Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Basic Wastewater Collection and Treatment > Class 1 Wastewater Distribution and Collections > Flashcards

Class 1 Wastewater Distribution and Collections Flashcards

1
Q

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

A

Prevent water in discharge line from flowing back

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

A lantern ring is

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

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

Rotten eggs

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

A pH of 6.0 is

A

acid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

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

A

cause jet action to aid in the hydraulic flushing of the water sewer line

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Your chlorinator room should have an exhaust vent installed

A

near the floor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Leakage of seal water around the packing centrifugal pump is require because it acts as a

A

lubricant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

The flushing water pressure in water-lubricated wastewater pump should be at least ____ pump discharge pressure,

A

5 psi more than

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What factors should be considered when providing trench shoring?

A

structures or sources of vibrations trenches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What factors should be considered when providing trench shoring?

A

Structures or sources of vibration near trenches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Given the data below, what is the most likely cause of the lift station problem?
Data: * Wet well inlet is normal
* well drops normally when pump #1 is running
* well level rises slowly when pump #2 or pump #3 is running
* run amperage is the same for all three pumps
* one of the pump motors turn backwards when off
* level system is reading correctly
* electrical controls are all in automatic

A

Pump #1 check valve stuck open

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Task least likely to be performed by collection systems personnel is

A

Making water connections

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

When opening a power rodder properly, do the following

A

Make sure all the torque is out of a broken rod

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

In keeping records,

A

Records should be kept up-to-date and maintained as long as they are useful

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Which one of the following would not be considered a natural event? (explosion, flood, lightning, tornado)

A

explosion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

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

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

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

A

The produce and explosion hazard

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

If you were in charge of a large operation with four foremen, three whose work was exceptionally good and a fourth whose work was substandard, what should you do?

A

Discuss the problem with the substandard foreman and offer to help before any other action is taken

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Which of the following is a type of shore? (bar, aluminum hydraulic, truss, sand)

A

Aluminum hydraulic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

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

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

A venturi meter measures quantity of fluid by

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

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

A

Impellers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

What must be checked before entering a manhole? (atmosphere in manhole, safety equipment, proper barricades or warning devices around a manhole, all of the above)

A

All of the above

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Which of the following is not typical of a “submersible” pump?

A

Requires water lubrication

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

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

A

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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

Biological hazards in collection system operations include

A

Hepatitis A

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

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

A

Discharge head too high

28
Q

In sewer maintenance, what is a pig?

A

A bullet shaped object passed through a force main

29
Q

Mechanical ventilation of a lift station is required to

A

Ensure safe working access

30
Q

When opening a power rodder properly, do the following

A

Make sure all the torque is out of a broken rod

31
Q

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

A

Backwater valve

32
Q

The most important traffic safety consideration is the

A

Wearing of hard hats and safety vests

33
Q

Which of these chemicals may be used for odor control in sewers? (chlorine, muriatic acid, potassium chloride, sodium chloride)

A

Chlorine

34
Q

Sources of excessively clear water in a collection system include

A

Infiltration from a high water table

35
Q

Grease in sewers is mechanically removed by

A

High-pressure jets

36
Q

Infiltration may result from

A

Bad joints

37
Q

Which one of the following is a property of chlorine gas? (heavier than air, harmless to humans, lightly flammable, lighter than air)

A

Heavier than air

38
Q

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

A

Cutting

39
Q

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

A

Identify who makes changes in station operation

40
Q

What tools are used with a power rodder?

A

Spring blades

41
Q

The minimum scouring velocity normally used for sanitary collection lines is

A

2.0 ft/sec

42
Q

What equipment is effective in removing an emergency stoppage?

A

Hand rodder

43
Q

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

44
Q

Who must review plants for final approval before a new sewer can be constructed?

A

Ohio EPA

45
Q

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

A

Amperage will decrease, discharge head will decrease

46
Q

“Schedule 40” refers to pipe

A

Wall thickness

47
Q

Employee hazards in collection system operations include (noxious or toxic gasses or vapor, oxygen deficiency, physical injuries, all of the above)

A

All of the above

48
Q

Shoring must protrude ____ above the top of the excavation

A

18 inches

49
Q

In a trench deep enough to require a ladder(s), the worker must not be required to travel more than _______ to get to the ladder

A

25 feet

50
Q

Any excavation over _______ must have a ladder for the worker to get in and out of the trench

A

4 feet deep

51
Q

Given the data below, what is the most likely cause of the lift station problem?

DATA: Wet well inlet is normal, Well drops normally when pump #1 is running, Well level rises slowly when pump #2 or pump #3 is running, Run amperage is the same for all three pumps, One of the pump motors turn backwards when off. Level system is reading correctly. Electrical controls are all in automatic

A

Pump #1 check valve stuck open

52
Q

An engineer must approve any trench shoring design above

A

20 feet deep

53
Q

All simple slope excavations 20 feet or less in depth shall have a maximum allowable slope of

A

1 1/2:1

54
Q

According to “Ten State Standards” When a sewer is installed parallel to a water line, it must be a minimum of _________ away (measured from the outside diameters)

A

10 feet

55
Q

What is the minimum distance from the edge of the spoils to the edge of the trench

A

2 feet

56
Q

A(n) _________ is required for any CSO outfall pipe.

A

NPDES Permit

57
Q

Shoring must protrude ________ above the top of the excavation.

A

18 inches

58
Q

Before any excavation can be done, you must notify__________________.

A

the Ohio Utilities Protection Service

59
Q

The bottom of a water line crossing above a sewer line must be ______ from the crown of the sewer.

A

18 inches

60
Q

In keeping records,

A

Records should be kept up-to-date and maintained as long as they are useful

61
Q

A mechanical ventilation system for the wet well portion of a lift station which operates continuously should be able to exchange the air in the wet well_____ times an hour

A

6

62
Q

What is the greatest distance at which manholes should be installed for an 8-inch sewer line?

A

300 feet

63
Q

“Hz” stands for

A

cycles per second

64
Q

Which of the following are reasonable or valid objectives of a cost accounting program for a wastewater utility? (Identify methods or measures for controlling increases in operating costs, provide data for budget development and preparation, provide data that helps in making decisions about making repairs versus replacement of equipment, all of the above)

A

All of the above

65
Q

Ideally, the pH meter should be standardized

A

Before each use

66
Q
A

Basic Wastewater Collection and Treatment (2 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions