OH&S PT2

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Questions and Answers

In situations where fire risk is a primary concern, why are cotton overalls preferred over synthetic overalls?

  • Synthetic overalls are more breathable and comfortable.
  • Cotton overalls offer better protection against chemical splashes.
  • Synthetic overalls are cheaper and more readily available.
  • Cotton overalls prevent static electricity buildup, reducing spark risk, and they smolder instead of melting, minimizing skin damage. (correct)

Wearing metal-rimmed glasses is permissible when operating electrical machinery if they are properly grounded.

False (B)

What type of personal protective equipment (PPE) is recommended to protect the feet in consistently wet working environments?

Rubber knee-boots

When working with machinery, it is crucial to ensure that all machine ______ are properly in place to prevent accidents.

<p>guards</p> Signup and view all the answers

Match the type of breathing protection with its primary use:

<p>Basic cloth or paper masks = Protection from dust Cartridge and canister masks = Protection from fumes Air respirators = Protection in environments with oxygen deficiency or high contaminate levels</p> Signup and view all the answers

What is the primary purpose of anti-static soles in safety shoes?

<p>To prevent static build-up in the body, reducing the risk of sparks when working with flammable materials. (D)</p> Signup and view all the answers

What is the recommended attire precaution regarding jewelry when operating machinery?

<p>Avoid wearing dangling jewelry, rings, and watches. (A)</p> Signup and view all the answers

In the event of exposure to dangerous fumes and vapors, which type of fabric is generally preferred for overalls due to its lower absorbency?

<p>Synthetic fabrics (A)</p> Signup and view all the answers

Which of the following actions is the LEAST appropriate initial response during a workplace emergency?

<p>Immediately attempting to extinguish the source of the emergency, regardless of personal risk. (A)</p> Signup and view all the answers

In the event of a workplace fire, consulting the Safety Data Sheets (SDS) should be the immediate first action, even before evacuating or raising the alarm.

<p>False (B)</p> Signup and view all the answers

Explain how the removal of any single element from the 'fire triangle' can prevent or extinguish a fire.

<p>Removing any one element – heat, fuel, or oxygen – disrupts the chemical reaction of fire. Without all three, combustion cannot occur or will cease.</p> Signup and view all the answers

Fire extinguishers work by removing one or more elements of the ______ triangle.

<p>fire</p> Signup and view all the answers

Match each element of an effective emergency response plan with its key purpose:

<p>Chain of Command = Establishes clear lines of authority and decision-making during the emergency. Communication Procedures = Ensures information is disseminated quickly and accurately to all personnel. Evacuation Procedures = Provides a safe and orderly method for personnel to leave the affected area. Designated Assembly Point = Offers a location to account for all personnel after an evacuation.</p> Signup and view all the answers

What is the PRIMARY reason for conducting regular drills and training related to the emergency response plan?

<p>To familiarize personnel with the plan, ensuring they can act effectively without hesitation. (C)</p> Signup and view all the answers

Describe a scenario where 'keeping fuel sources and ignition sources separate' would prevent a fire in the workplace.

<p>Storing flammable liquids away from potential ignition sources like heat-producing equipment or open flames prevents the fuel from igniting, thereby preventing a fire.</p> Signup and view all the answers

Which of the following is the MOST critical element in ensuring the effectiveness of an emergency response plan?

<p>The level of participation and understanding among all personnel. (C)</p> Signup and view all the answers

Which of the following strategies is the MOST effective for minimizing harm to individuals in the workplace from fire hazards?

<p>Implementing a dynamic assessment policy that includes preplanning for new processes and working practices, alongside appropriate control measures. (A)</p> Signup and view all the answers

Areas classified as 'normal risk' are those where highly flammable materials are stored, requiring immediate evacuation upon fire detection.

<p>False (B)</p> Signup and view all the answers

In the context of fire risk assessment, what is the primary difference between 'normal risk' and 'high risk' areas, and how does this difference impact evacuation strategies?

<p>The primary difference lies in the speed of fire development and the available evacuation time; high-risk areas necessitate quicker evacuation strategies due to rapid fire spread.</p> Signup and view all the answers

A key component of a dynamic assessment for fire hazards is preplanning when introducing new processes or working practices, ensuring that appropriate ______ measures are put in place.

<p>control</p> Signup and view all the answers

Match each risk reduction strategy to its description:

<p>Removing the hazard altogether = Eliminating the source of the risk to prevent any possibility of harm. Reducing the hazard = Lowering the degree of danger to minimize the potential for fire. Replacing the hazard = Substituting a dangerous material or process with a safer alternative. Segregating the hazard = Isolating the risk to prevent it from affecting other areas or people.</p> Signup and view all the answers

During a fire risk assessment, which factor primarily determines whether an area is classified as 'high risk'?

<p>The speed at which a fire can develop, reducing available evacuation time. (A)</p> Signup and view all the answers

Maintaining detailed records of fire risk assessments is only necessary in workplaces that store highly flammable materials.

