What information would you consider while clearing a stoppage in a sewer?

A) Nothing-start adding pressurized water to clear the stoppage B) Cause of stoppage C) Time of day D) Staffing requirements kv

Back 30

B) Cause of stoppage

Front 31

T31) With the completion of a sewer cleaning job, which one of the following must be done at the manhole?

A) Complete and sign timesheets B) Wash down the truck C) Wash down street around work area, making sure the wash water is broomed into the M.H. D) None of the above

Back 31

) Wash down street around work area, making sure the wash water is broomed into the M.H.

Front 32

T32) Lift station failures include ________ failure. A) dip tube B) electrical system C) inverted siphon D) All of the above

Back 32

B) electrical system

Front 33

T33) A kilowatt (KW) is equivalent to

A) .67 amperes at a voltage of 120 B) 746 watts C) 1.34 horsepower D) 1,000 megacycles

Back 33

C) 1.34 horsepower

Front 34

T34) Infiltration my result from

A) Bad joints B) Improper closed circuit television operation C) Poor ventilation D) Direct downspout and drain connections

Back 34

A) Bad joints

Front 35

T35) Grease in sewers is mechanically removed by A) High-pressure jets B) Sawing C) Not usually a problem in sewers D) Power rodders

Back 35

A) High-pressure jets

Front 36

T36) The most important reason for washing hands thoroughly after taking a wastewater sample is to

A) Avoid being infected by pathogenic bacteria B) Avoid contaminating BOD bottles C) Avoid smudging BOD bottles D) Avoid accidentally dropping any glassware

Back 36

A) Avoid being infected by pathogenic bacteria

Front 37

T37) Roots can enter collection systems through A) Air gaps B) Manhole covers C) Pipe cracks D) Inflatable dams

Back 37

C) Pipe cracks

Front 38

T38) Which one of the following is a property of chlorine gas? A) Heavier than air B) Harmless to humans C) Highly flammable D) Lighter than air

Back 38

A) Heavier than air

Front 39

T39) What is a mechanical means to remove material from a sewer? A) Herbicides B) Cutting C) Pumping D) Sweeping

Back 39

B) Cutting

Front 40

T40) The purpose of a lift station sign-in log is to

A) Budget lift station visits B) Identify who makes changes in station operation C) Track employee movement for disciplinary actions D) All of the above

Back 40

B) Identify who makes changes in station operatio

Front 41

T30) What information would you consider while clearing a stoppage in a sewer?

A) Nothing-start adding pressurized water to clear the stoppage B) Cause of stoppage C) Time of day D) Staffing requirements

Back 41

B) Cause of stoppage

Front 42

T41) What tools are used with a power rodder?

A) Finger grips B) Pruning shears C) Spring blades D) Videotape camera

Back 42

C) Spring blades

Front 43

T42) Which of the following should be inspected when responding to a lift station alarm?

A) Amount of screenings and trash removals B) Wet well inlet velocities C) Operation of gas masks D) Motor control center and power panel

Back 43

D) Motor control center and power panel

Front 44

T43) The minimum scouring velocity normally used for sanitary collection lines is A) 1.0 ft/sec B) 2.0 ft/sec C) 5.0 ft/sec D) 10.0 ft/sec

Back 44

B) 2.0 ft/sec

Front 45

T44) Tools used for sewer rodding include

A) Lag screw B) Porcupine C) Wildebeest D) Set screw

Back 45

B) Porcupine

Front 46

T45) What equipment is effective in removing an emergency stoppage?

A) Strip chart recorder B) Ultrasonic meter C) Front-end loader D) Hand rodder

Back 46

D) Hand rodder

Front 47

T46) Employers must provide employees with information about possible health effects from contact with hazardous materials. This is called “right-to-know” legislation. Which document provides “right-to-know”?

A) Material Safety Data Sheet B) NPDES permit C) Sewer ordinance D) Clean Water Act

Back 47

A) Material Safety Data Sheet

Front 48

T48) What will happen if the discharge valve on a centrifugal pump is partially closed?

A) Amperage will increase, discharge head will increase B) Amperage will decrease, discharge head will increase C) Amperage will decrease, discharge head will remain constant D) Amperage will decrease, discharge head will decrease

Back 48

D) Amperage will decrease, discharge head will decrease

Front 49

T49) As the impeller wears on a pump, the pump efficiency will

A) Decrease B) Improve C) Increase D) Not change , Cud֝

Back 49

A) Decrease

Front 50

T50) “Schedule 40” refers to pipe

A) flow capacity B) friction loss C) tubing strength D) wall thickness

Back 50

D) wall thickness

Front 51

T51) centrifugal pump parts include

A) diaphragm B) piston C) rotor D) volute

Back 51

D) volute

Front 52

T52) When packing a centrifugal pump, the-packing gland should be tightened

A) slowly over a period of several hours B) to 20 ft-lb C) with wrench and then backed off a quarter turn D) none of the above

Back 52

A) slowly over a period of several hours

Front 53

T53) A venture 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 53

A) difference in pressure between a constricted and a full-size portion

Front 54

T54) The gas most commonly associated with septic wastewater is

A) carbon dioxide B) carbon monoxide C) hydrogen sulfide D) methane

Back 54

C) hydrogen sulfide

Front 55

T55) 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 decomposable 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 55

A) Allows decomposable solids to settle

Front 56

Hydrogen sulfide gas smells like, A) Dead fish B) Fuel gas C) Rotten Cabbage D) Rotten eggs

Back 56

D) Rotten eggs

Front 57

Why are gasoline and volatile solvents objectionable when present in a sewer?

