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FD Incident Safety Officer 2nd Edition ORG > Ch. 9: Reading Hazardous Energy > Flashcards

Ch. 9: Reading Hazardous Energy Flashcards

1
Q

Stored potential energy that causes harm if suddenly released.

A

hazardous energy

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2
Q

The effective ISO categorizes the status of hazardous energy forms in one of the following at incidents:

A
  • Stable - Not likely to change
  • Stable - May change
  • Unstable - May require attention
  • Unstable - Requires immediate attention
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3
Q

What is the integrity of electrical systems based on?

A

Their being properly grounded, insulated, and circuit protected.

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4
Q

What path is electricity always trying to seek?

A

Path of least resistance to ground.

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5
Q

What is electrical energy that has established a path to ground through the earth and is energizing it?

A

ground gradient

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6
Q

What is a downed power line an example of?

A

ground gradient (may be energizing the earth in a concentric ring of up to 30’ depending on the voltage of the source)

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7
Q

What is a commonplace in many data storage and processing centers, as well as in telecommunication switch equipment centers?

A

UPS (uninterrupted power supplies) battery rooms

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8
Q

How can pooled water, battery acid, and battery rack hardware become DC energized?

A

Because there is typically no ground fault protection with DC power.

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9
Q

What catches fire, it may burn for several days, and the heat generated from it can cause serious damage to the tension wire infrastructure?

A

Transformers because they can hold several thousand gallons of oil.

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10
Q

High tension wires that separate from anchor points can “reel coil” with tremendous force.

A

When the tension is released suddenly, the wire snaps, or whips, in a direction opposite to the tension force.

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11
Q

What happens when two energies are at play with high tension wires?

A

1st - Law of motion: For every action (or force), there is an opposite and equal action (force).
2nd - Steel retains a certain memory

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12
Q

What is the integrity of a gas system relied on?

A

A tight supply vessel (a tank or piping), a shut off valve, a pressure regulation device, and a distribution system with protection at each appliance (shutoff valve and surge protection).

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13
Q

Water and storm sewer systems can cause safety concerns in numerous incident situations.

A
  • Uncontrolled water flow can cause initial and secondary collapses in structures.
  • A damaged sewer or storm drain system can leech water into surrounding gravel and dirt beds, undermining, the earth supporting a structure, road, or other utility system.
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14
Q

What will result with water that collects in basements or other building areas that may extinguish gas-fired equipment pilot lights?

A

The result that raw gas is being “bubbled” into the water.

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15
Q

What can happen to storm sewer systems in flash flood situations?

A

These systems can be overwhelmed with water and debris.

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16
Q

What are examples of mechanical stored energy?

A

Systems that include pulleys, cables, counterweights, and springs.

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17
Q

What systems use either hydraulics (liquids) or pneumatics (air/gases) as a medium to achieve power or force?

A

Pressurized systems

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18
Q

What should be considered when a victim trapped in a vehicle with an undeployed air restraint safety device is in danger?

A

Consider it an immediate rescue environment

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19
Q

What are the weather considerations that are essential to effective ISO performance?

A

Wind, humidity, temperature, and the potential for change.

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20
Q

What is by far the most important of all the weather considerations affective firefighting operations?

A

Wind

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21
Q

Nothing can change a situation faster - or cause more frustration in an operation - than the effects of _______.

A

wind

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22
Q

How is wind created?

A

As air masses attempt to reach equilibrium.

23
Q

From the ISOs perspective, temperature needs to be evaluated relative to its effect on firefighter exposure.

A

Acclimation is key!

24
Q

What does a thunder clap that is less than 5 seconds from the flash mean?

A

You are in the lightning area.

25
Q

The evacuation of penned, fire-threatened animals is amazingly dangerous.

A

Have a plan.

26
Q

Which is the most important of all weather considerations

affecting firefighting operations?

A

Wind

27
Q

Up to how many feet can a downed power line energize the ground in a concentric circle?

A

30

28
Q

What are the upper/lower (respectively) flammability

limits of propane?

A

9.5/2.4

29
Q

Which is NOT a required component for the integrity of

electrical systems?

A

Sufficiently supplied

30
Q

How many wind direction and speed changes are common in

the vicinity of a thunderstorm?

A

4 or 5

31
Q

Which piece of electrical equipment is a tremendous heat

generator?

A

Generators

32
Q

Which is NOT typically a hazard when dealing with a

substation fire?

A

Pooling water

33
Q

What is a main concern when fighting fires in low and high humidity environments?

A

Dehydration

34
Q

Which is NOT a hazard from the drive/brake system of a

vehicle?

A

Converter

35
Q

Which is a common hazard between the suspension/door

system and the drive/brake system?

A

Springs

36
Q

Which of the following is NOT a way to categorize

hazardous energy forms?

A

Stable-may require attention

37
Q

What can water that has collected in the basement cause to

happen?

A

Extinguish gas-fire equipment pilot lights

38
Q

What is the vapor density of propane?

A

1.5

39
Q

Which is considered the most important utility control?

A

Gas

40
Q

Which is a hazard of a power line?

A

Under tension

41
Q

What is the unit of measure for volume of current flow?

A

Ampere

42
Q

What is the unit of measure for the amount of energy a

specific appliance uses?

A

Watt

43
Q

What factor should you divide the number of seconds

between the lightening flash and the thunder to determine the lightening distance?

A

5

44
Q

What is the force that causes the flow of electricity?

A

Voltage

45
Q

What can happen when the guide wire releases from a sign?

A

Recoil with amazing force

46
Q

Which simple activity is often overlooked that can assist

the ISO in predicting weather that is coming?

A

Watch the sky

47
Q

The stronger the container is, the more initial resistance

to pressure it has and the more explosive it becomes when it fails

A

The stronger the container is, the more initial resistance

to pressure it has and the more explosive it becomes when it fails

48
Q

Up to how many volts can be used with the bright orange

conduit in a hybrid vehicle?

A

700

49
Q

At what size would hail begin to indicate that you are

near the area where a tornado is most likely to form?

A

1/4 inch

50
Q 
What is the ignition temperature (degrees Fahrenheit) of
natural gas (methane)?
A

999

51
Q

What is the unit of measure for resistance of electrical

current?

A

Ohm

52
Q

What is electrical energy that has established a path to
ground through the earth and that continues to energize
the earth?

A

Ground gradient

53
Q

What is the minimum working distance when working around electrical equipment with up to 50,000 volts?

A

10 feet

FD Incident Safety Officer 2nd Edition ORG (18 decks)

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