<p>False (B)</p> Signup and view all the answers

What specific information should be included in the findings of a fire risk assessment to ensure comprehensive documentation and facilitate effective follow-up actions?

<p>The date of assessment, identified hazards, staff especially at risk, actions needed with deadlines, and overall conclusions should all be included in the assessment.</p> Signup and view all the answers

Why is foam not used on electrical fires?

<p>AFFF contains water and can conduct electricity, posing a risk of shock. (B)</p> Signup and view all the answers

Vaporizing liquid extinguishers are suitable for use on Class A fires but not on Class E fires due to the risk of electrical conductivity.

<p>False (B)</p> Signup and view all the answers

Describe the primary mechanism by which vaporizing liquid extinguishers extinguish fires.

<p>Smothering and cooling</p> Signup and view all the answers

Wet chemical extinguishers react with cooking oils and fats to form a soap-like solution, sealing the surface and preventing ______.

<p>re-ignition</p> Signup and view all the answers

Match the extinguisher type with its appropriate use:

<p>Foam Extinguisher = Class A and B fires Wet Chemical Extinguisher = Class F fires involving cooking oils and fats Vaporizing Liquid Extinguisher = Class E (electrical) fires</p> Signup and view all the answers

Which extinguishing agent was banned in 1994 due to its ozone-depleting properties?

<p>Bromochlorodifluoromethane (CF2ClBr; Halon 1211/BCF) (D)</p> Signup and view all the answers

Foam extinguishers are ideal for fires involving solvents such as alcohol and acetone without requiring any special type of foam.

<p>False (B)</p> Signup and view all the answers

What is the key advantage of using Halotron in areas with sensitive electronic equipment?

<p>Leaves no residue and is electrically nonconductive</p> Signup and view all the answers

Which scenario poses the MOST significant fire risk due to a combination of factors?

<p>A facility with poor housekeeping practices where combustible waste accumulates near potential ignition sources and where staff are not trained. (D)</p> Signup and view all the answers

Fire risk assessments primarily focus on preventing fires rather than on strategies for managing them once they have started.

<p>False (B)</p> Signup and view all the answers

Explain how the absence of regular fire drills can increase the likelihood of injuries or fatalities during a workplace fire.

<p>Without regular fire drills, occupants may not be familiar with evacuation routes and procedures, may not react quickly or effectively, and could result in confusion and/or panic.</p> Signup and view all the answers

The primary purpose of a fire certificate is to verify that a premise meets specified ______ and ______ requirements.

<p>fire, safety</p> Signup and view all the answers

Match each fire safety management activity to its primary objective.

<p>Maintenance of clear escape routes and exit doors = Ensuring quick and safe evacuation Management of waste and rubbish = Reducing fuel load and ignition risks Provision of information and training = Increasing awareness and preparedness Appointment of fire marshals = Coordinating emergency response</p> Signup and view all the answers

What is the MOST critical reason for employers to conduct fire risk assessments?

<p>To protect the health and safety of employees and other occupants. (D)</p> Signup and view all the answers

Maintaining security procedures to prevent combustible materials from being stored next to buildings is primarily aimed at preventing arson attempts.

<p>False (B)</p> Signup and view all the answers

Explain how inadequate ventilation can contribute to an increased risk of fire in an industrial setting.

<p>Inadequate ventilation allows flammable vapors and combustible dust to accumulate, creating a potentially explosive atmosphere that can easily be ignited by a spark or heat source.</p> Signup and view all the answers

In what scenario would using a dry powder extinguisher potentially cause more harm than the fire itself?

<p>When used on electrical fires in areas with sensitive electronic equipment like a server room. (A)</p> Signup and view all the answers

A fire blanket is designed to extinguish fires by chemically reacting with the burning material to neutralize it.

<p>False (B)</p> Signup and view all the answers

What does the acronym 'PASS' stand for when referring to the operation of a fire extinguisher?

<p>Pull, Aim, Squeeze, Sweep</p> Signup and view all the answers

When using a foam extinguisher on a burning liquid, you should spray the foam against a ______ wall to allow it to spread over the fire.

<p>backing</p> Signup and view all the answers

Match the action with its respective step in fire extinguisher use:

<p>Pull = Release the safety mechanism Aim = Direct the extinguishing agent at the source of the fire Squeeze = Discharge the extinguishing agent Sweep = Apply the agent across the fire's area</p> Signup and view all the answers

Why is it important to give a short burst from a CO2 extinguisher before applying it to a fire?

<p>To clear the nozzle and ensure the extinguisher is working properly. (D)</p> Signup and view all the answers

In the event of a fire, evacuating the building is optional and depends on the perceived severity of the fire.

<p>False (B)</p> Signup and view all the answers

What is the primary objective when fighting a fire, and how does it differ from the objective of evacuation?

<p>The primary objective of fighting the fire is to minimize damage to valuable property. The objective of evacuation is to save lives.</p> Signup and view all the answers

Flashcards

Cotton Overalls (Fire Risk)

Cotton overalls reduce static electricity build-up, lowering spark risk. They smoulder instead of burning, minimizing skin damage.