A) They produce an explosion hazard. B) They tend to cause the solids to vaporize. C) They will coagulate floatables and cause stoppages. D) None of the above. d}uZy

Back 57

A) They produce an explosion hazard.

Front 58

T58) The formula for calculating the volume of a cylinder is;

A) V = L x W x H B) V = Distance/time C) V = D2 x .785 x D D) V = D2 x 746 x D

Back 58

C) V = D2 x .785 x D

Front 59

Biological activity in long, sluggish-flow, flat-grade sewer lines will likely cause

A) Concrete and metal corrosion B) Oxygen deficiency in the air in manholes, sewers or wet wells. C) Toxic gas production. D) All of the above.

Back 59

All of the above.

Front 60

T60) Tasks performed by a collection system operator include

A) Cleaning local treatment plants. B) Maintaining collection system equipment. C) Making water connections. D) None of the above.

Back 60

B) Maintaining collection system equipment.

Front 61

T61) One cubic foot per second flow is equal to _______ gallons per hour.

A) 2,794 B) 3,500 C) 6,000 D) 26,928

Back 61

D) 26,928

Front 62

T62) On floors where water or chemicals are commonly spilled, cover the floors with A) Catwalks. B) Linoleum. C) Tile. D) Wood.

Back 62

A) Catwalks.

Front 63

T63) You should never attempt to install, troubleshoot, maintain repair or replace electrical equipment panels, controls, wiring or circuits unless

A) A manhole is overflowing down the street. B) A pump is plugged. C) You are receiving lots of odor complaints. D) You know what you are doing, are qualified, and are authorized.

Back 63

D) You know what you are doing, are qualified, and are authorized.

Front 64

T64) Employee hazards in collection system operations include A) Noxious or toxic gasses or vapor. B) Oxygen deficiency. C) Physical injuries. D) All of the above

Back 64

D) All of the above

Front 65

GPM means gallons per

A) Mile. B) Milliliter. C) Minute. D) Month.

Back 65

C) Minute

Front 66

Leakage of seal water around the packing on a centrifugal pump is required because it acts as a(n)

A) Adhesive. B) Coolant.C. Lubricant . D) Vapor barrier.

Back 66

C) Lubricant

Front 67

T67) What must be checked before entering a manhole?

A) Atmosphere in manhole. B) Equipment. C) Proper barricades or warning devices around manhole. D) All of the above.

Back 67

D) All of the above.

Front 68

In sewer maintenance, what is a pig?

A) A ball forced through a sewer line. B) A power rod. C) Any foul smelling equipment. D) The hydraulic rodding truck.

Back 68

A) A ball forced through a sewer line

Front 69

The purpose of ribs on the outside of a Wayne Sewer Ball is to

A) Allow the ball's weight to be closer to the ball's center. B) Avoid patent infringement that would apply if a non-ribbed ball was used. C) Cause jet action to aid in the hydraulic flushing of the sewer line. D) Reinforce (strengthen) the ball.

Back 69

C) Cause jet action to aid in the hydraulic flushing of the sewer line.

Front 70

A pump is delivering at less than the expected rte of discharge. What will not cause this to happen?

A) Check valve stuck or clogged. B) Discharge head too low. C) Impeller clogged. D) Pump not primed.

Back 70

B) Discharge head too low

Front 71

Wearing rings are installed in a pump to

A) Concentrate wear on an economically replaceable part. B) Hold the shaft in position. C) Keep the impeller in place. D) Wear out rings instead of sleeves.

Back 71

A) Concentrate wear on an economically replaceable part.

Front 72

To properly operate a power rodder

A) Do not jam rodding tool into an obstruction. B) Do not rotate the rod in one position for extended periods. C) If a rod should break, make sure all the torque is out of it before handling it. D) All of the above.

Back 72

D) All of the above.

Front 73

Check valves are used in connection with centrifugal pumps in order to

A) Equalize the pressure on both sides of the impeller. B) Prevent water in the suction line from flowing back into the reservoir. C) Prevent water in the discharge line from flowing back. D) Regulate the rate of water flow through the discharge pipe.

Back 73

C) Prevent water in the discharge line from flowing back.

Front 74

You should get out of a manhole as soon as you start feeling A) Thirsty. B) Sick to your stomach. C) Like sneezing. D) Dirty.

Back 74

B) Sick to your stomach

Front 75

What information must be on a warning tag attached to a switch that has been locked out?

A) Directions for removing tag. B) Name of nearest physician to call in case of emergency. C) Signature of person who locked out switch and who is the only person authorized to remove tag. D) Time to unlock switch.

