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Class SD Wastewater Exam > Wastewater Exam 2 > Flashcards

Wastewater Exam 2 Flashcards

1
Q

An operator should have an opportunity to review the lift station design in the following stages like planning stage, ____% design review, ____% design review, and ____% design review.

A

20%

40%

90%

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2
Q

The appropriate time to to develop and record both routine and emergency information and procedures for a new lift station is when?

A

Preliminary inspection

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3
Q

Lift station operation under test conditions will reveal only the ____________ equipment and construction problems.

A

Immediate

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4
Q

Official acceptance of completed corrective work for a lift station is the ______________ job.

A

Engineer’s

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5
Q

Mark each piece of lift station equipment with an identification code number and record the number and keep a minimum of ___ copies of this information.

A

2

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6
Q

When a new lift station is put in, it should be put on the preventative maintenance schedule when?

A

Right away

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7
Q

If the wet well is to be entered, all __________ _________ entry procedures must be followed.

A

Confined space

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8
Q

Before entering a wet well, you set up a blower that will give a minimum of _____ air changes a minute within the wet well.

A

2

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9
Q

If all conditions are satisfactory, then and only then is it permissible to ________ the wet well.

A

Enter

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10
Q

When stopping a lift station pump you hear a ratcheting sound. That is what engaging?

A

Backspin preventer

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11
Q

Low head conditions in pumps can be temporarily solved by throttling a discharge valve, or permanently by installing an __________ plate in the discharge.

A

Orifice

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12
Q

If it is a packing gland used if a pump, set the packing so that there will be leakage of approximately ___ drop per ____________.

A

1

Second

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13
Q

When making a lift station visit, for safety, how many operators should make the visit?

A

2

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14
Q

The __________ of the operating agency is the most significant factor determining the frequency of lift station visits.

A

Attitude

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15
Q

Lift stations should be checked how frequently?

A

Daily

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16
Q

Monitoring and telemetry systems are frequently referred to as SCADA which stands for?

A

Supervisory Control And Data Acquisition system

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17
Q

Wherever flows from one sewer meet and join the flow of another, the flow should always be going __________ in the same direction.

A

Downstream

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18
Q

High velocity cleaners, balls, kites, bags, parachutes, tires and scooters are all apart of what cleaning method?

A

Hydraulic cleaning

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19
Q

Bucket machines, power rodders, hand rods, and winches for pulling a variety of scraping equipment is apart of what cleaning method?

A

Mechanical cleaning

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20
Q

The cleansing action of high velocities of water in the line is considered?

A

Hydraulic cleaning

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21
Q

When cleaning sewer pipes at least __ operators are needed for cleaning lines up to 18 inches.

A

3

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22
Q

Do not attach a line to one nipple on the sewer cleaning ball, and then another line on the other nipple on the other side because this will reduce the __________ action desired for cleaning.

A

Swirling

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23
Q

A sewer cleaning ball method will function very well with ____ feet of head in the upstream manhole to create a ____________ velocity around the ball.

A

2.0

Scouring

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24
Q

When capturing debris from a balling sewer cleaning method, do not use a sand trap or retard the flow because it can hinder the _____________ of the balling operation.

A

Effectiveness

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25
Q

As the diameter of the pipe gets larger, the hydraulic sewer cleaning method becomes ______ effective.

A

Less

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26
Q

True or False. You should never throttle or control flow from a fire hydrant with a hydrant valve because this could damage the valve.

A

True

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27
Q

Always use a hydrant wrench and never use a pipe wrench on the hydrant valve because the valve nut is ______ and can easily be ___________.

A

Brass

Damaged

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28
Q

When filling hydraulic cleaners from hydrants, never throttle or control water front the hydrant valve. It should be open ____________.

A

Completely

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29
Q

You must use an _____ _____ for the water going into the tank from the fill line to prevent a cross connection.

A

Air gap

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30
Q

A 1,000 gallon water tank when full will weigh how much?

A

8,340 pounds

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31
Q

The lower the angle of the sprayer nozzle in hydraulic cleaners, the higher amount of _______ will be experienced.

A

Thrust

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32
Q

With high velocity cleaning, the first ___ feet of sewer hose just behind the nozzle will be the first to wear.

A

10

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33
Q

High velocity cleaning machine is also used for stoppages in sewers. To remove stoppages you would use a nozzle with a __________ jet as well as ______ jets.

A

Forward

Rear

34
Q

To avoid blowing toilets with high velocity cleaning method, use a _________ angled nozzle at a minimum pressure when climbing the pipe.

A

Steeper

35
Q

Observations of lower than expected flows at a downstream manhole thus indicate that the upstream segment of the line requires additional what?

A

Cleaning

36
Q

Kites, bags, and poly pigs describe equipment commonly used to clean __________ diameter sewers.

A

Larger

37
Q

Power bucket sewer cleaning machines should only be used in _________ sewers and to avoid using it in __________ sewers.

A

Larger

Smaller

38
Q

During power bucket operations, when cleaning small lines you set up in the ___________ manhole. When cleaning larger lines, you set up in the __________ manhole.

A

Downstream

Upstream

39
Q

What is one of the first problems encountered during power bucket operations?

