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2018 lieutenant test > SCBA 2017 > Flashcards

SCBA 2017 Flashcards

1
Q

In terms of exposure to toxic gases, what is the most hazardous stage of firefighting operations?

A

Overhaul

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2
Q

When should members don their SCBA?

A

When anticipating entry into an oxygen deficient, toxic, or otherwise hazardous atmosphere

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3
Q

Inspection of SCBA happens when?

A

Upon assuming duty, and after each use

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4
Q

Toxic atmospheres exceeding what temperature shall not be entered without full PPE and SCBA

A

120-130.

1 to 2 breaths of moisture-laden air would pose serious health consequences.

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5
Q

80% of fire fatalities are from what?

A

Inhalation of Toxic gasses.

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6
Q

Name the 7 gases that are listed as the primary cause of fire death due to inhalation.

A

CO, CO2, Hydrogen sulfide(H2S), Sulfur Dioxide(SO2), Hydrogen Cyanide(HCN, Hydrogen Chloride(HO), Phosgene(COCl2).

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7
Q

SCBA shall be placed in service at what concentration of CO?

A

35ppm

Also, the Has-Mat assignment should be requested.

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8
Q

At what concentration will CO cause unconsciousness after a 30 minute exposure?

A

3200ppm or .32%

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9
Q

At what concentration will CO cause immediate unconsciousness and death within 1-3 minutes?

A

12,800ppm or 1.28%

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10
Q

Hydrogen sulfide

A

Colorless gas with the odor of rotten eggs. Heavier than air, very poisonous, corrosive, flammable, and explosive. Caused by the incomplete combustion of material from living things- wool, rubber, and hair.
Exposure causes rapid breathing, followed by complete respiratory collapse.

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11
Q

Sulfur Dioxide

A

Caused by the complete oxidation of sulfur containing materials. Has an extremely irritating effect on the eyes and respiratory tract. The quantities produced by combustion are too low to be considered toxic.

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12
Q

Carbon Dioxide

A

Normal atmospheric concentration around 300ppm(.03%). 5000ppm will cause increased respiration, dizziness, excitement, and sweating. 100,000-200,00 (10-20%) may cause death within a few minutes due to paralysis of respiratory center of the brain.

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13
Q

Hydrogen Cyanide

A

Highly toxic colorless gas produced by the incomplete combustion of nitrogen containing materials (wool, nylon, polyurethane foam, rubber, paper). Bitter almond odor. Kills suddenly by interfering with the oxygen exchange at the cellular level.

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14
Q

Hydrogen Chloride

A

Colorless gas produce by the combustion of materials containing chlorine (PVC’s). Swelling of the upper respiratory tract, acting as an irritant to the heart and causes irregular heart rhythms.

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15
Q

Phosgene

A

Colorless gas produced when refrigerants come in contact with flame. Musty Hay odor.

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16
Q

Phosgene and Hydrogen Chloride have this in common.

A

They decompose/form Hydrochloric acid when they contact water or moisture. Causing burning and blistering to the mucous membranes of the nose, the linings of the lungs, and the tissue of the mouth and throat.

17
Q

CO binds to the hemoglobin at what rate?

A

210 times more readily then O2. Forming Carboxyhemoglobin.

18
Q

Name the major components of the Scott Air-Pak Fifty SCBA.

A
  1. Cylinder and Cylinder valve
  2. Harness and backframe, Dual EBSS(emergency breathing support system) with 3’ of hose, drag rescue loop(DRL) assembly, and RIC/UAC
  3. Pressure reducer assembly
  4. Breathing regulator: vibralert, purge, air saver switch, HUD
  5. Pak-Alert SE distress alarm: sensor module with pak-tracker locator/transmitter, and control console with remote pressure gauge
  6. Facepice
19
Q

How is the air cylinder constructed?

A

An Aluminum shell over-wrapped with carbon fiber.

20
Q

How often should a composite air cylinder be hydrostatically tested per DOT recommendations?

A

Every 5 years.

