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S-B Collections Exam > S-B Flashcards > Flashcards

S-B Flashcards

1
Q

What type of fire extinguisher do you use with an electrical fire?

A

Halon (Rated for Class C fire)

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2
Q

According to MN department of labor and industry, how many people should be at the outside entrance of a confined space when occupied?

A

One, with radio contact

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3
Q

What should the alarm set point be for an H2S meter?

A

10 ppm

1 ppm recommended

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4
Q

What three things should be on the tag attached to something that has been locked out?

A

Signature or initials of who locked it out
Date
Project

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5
Q

A material safety data sheet (SDS sheet) contains information on what three things?

A

Flammability limits
PPE
Hazards

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6
Q

What is the minimum percent oxygen in an atmosphere that is deemed safe by OSHA and MnOSHA?

A

19.5%

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7
Q

Alarm settings on explosive meters should be adjusted to go off when the concentration reaches ________ of the LEL.

A

10%

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8
Q

What is one item that is one of the most important pieces of standard safety equipment for field crews?

A

Atmospheric testing equipment (gas meters)

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9
Q

What is one safety program responsibility of the field supervisor?

A

Identify and correct unsafe practices and conditions

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10
Q

What is an important factor when considering what type of trench shoring to use in an excavation?

A

Soil structure

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11
Q

What is the first thing that you should do prior to beginning an excavation in order to determine the location of buried utilities?

A

Call GSOC (Gopher State One Call)

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12
Q

What does MSDS stand for (now SDS)?

A

Material Safety Data Sheet (Safety Data Sheet)

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13
Q

What does OSHA stand for?

A

Occupational Safety and Health Association

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14
Q

OSHA makes rules that govern workplace what?

A

Safety

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15
Q

States can adopt OSHA workplace safety rules or make them more stringent, but not what?

A

Less stringent

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16
Q

Odorless, colorless, lighter than air, and explosive are traits of what gas?

A

Methane

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17
Q

If I and I is reduced, and flow is reduced, H2S in the sewer could what?

A

Increase

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18
Q

When flagging for traffic control, may the flagger override stop or yield signs?

A

Yes

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19
Q

Methane has a specific gravity of 0.5537. Is this lighter or heavier than air?

A

Lighter (air is 1.0)

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20
Q

Since methane is lighter than air, where would it be in a manhole?

A

Top of manhole

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21
Q

Hydrogen sulfide (H2S) has a specific gravity of 1.1763. Is this lighter or heavier than air?

A

Heavier (Air is 1.0)

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22
Q

Since hydrogen sulfide (H2S) is heavier than air, where would it be in the manhole?

A

At the bottom

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23
Q

Who take precedence, OSHA or MnOSHA?

A

OSHA

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24
Q

What covers all physical and safety aspects of a substance, including boiling point, specific gravity, flammability, explosion, LEL limits and suggested PPE?

A

SDS of a substance (Safety Data Sheet) formerly MSDS

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25
Q

How long do you retain a SDS (Safety Data Sheet)?

A

Keep forever

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26
Q

What is one method of reducing infiltration?

A

Sliplining (or other types of lining)

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27
Q

What type of piping material should be used for a shallow line under a busy highway?

A

Ductile iron (DIP)

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28
Q

What develops when the flow velocity in a collection system is two feet per second or more?

A

Scouring action

29
Q

Daily activity reports are used for ___________ or _____________ personnel to work crews.

A

Rotation, reassigning

30
Q

What is the minimum allowable diameter of a manhole?

A

48 inches

31
Q

You have a 60 inch interceptor sewer and waste is flowing at 15% of the design flow through it, this may allow the waste to turn ___________ prior to reaching the WWTP.

A

Septic

32
Q

Manholes must be installed how far apart for a 12 inch sewer line?

A

400 ft apart

33
Q

When using a floating object in a sewer half full to measure flow velocity between manholes, the velocity of the float will be what?

