W65 Self-Rescuer Functionality Quiz

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Oxygen content can reach dangerous levels in hazardous scenarios, such as incidents involving ______

fire

Confined spaces where oxygen content can be dangerous include buildings, manholes, tunnels, chemical tanks, and ______

oil tanks

Hazardous atmospheres may contain toxic gases or ______

vapours

The lungs and respiratory tract are more vulnerable to injury from hazardous atmospheres than any other part of the ______

body Signup and view all the answers

Inhaling heated gases may cause oedema (fluid collection) in the ______

lungs Signup and view all the answers

Mine rescue teams use both open‑circuit and closed‑circuit breathing ______

apparatus Signup and view all the answers

The W65 self-rescuer will require at least ______ oxygen in the air

19.5% Signup and view all the answers

The W65 self-rescuer will protect the wearer against 1% (10,000 PPM) ______ for one hour

carbon monoxide Signup and view all the answers

The W65 self-rescuer will generate heat when exposed to higher levels of ______, thereby shortening the unit’s duration

carbon monoxide Signup and view all the answers

The W65 self-rescuer must be in a respirable atmosphere before removing the ______

unit Signup and view all the answers

The W65 self-rescuer has a service life of 10 years and a shelf life of 15 years when properly ______

stored Signup and view all the answers

Oxygen is released by the chemical reaction of moisture from the exhaled breath mixing with the potassium superoxide (KO2). This reaction produces ______

heat Signup and view all the answers

The frequency of hydrostatic testing for a compressed cylinder depends on the material and ______ used.

model Signup and view all the answers

Breathing air cylinders may also be charged directly from an approved breathable air compressor or compressor/storage ______ configuration.

tank Signup and view all the answers

Hydrostatic testing involves pressurizing a cylinder above its operating pressure to established safety standards to ensure durability of the cylinder over ______.

time Signup and view all the answers

In a cascade storage system, several large cylinders are used to bring a small cylinder up to a desired ______.

pressure Signup and view all the answers

Oxygen cylinders are recharged by transferring oxygen from large-capacity medical-grade oxygen cylinders via high-pressure ______.

pump Signup and view all the answers

A cascade system may be connected to a purification system and air compressor approved for breathable air (CSA Standard Z-180.100). Breathing air cylinders may also be charged directly from an approved breathable air compressor or compressor/storage tank ______.

configuration Signup and view all the answers

A heat exchanger is built into the breathing tube to cool the air before ______

inhalation Signup and view all the answers

A quick‑start system covers the immediate oxygen requirements of the user until the chemical of the canister becomes ______

activated Signup and view all the answers

A number of oxygen generating self-rescuers are available on the market today. Some include: From L-R: Drager Oxy 3000/6000, Drager Oxy SR 90 and CSE Self-Rescuer Long Duration 8-6 CLOSED-CIRCUIT BREATHING APPARATUS (CCBA) (Closed circuit, self-contained, positive pressure, re-breather) A CCBA’s main functions are to absorb carbon dioxide and provide ______

oxygen Signup and view all the answers

CCBAs also recycle the unused oxygen from the wearer’s exhaled breath. The recycled air is enriched with oxygen from a compressed oxygen cylinder prior to ______

inhalation Signup and view all the answers

The positive pressure inside the facepiece protects the wearer from a potentially toxic ______

environment Signup and view all the answers

Modern CCBAs maintain positive pressure by using springs on the breathing bag/chamber and a demand valve when the internal volume of oxygen in the system has ______

decreased Signup and view all the answers

In a self-contained breathing apparatus, breathable air is supplied from a cylinder or released as a product of a chemical reaction that occurs in a component of the apparatus. In an open-circuit apparatus, exhaled air is released into the surrounding atmosphere. In a closed-circuit apparatus, exhaled air is recirculated within the system. Positive Pressure versus Negative Pressure The apparatus will deliver breathable oxygen/air to the wearer under ______ pressure.

positive Signup and view all the answers

A positive pressure system will maintain an internal pressure higher than the external pressure. The advantages of positive pressure:  Reduces the potential for external atmospheric toxins (smoke, gases) to penetrate into the system, i.e. if the facepiece seal is ______.

broken Signup and view all the answers

No added breathing effort is required by the wearer in a positive pressure system as it is ______.

unrestricted Signup and view all the answers

A negative pressure system’s internal pressure is lower than the external ______.