Back 75

C) Signature of person who locked out switch and who is the only person authorized to remove tag

Front 76

Enclosed, open and semi-closed are terms used for the designation and selection of A) Impellers. B) Lantern rings. C) Sleeves. D) Stuffing boxes.

Back 76

A) Impellers.

Front 77

What is (are) used to remove grease?

A) Bar screens B) Biological treatment. C) Chemicals. D) All of the above.

Back 77

C) Chemicals.

Front 78

A Parshall flume is a type of A) Orifice. B) Submerged nozzle. C) Venturi. D) Weir requiring free-fall discharge.

Back 78

C) Venturi.

Front 79

Which of these chemicals should be used for odor control in sewers?

A) Chlorine B) Muriatic acid. C) Potassium chloride. D) Sodium chloride.

Back 79

A) Chlorine

Front 80

Which of the following are types of shores? A) Bar. B) Hydraulic. C) Sand D) All of the above.

Back 80

D) All of the above.

Front 81

Important traffic safety considerations include

A) Routing pedestrians around a job site. B) Routing traffic around job site. C) Wearing of hard hats and safety vests. D) All of the above.

Back 81

D) All of the above.

Front 82

Which of the following first aid actions would you perform first if an operator inhales chlorine gas?

A) Immediately remove patient from contaminated area. B) Immediately call physician or paramedic. C) Immediately begin appropriate treatment. D) Do nothing, as chlorine gas is non-toxic.

Back 82

A) Immediately remove patient from contaminated area

Front 83

Flatter sewer line grades may cause added sewer maintenance expense and odor nuisance. The problem is most likely caused by

A) A decrease in velocity allowing gases to be released from the wastewater. B) A decrease in velocity allowing organic and inorganic solids to settle out. C) A decrease in velocity which increases the treatment time of the inorganic solids. D) And increase in velocity which decreases the treatment time in the lines.

Back 83

A) A decrease in velocity allowing gases to be released from the wastewater

Front 84

Sources of excessive clear water in a collection system include

A) A problem at the wastewater treatment plant. B) An interceptor sewer leak. C) Exfiltration from a high water table. D) Infiltration from a high water table.

Back 84

D) Infiltration from a high water table.

Front 85

What items would you consider when selecting a solution to clear a stoppage in a sewer?

A) Adding a solution to the upstream manhole to clear the stoppage. B) Cause of stoppage. C) Time of day. D) Staffing requirements.

Back 85

B) Cause of stoppage.

Front 86

T88) With the completion of a sewer cleaning job, which of the following is not necessary to be done at the manhole?

A) Load the debris on the truck. B) Sweep up the debris around the manhole. C) Wash down street around work area and machines, making sure the wash water is broomed into the manhole.ruck.D) Wash down the truck

Back 86

D) Wash down the truck

Front 87

A pH of 7.0 is A) Acid. B) Alkaline. C) Neutral. D) None of the above.

Back 87

C) Neutral.

Front 88

Infiltration is caused by A) Cracked pipes. B) Improper closed circuit TV operation. C) Poor ventilation. D) All of the above.

Back 88

A) Cracked pipes.

Front 89

The main reason for chlorinating wastewater in sewers is for ___ ____ control. A) BOD B) Odor C) Pathogen D) Suspended Solids

Back 89

B) Odor

Front 90

The most important reason for washing hands thoroughly after taking a wastewater sample is to A) Avoid being infected by pathogenic bacteria. B) Avoid contaminating the BOD bottles. C) Avoid smudging the BOD bottles. D) Get the slime off your hands so you won't accidentally drop any glassware.

Back 90

A) Avoid being infected by pathogenic bacteria.

Front 91

Roots can enter collection systems through A) Air gaps. B) Manhole covers. C) Pipe cracks. D) All of the above.

Back 91

D) All of the above.

Front 92

Which of the following is a property of chlorine gas? A) Can be compressed into liquid form. B) Harmless to humans. C) Highly flammable. D) Lighter than air.

Back 92

A) Can be compressed into liquid form.

Front 93

T96) What is a mechanical means to remove material from a sewer? A) Brushing. B) Cutting. C) Pumping. D) Sweeping.

Back 93

B) Cutting.

Front 94

T97) The purpose of a lift station sign-in log is to A) Budget lift station visits. B) Identify who makes changes in station operation. C) Track employee movement for disciplinary actions. D) All of the above.

Back 94

B) Identify who makes changes in station operation.

Front 95

T98) What tools are used with a power rodder? A) Finger grips. B) Pruning shears. C) Spring blades. D) Videotape camera.

Back 95

C) Spring blades.

Front 96

T99) Which one(s) of the following items should be inspected when responding to a lift station alarm at night? A) Amount of screenings and other trash removal. B) Motor control center and power panel. C) Operation of gas masks. D) All of the above.

Back 96

. B) Motor control center and power panel.

Front 97

A PH of 6.0 is A) Acid. B) Alkaline. C) Neutral. D) None of the above.

Back 97

A) Acid