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MTech Test > Utility Manual > Flashcards

Utility Manual Flashcards

1
Q

What does the electrical distribution system include?

A

Primary and secondary lines

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2
Q

What does the abbreviation K stand for?

A

1000

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3
Q

Momentary Outage?

A

Electrical outage lasting two minutes or less

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4
Q

Pothead?

A

A device which provides transition between underground cable to overhead lines or conductors

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5
Q

Recloser?

A

An automatic protection device that senses and interrupts distribution system faults

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6
Q

Riser?

A

The conductor part of transition leading from underground to overhead

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7
Q

Sectionalize?

A

The process of opening switches or fuses to divide a circuit into sections to isolate the cause of the power outage. This reduces the impact of the power outage to the fewest possible customers by allowing power to move through undamaged parts of the system

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8
Q

What electrical service is taken at less than 2000 volts?

A

secondary

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9
Q

Stopcock Valve

A

a quarter-turn valve used to restrict or isolate the flow of liquid or gas in a pipe

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10
Q

Sustained Outage?

A

An electrical outage lasting longer than 2 minutes

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11
Q

Time Weighted Average (TWA)?

A

THe average exposure to a contaminant or condition (such as noise) to which workers may by exposed without adverse effect over a period such as in an 8hr day or 40hr week

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12
Q

What does a vapor density of less than 1 indicate, more than 1?

A

Less than 1 indicates it is lighter than air while greater than 1 is heavier

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13
Q

What color codes are approved by Virginia State Corporation Commision for underground utilities?

A

American Public Works Association’s (APWA)

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14
Q

What shall all marks and markers indicate?

A

Name, initials, or logo of the company that owns or operates the line and the width of the facility if it is greater than 50mm (2in)

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15
Q

Red markings indicate?

A

electrical, cable, conduit and lighting cable

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16
Q

Yellow markings indicate?

A

gas, oil, steam, petroleum or gaseous materials

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17
Q

Orange markings indicate?

A

communications, alarm, or signal lines, cable or conduit

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18
Q

Blue markings indicate?

A

potable water

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19
Q

Purple markings indicate?

A

Reclaimed water, irrigation and slurry lines

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20
Q

Green markings indicate?

A

sewer and drain lines

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21
Q

Pink markings indicate?

A

Temporary survey markings

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22
Q

White markings indicate?

A

Proposed excavation

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23
Q

CI stands for?

A

Cast iron

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24
Q

CPR stands for?

A

copper

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25
Q

DI stands for?

A

Ductile iron

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26
Q

PL stands for?

A

plastic

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27
Q

PVC stands for?

A

polyvinyl chloride

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28
Q

RFC stands for?

A

Reinforced concrete

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29
Q

SCC stands for?

A

steel cylinder concrete

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30
Q

STL stands for?

A

steel

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31
Q

TC stands for?

A

terracota

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32
Q

TR stands for?

A

transite

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33
Q

W/STL stands for?

A

wrapped steel

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34
Q

What does methane consist of?

A

carbon and hydrogen

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35
Q

What is the vapor density of methane?

A

.55

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36
Q

At what times is natural gas not odorized?

A

In transmission pipelines and rail cars

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37
Q

What is the flammable range for natural gas?

A

5-15%

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38
Q

What is the ignition temperature for natural gas?

A

1200 degrees

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39
Q

What is expansion ratio of liquefied natural gas to a gas?

A

600:1

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40
Q

What is the typical operating pressure of gas lines?

A

.25-55lbs per square inch (psi)

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41
Q

Gas transmission lines range in size from what to what, and have pressures up to _____, They also can generate ____ to _____ volts of static electricity?

A

6”-30”, pressures up to 450psi, and 2000-24000 volts

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42
Q

Firefighters should note the following information concerning marking systems for pipelines:

A
  • markers show the pipeline’s approximate location
  • signs on the markers list the commodity transported, name of the pipeline company and a telephone number where company representatives can always be reached
  • markers DO NOT indicate how deep the pipeline is buried r how many lines are in the area
  • pipelines do not necessarily follow a straight line between two markers
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43
Q

In order to protect pipelines from mechanical damage what is installed at all major vehicular road and railroad crossings?

A

road casings

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44
Q

What is the trade name for flexible gas line?

A

Corrugated stainless steel tubing or CSST/Trac Pipe or Ward Flex

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45
Q

If there is a gas leak in a void space where can it be detected?

A

Around light switches and electrical outlets

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46
Q

What is the proper sequence for shutting off natural gas?

A
  1. At the appliance
  2. At the meter
  3. At the curb box
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47
Q

What wrench should be used to remove the cover of the street valve?

A

5 sided wrench

48
Q

If you cannot manipulate the nut on the cover of a street valve what should be done?

A

Use a striking tool to break that cast iron cover

49
Q

Is the curb box connected to the valve?

A

No it just rests on it

50
Q

For outside gas leaks what is the standard positioning for engine companies?

A

Upwind of the hazard area, identify an adequate water supply and position no closer than 100’ for the first arriving unit and a minimum of 300’ for all other incoming fire apparatus

51
Q

When positioning on a inside gas leak units should take care to avoid parking where?

A

Next to any side of the affected address

52
Q

If an outside gas leak line is over what in diameter the incident should be upgraded to a hazmat response?

A

2”

53
Q

Besides the leaking gas what is another serious hazard during a leak?

A

Static electricity

54
Q

In what situation may fire department personnel crimp or clamp any leaks?

A

Only in an extreme life saving situation

55
Q

What is the best course of action if the gas leak if prior to a shut off?

A

No action

56
Q

At what depth must a trench be shored?

A

5’

57
Q

In order to protect utility company workers, firefighters should position with?

A

A 20lb dry chem upwind and a charged hose line when necessary

58
Q

What gas valves should not be operated?