21
Q

According to Scott, what is the weight of a charged, carbon wrapped SCBA cylinder?

A

17.1 pounds

22
Q

A 60-minute SCBA cylinder contains how much air?

A

87 cubic feet when charged to 4500psi.

23
Q

The pressure reducer is located where? Contains what?

A

On the left side of the packframe. Consisting of redundant dual path reducing systems (primary and secondary circuits), an automatic transfer valve, and over pressure relief.
The primary circuit reduces supply pressure to 100 PSI and sends it to the MMR.

24
Q

What happens when the cylinder falls between 1200-1000 psi or when the primary circuit fails closed?

A

A transfer valve opens allowing the secondary circuit to function. Thus sending air at a pressure of 150psi to the MMR. The addition 50psi activates the Vibralert.

25
Q

What should the pressure inside of the face piece be?

A

With a properly sealed face piece, the breathing regulator produces a pressure approximately .036 to .054 above atmospheric pressure.

26
Q

Spray bar

A

Comprised of 9 holes that direct the flow of air towards the lens, keeping it clear of condensation.

27
Q

The purge valve delivers

A

4.4 cubic feet of air per minute (125 LPM) by rotating the knob 1/2 turn counterclockwise.

28
Q

The vibralert functions when

A
  1. quarter service, 1000-1200psi remain
  2. the primary circuit fails closed.
  3. the primary circuit fails open. Air will be heard flowing from a resettable overpressure valve allowing no more than 225psi to flow tot he regulator. Notify your partner and leave immediately.
29
Q

In regards to the HUD, what happens when the SCBA is turned on?

A

All 5 lights will illuminate for 20 seconds, and must be verified each time the unit is placed in service.

30
Q

What do the lights in the HUD display?

A

Full- 2 green lights
3/4- 1 green light
1/2- Yellow light flashing slowly, once per second
1/4- Red light flashing at 10 times per second

A 5th round red light in the far right indicates Low Battery.

31
Q

The antennas of portables must be kept how far away from the control console and PASS alarm?

A

6 inches to avoid radio frequency interference(RFI), which may cause the PASS alarm to not function.

32
Q

How long does it take for the PASS alarm to activate?

A

After 20 seconds of no motion it will pre-alarm, after an additional 10 the full alarm will sound.
*With fresh batteries full alarm can last 8 hours. 1000 hours in monitoring mode.

33
Q

What are the 5 components to the Scott AV-2000 face pieces?

A

Hard-coated polycarbonate lens bonded to a natural rubber blend seal
2 speaking diaphragms
Nosecup
4 point yellow kevlar head harness

34
Q

How do you achieve optimum communication from the AV-2000 face piece?

A

Place the radio microphone about 1/2” from, and in line with a speaking diaphragm, and speak normally.

35
Q

The Pak-tracker hand held receiver can track up to, from how far away, utilizing what?

A
  • 36 locators transmitters in alarm mode.
  • It can detect a signal from up to 900’ in straight line of sight.
  • They are tracked utilizing aUHF frequency of 2.44GHz allowing multiple RIG’s to track the same transmission.
36
Q

What are the 3 levels of damage to a composite air cylinder?

A

Level 1- cuts or scratches involving the outer surface only
Level 2- cuts or scratches that have penetrated the outer layers of plastic and cut the fiber over-wrap threads
Level 3-Cuts greater than 2 or that have exposed bare metal

Remove from service if greater then Level 1.

37
Q

When using the EBSS, from which cylinder does the air flow?

A

Lowest cylinder pressure first, until depleted to less than 500psi at which time it switches to the cylinder with the higher pressure. Vibralerts will function for both when the cylinders being utilized fall below 25% (1000-1200psi)

38
Q

How should a member clean and disinfect their face piece?

A

Utilizing Wescodyne Plus- 3 full pumps on the regulator side and 3 on the face side. Allow 10 minutes contact time. Rinse with cool or warm water not to exceed 110 degrees.

2018 lieutenant test (6 decks)

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