Synthetic Overalls (Fumes/Vapours)

Synthetic fabrics are preferable as they absorb less. This makes them better when fumes and vapours are present.

Protection Against Absorbent Materials

An overall and acid suit prevents skin absorption of hazardous materials.

Nomex® aramid fibre

Flame-resistant fiber used in protective garments to protect against fire hazards, such as for race car drivers.

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Steel-toed Leather Shoes

Protect toes from falling weights and impacts.

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Rubber Knee-Boots

Protects feet in wet environments.

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Anti-Static Soles

Reduce static electricity build-up, lowering spark risk when working with flammable materials.

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Masks and Respirators

Protects from dust, fumes, and vapours. Always read the instruction label for correct use.

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Emergency Response Plan

Details what to do in an emergency, chain of command, communication procedures, site/building info, and evacuation procedures.

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Emergency Actions

Raise the alarm, stay calm, keep safe first, help if possible, follow instructions, and go to the assembly point.

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Emergency Plan Components

Actions to be taken, emergency contact numbers, and Safety Data Sheets (SDS).

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Fire Triangle

Enough oxygen, enough heat, and fuel/combustible material.

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Fire

A chemical reaction involving rapid oxidation (burning) of a fuel.

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Fire Extinguishers

They remove one or more elements of the fire triangle (oxygen, heat, fuel).

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Basic Fire Safety

Keeping fuel sources and ignition sources separate.

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In an Emergency

Don't panic, rinse off contamination, seek medical assistance.

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Industrial Fire Causes

Fires in industrial settings caused by hazards like faulty equipment, unsafe storage, or human error.

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Fire Hazard Prevention

Knowing company procedures and staying alert to dangerous situations.

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Workplace Fire Safety Plan

Employers train workers, assign key personnel, and create evacuation plans.

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Fire Safety Regulations

Ensuring fire detection and fighting methods, escape routes, and risk assessments.

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Fire Certificate

Document issued by fire authorities certifying a premise meets fire safety standards.

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Fire Safety Management

Security, flammable substance control, ignition source elimination, clear exits, waste management, training, equipment, fire marshals, drills, and alarm systems.

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Fire Risk Assessment

Determines the likelihood of a fire and its potential dangers to people in the workplace.

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Fire Risk Assessment - Steps

The process of determining potential fire risks.

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Fire risk reduction

Reducing fire risks by removing hazards, minimizing their impact, using safer alternatives, isolating hazards & prevention policies.

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Risk classification

Classify areas based on the potential impact of a fire: low, normal, or high.

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Low-risk area

Minimal risk to life, low fire probability, slow spread, ample reaction time.

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Normal-risk area

Most workplaces; fire likely confined/slow spread, effective warning allowing safe escape.

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High-risk area

Area where evacuation time is reduced, like storage of flammables or explosives.

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Assessment findings

Date, hazards, at-risk people, action plan, and conclusions.

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Fire safety action plan

A documented plan detailing actions needed to mitigate identified fire hazards within a specific timeframe.

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Prevention policy and culture

A policy and culture to proactively prevent workplace hazards before they occur.

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Fire Blanket Function

Smothers fire by blocking oxygen. Made of fire-retardant material like woven glass fiber.

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Fire Extinguisher Location Sign

A generic sign indicates its location, facilitating quick identification during a fire.

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Fire Extinguisher Acronym

Pull, Aim, Squeeze, Sweep: The acronym for operating a fire extinguisher effectively.

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Fire Extinguisher Use

Stand 3m away, squeeze handle to discharge, sweep side to side at fire's base.

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AFFF Extinguisher Technique

Spray foam against a backing wall allowing it to spread, smothering the fire.

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Short Burst

Clear the nozzle and ensure it is working correctly.

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CO2 Extinguisher Limitation

Due to the risk of re-ignition after the CO2 dissipates

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Evacuation Purpose

To save lives; therefore, it is mandatory.

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Foam Extinguishers

Suitable for Class A (solids) and Class B (liquids) fires. Use specific techniques based on the burning material.

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Wet Chemical Extinguishers

Apply gently to Class F fires (cooking oils/fats). Creates a soap-like solution to prevent re-ignition. Also suitable for Class A fires.

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Vaporising Liquid Extinguishers

Rapidly evaporating liquid that smothers the fire and cools the area. Formerly contained BCF (Halon 1211). Current types use Halotron.

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Bromochlorodifluoromethane (BCF)

Banned in 1994 due to ozone-depleting properties. Still used aviation.

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Halotron (HCFC)

A 'Clean Agent' used in vaporizing liquid extinguishers, safe for the environment, and electrically nonconductive.

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Clean Agent Properties

Discharged as a rapidly evaporating liquid, leaves no residue, and is electrically nonconductive.

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Halotron Uses

Used in areas formerly protected by BCF, like computer and server rooms, due to its non-residue property.

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Extinguisher Application

Foam: Aim at the base (solids), or edge/surface (liquids). Wet Chemical: Apply gently to prevent splashing. Vaporizing Liquid: Smother the fire.

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