A

street valves

59
Q

What is the suggested evacuation distance for gas leaks?

A

330’

60
Q

If the FD is going to clamp or crimp a line it must be ____ or smaller.

A

3/4”

61
Q

For an outside gas fire what at minimum should be deployed?

A

1 3/4” line and dry chem extinguisher

62
Q

If an IDLH atmosphere is identified on an inside gas leak what shall be identified and consideration shall be given to what?

A

RIT and full structure fire response

63
Q

When should intrinsically safe equipment be turned on?

A

prior to entering a gaseous atmosphere

64
Q

What specific areas must be checked during natural gas leaks?

A

Upper stories, attics and cocklofts

65
Q

What is the street pressure of natural gas and what does the regulator reduce it to?

A

40psi to 1/2 to 1/4 psi

66
Q

What are the two basic types of gas meters?

A

inside and outside

67
Q

When sizing up a building for meters examine all areas of exterior walls near to ground to approx. how high above the ground?

A

5’

68
Q

If the gas shut off inside a residential installation cannot be operated due to fire or accessibility where should the gas be turned off at?

A

curb box

69
Q

At times when the FD has been called for an inside gas leak and nothing has been found what may be the source of the odor?

A

Sewer gas from a drain that has not been used recently…the water in the trap may have evaporated and expose the building to sewer gas

70
Q

What is the expansion ratio of propane?

A

270:1

71
Q

What is the vapor density of propane?

A

1.56

72
Q

What is the LEL and UEL of propane?

A

2.3 and 9.5

73
Q

What does one gallon of liquid propane weigh?

A

4.23lbs

74
Q

What is the ignition temperature of propane?

A

920-1120 degrees

75
Q

What is the rate mercaptan is added to propane?

A

one pound per 10,000 gallons of liquid propane which equates to one part per billion

76
Q

What is the recommended handlines for vapor dispersion?

A

(2) 1 3/4” lines with nozzles on a narrow fog

77
Q

The most common propane incident will involve what size cylinder?

A

20lb cylinder

78
Q

How many 20lb cylinders are in circulation?

A

50million

79
Q

At what point does the relief valve activate on propane tanks?

A

250psig and 375psig

80
Q

How much air space does a propane tank need to accommodate changes in ambient temperatures?

A

20%

81
Q

Is it safer to have a liquid or vapor propane leak?

A

Vapor

82
Q

How many GPM stream can effectively cool a 20-100lb propane tank?

A

50gpm

83
Q

What are two indications during a propane tank fire that you should leave immediately?

A
  • Hearing a rising sound from venting safety devices

- Discoloration of the tank

84
Q

What is the best way to move a propane tank?

A

Turn it on its side and roll it away

85
Q

Dangerous amounts of CO can accumulate as a result of:

A
  • Poor installation
  • Poor maintenance or failure or damage to an appliance in service
  • Fuel is not burned properly
  • Rooms are poorly ventilated and the CO is unable to escape
86
Q

What is the LEL and UEL for CO?

A

12.8-74%

87
Q

What is the initial alarm for CO emergency?

A

1 Engine, 1 EMS unit

88
Q

At what CO reading shall an occupancy be immediately evacuated and crews shall done SCBA?

A

35ppm

89
Q

If your investigation on CO call reveals readings of greater than 10ppm what should to tell the occupants?

A

Notify them of above normal readings and advise them that they need to have their appliances checked by an approved service rep

90
Q

As little as how many amps can be fatal?

A

50milliamps

91
Q

Define voltage?

A

Force motivating electrons to flow in a circuit

92
Q

What is current measured in?

A

amps or amperes and is the amount of electricity flowing through a wire or conductor

93
Q

What is the speed of electricity?

A

186,000miles per second

94
Q

Define current?

A

continuous movement of free electrons through the conductors of a circuit

95
Q

What determines the severity of an electrical shock?

A

amount of current

96
Q

What is step potential/ step voltage or ground gradient?

A

Voltage difference between two points

97
Q

What does the distribution system for electricity include?

A

power plants, transmission lines and substations

98
Q

When power leaves the substation it does so on what lines?

A

Primary lines

99
Q

When the power leaves the power plant it travels on?

A

transmission lines/high voltage lines

100
Q

How many houses does one transformer normally carry?

A

10 houses

101
Q

What is the power line from the pole to the house or business called?

A

Secondary lines

102
Q

Secondary lines consist of?

A

3 lines- 2 insulated that carry the power and 1 un-insulated line which is the netural

103
Q

How are electrical fires best handled?

A

Shutting down the power source

104
Q

What is the most hazardous condition involving power lines?

A

When the lines do not come in contact with the ground

105
Q

How far away from a vehicle with downed power lines on it should you stay?

A

30’

106
Q

What is the general safe distance rule for power?

A

1.5x the distance between power poles

107
Q

If wires are arcing what should personnel do?

A

Advise their dispatch center of the situation

108
Q

After the power is removed from a transformer that is on fire what shall be used to extinguish any remaining fire?

A

Dry chem or CO2

109
Q

Are firefighters allowed in underground electric vaults, manholes or substations?

A

Never

110
Q

What gas is produced and a concern with vault fires located in structures?

A

CO

111
Q

When electrical wiring burns in a confined space it gives off large amount of?

A

CO

112
Q

What is an interstitial space?

A

An intermediate space located between regular use floors

113
Q

What is normally the safest place for FD to lock out power?

A

Electric panel

114
Q

What is electrical contact based on?

A
  • Shock intensity
  • Path
  • Length of contact
115
Q

If it is not practical to wait for the utility company to arrive on scene after shutting off the service what should be done?

A

Red utility shut off tag or notification tag and attach it to the affected appliance or lock out

MTech Test (19 decks)

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