A

Roller security

40
Q

During sewer rodding operations, use an attachment that is slightly _________ then the pipe itself.

A

Smaller

41
Q

When a rodding tool encounters a blockage it will stop rotating but the rodding machine will continue to turn it creating multiple loops in the pipe. This is known as what?

A

Over torque

42
Q

The most common method of cleaning a force main is using __________ _______ better known as _______ ______.

A

Polyurethane swabs

Poly pigs

43
Q

Odor control is usually obtained by controlling the production of what?

A

Hydrogen sulfide

44
Q

One of the most common causes of odors results when the ____ _____ in the sewer above the wastewater is stopped.

A

Air flow

45
Q

The major portion of the sulfide content in wastewater arises from the conversion of ________ to ________.

A

Sulfate

Sulfide

46
Q

What type of reactions produce sulfide in the slimes?

A

Anaerobic

47
Q

In general, the faster and more turbulent the flow, the more oxygen is dissolved, and thus more ________ is oxidized to produce _________.

A

Sulfide

Sulfate

48
Q

The higher the wastewater temperature, the __________ the production of hydrogen sulfide.

A

Greater

49
Q

Chemical treatment in sewers is not a permanent answer, it provides relief under acuter conditions but is too _____________ for continuous use.

A

Expensive

50
Q

Hydrogen sulfide is produced by ________ reducing ___________ organisms that can thrive in wastewater.

A

Sulfur

Anaerobic

51
Q

The greater the rate of Biochemical Oxygen Demand (BOD), the greater the rate of what generation?

A

Sulfide

52
Q

What is the most widely used chemical for hydrogen sulfide control?

A

Chlorine

53
Q

Recent studies have shown that one of the major sources of infiltration is the __________ connection between the house and the _____________ sewer.

A

Lateral

Mainline

54
Q

When collection systems are installed above the water table, infiltration is not the problem but ____________ is.

A

Exfiltration

55
Q

When doing a TV inspection of a sewer it is only necessary to record video tape of the __________ of the sewer line.

A

Defects

56
Q

When the pipes are offset, and the televising camera must drop down to get into the next section of pipe it’s considered a what?

A

Drop joint

57
Q

When the pipes are offset, and the televising camera has to be lifted up in order to get into the next section of pipe it’s considered a what?

A

Jump joint

58
Q

If a difference of more than one percent in the total distance measured and footage recorded on the log when televising, add an __________ ___________ to the log.

A

Error Factor

59
Q

The use of smoke to find the sources of entry into a collection system, broken sewers, and illegal connections is considered what?

A

Smoke testing

60
Q

When a number of dye tests are to be conducted on the same sewer line, the dye testing should start at the farthest _________________.

A

Downstream

61
Q

What are the three most common hazardous diseases collection systems operators experience?

A

Tetanus

Typhoid

Polio

62
Q

Hydrogen sulfide is generated during the _______________ ______________ of organic matter.

A

Anaerobic

Decomposition

63
Q

An upper limit of ______ percent oxygen in working atmospheres is recommended.

A

21.9 %

64
Q

All employees working within ____ feet of a roadway are required to wear a safety vest.

A

10 feet

65
Q

All employees in an agency vehicle while in motion must wear a seatbelt at speeds greater than ____ mph.

A

5 mph

66
Q

The most important reason we need wastewater collection systems is what?

A

Sanitation

67
Q

Life cycle cost of a piece of equipment has two costs, what are they?

A

Acquisition cost and

Ongoing costs

68
Q

Ongoing costs are _____ to _____ times the original acquisition cost for equipment.

A
  1. 9

4. 8

69
Q

Building sewer ________ ________ are used to prevent the passage of gases and odors from the main sewer into a building sewer.

A

Vent traps

70
Q

As a minimum, a clean out should be located in the building sewer approximately ____ feet from the building foundation

A

3

71
Q

Manholes are usually placed ______ to ______ feet away from one another.

A

300

500

72
Q

A speed which will prevent the deposition and buildup of solids in the sewer is called?

A

Scouring velocity

73
Q

What connections are primarily used in pump station piping systems where cast or ductile iron piping is common?

A

Flanged connections

74
Q

An effective way to minimize short cycling of pumps is to use what alternation?

A

Automatic Lead/Lag

Selects a different pump every turn

75
Q

Variable speed pumps adjust the pump speed to _________ the pumping rate with the flow rate into the ______ ________.

A

Match

Wet well

76
Q

The wet well atmosphere according to the National Electrical Code is classified as a Class ___, Division ____ area and all electrical systems must be explosion proof.

A

1

1

77
Q

Most lift stations have 480V 3-phase power as well as _____/______V, 1 phase.

A

110/220V

78
Q

If you are working in the collection system industry you can expect at least a ___ in ____ chance of experiencing a disabling injury.

A

1 in 10

79
Q

The greatest return in a safety survival program in the prevention of human _____________.

A

Suffering

80
Q

Who reviews, analyzes and determines how each accident occurred and why?

A

The Safety Committee

81
Q

What is a space which by design has limited openings for entry and exit; and/or natural ventilation which could contain or produce unfavorable atmospheric conditions; and is not intended or designed for continuous employee occupancy?

A

Confined space

Class SD Wastewater Exam (2 decks)

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