A

Average velocity of wastewater

34
Q

What is the minimum horizontal distance between water mains, and sewer lines?

A

10 ft

35
Q

Why should trenches be properly backfilled and compacted?

A

To prevent damaging pipes from settling

36
Q

What is the maximum size (rating) of fuse placed in the electrical circuit of a motor having a low starting load?

A

3 X the motor (whatever is on the data plate)

37
Q

When shoring a trench, the uprights must be within ________ ft from the bottom of the trench.

A

1.5 ft

38
Q

Collection systems are designed to convey peak flows for a period of how many years?

A

10-30 years (20 years)

39
Q

If a lift station discharge pipe has lots of valves and fittings what should be taken into consideration when designing the pipe?

A

Friction loss

40
Q

What is the minimum vertical distance between water and sewer lines?

A

18 inches (1.5 feet)

41
Q

What is required when a sewer line enters a manhole 24 inches or more above an invert?

A

Drop line (Drop)

42
Q

An area that is not designed for continuous operator occupancy is considered a what?

A

Confined space

43
Q

Advance warning, transition, buffer, work, and termination are the 5 things in order, necessary for a proper what?

A

Traffic control zone

44
Q

What are the three different mandatory protective systems for operators working in excavations or trenches?

A

Shoring, shielding, sloping/benching

45
Q

What gas commonly found around decaying organic matter is highly toxic, smells like rotten eggs, and is heavier than air?

A

Hydrogen sulfide

46
Q

What does LEL stand for?

A

Lower Explosive Limit

47
Q

When working in a confined space, an operator must always wear what?

A

Safety harness with lifeline

48
Q

When there will be operations performed in a confined space that may produce a spark, what is required?

A

Hot Work Permit

49
Q

What is the IDLH (Immediate Danger to Life and Health) level for hydrogen sulfide?

A

0.15% or 1500 ppm

50
Q

The procedure to calibrate a gas meter with gas canisters is called a what?

A

Bump test

51
Q

At what excavation depth does OSHA require shoring?

A

5 feet

52
Q

What is the most typical type of pump used in lift stations?

A

Centrifugal

53
Q

If a pump sounds like it’s pumping rocks or marbles then the pump is most likely what?

A

Cavitating

54
Q

The line that goes from a private residence or commercial establishment to the main sewer is what?

A

Sewer lateral

55
Q

What is the minimum velocity that sewage should flow in a collection system?

A

2 feet per second

56
Q

The main line coming out of a lift station is considered a what?

A

Force main

57
Q

High velocity (jet) cleaning and poly pigs are considered what type of sewer cleaning methods?

A

Hydraulic sewer cleaning

58
Q

The lowest area of a manhole would be considered what?

A

The invert

59
Q

The typical method of disposal of screenings from a lift strip would be to get them _____________ and ____________ in a landfill.

A

Dewatered, buried

60
Q

If you notice septic or floating sludge in a lift station wet well, although pump meters all read normal, you would need to ____________ the frequency of pumping.

A

Increase

61
Q

If a three phase motor has lost one phase, what will happen when the operator turns it on?

A

It will not start

62
Q

What is a method of placing a new service line under a major thoroughfare without disrupting traffic?

A

Directional boring

63
Q

Why should lift station pumps not be allowed to start and stop frequently?

A

It will cause excessive wear on the motors

64
Q

When a manhole frame and cover is 6 inches below grade what is typically installed to raise it to proper grade?

A

Grade rings

65
Q

The decay of organic matter when there is little or no oxygen present is called what?

A

Anaerobic decomposition

66
Q

The vertical scale on a pump curve indicates what?

A

Total dynamic head

67
Q

The connection between a storm sewer and a sanitary sewer would be considered a what?

A

Cross connection

68
Q

If a lift station overflows and causes a spill on a weekend, when should the operator notify a state duty officer?

A

Within 24 hours of spill

69
Q

What prevents a backsiphonage of sewage into potable water?

A

Air gap

S-B Collections Exam (1 decks)

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