IDRL 308 VERIFIED ACCURATE STUDY GUIDE
HRAC - Answers - Hazard recognition, hazard assessment and hazard control
Hazard Recognition - Answers - The systematic task of identifying all hazards present
or potentially present in a workplace. It's always the first step of any HRAC process.
Hazard Assessment - Answers - Workers and employers which of the hazards needs to
be addressed most urgently.
Hazard Control - Answers - The process used to establish preventative and corrective
measures implemented to eliminate or mitigate the effect of the hazard.
Hierarchy of Controls - Answers - A system used to control workplace risks. It's a step
by step approach to eliminating or reducing risks ranking from most effective to least.
Five Controls in Hierarchy of Controls - Answers - 1. Elimination
2. Substitution
3. Engineering Controls
4. Administrative Controls
5. Personal Protective Equipment (PPE)
Elimination - Answers - Removes the hazard from the worksite
Substitution - Answers - Replaces something that produces a hazard with something
that does not.
Engineering Controls - Answers - Modifications to the workplace, equipment, materials
or work processes that reduces workers exposure to hazards.
Administrative Controls - Answers - Changes to work process, policies, training or rules
designed to reduce exposure to hazards.
Personal Protective Equipment (PPE) - Answers - Equipment worn by workers designed
to protect them if they come in contact with hazard.
Physical Hazards - Answers - Noise and vibration, temperature, radiation and
ergonomics.
When is noise harmful to workers? - Answers - Three characteristics affect when noise
becomes a hazard: frequency, duration and loudness. Noise can lead to permanent
hearing loss.
, When does vibration become harmful to workers? - Answers - When a worker comes
into contact with vibration causing energy to be transferred to the worker. There are two
common types of vibration that are important to
OHS: whole body vibration and segmental vibration.
Whole Body Vibration - Answers - When a workers entire body experiences shaking
due to vibration. Can lead to lower spine damage or even internal organ damage.
Segmental Vibration - Answers - When only parts of the body are affected by vibration.
Most common and concerning form is hand-arm vibration.
When does temperature become a hazard? - Answers - When temperature extremes
prevent our bodies from properly self regulating we experience thermal stress.
Temperatures that are too high can cause heat stroke and temperatures that are too
low can cause hypothermia.
Radiation - Answers - Any energy emitted from a source including heat, light, x-rays,
microwaves and more. It is categorized in two forms: ionizing and non-ionizing.
Ionizing Radiation - Answers - Radiation with enough strength to remove electrons from
a molecule as it passes through. The electron loss causes the molecule to become
positively charged (ion) Ex/ X-rays, gamma rays.
Non-ionizing Radiation - Answers - Does not ionize molecules but can have other
affects. Ex/ microwaves, ultraviolet, radio waves.
Ergonomics - Answers - "Fit the job to the worker, not the worker to the job" Ergonomics
seeks to ensure that the design of the work matches the anatomical, physiological and
psychological needs of the worker. A common health affect of ergonomics is repetitive
strain injuries (RSI).
Noise and vibration controls - Answers - Most effective: elimination, substitution or
engineering controls. Most common yet least effective are time restrictions or PPE.
Temperature Controls - Answers - Most effective control is limiting exposure to
hazardous temperatures. Other controls include relocating work, installing
heating/cooling devices, work-rest cycles, preventing working alone and minimizing
manual effort.
Radiation Controls - Answers - Most effective: engineering controls. Other controls
include PPE and substitution.
Ergonomic Controls - Answers - Most effective: engineering controls, administrative
controls.
HRAC - Answers - Hazard recognition, hazard assessment and hazard control
Hazard Recognition - Answers - The systematic task of identifying all hazards present
or potentially present in a workplace. It's always the first step of any HRAC process.
Hazard Assessment - Answers - Workers and employers which of the hazards needs to
be addressed most urgently.
Hazard Control - Answers - The process used to establish preventative and corrective
measures implemented to eliminate or mitigate the effect of the hazard.
Hierarchy of Controls - Answers - A system used to control workplace risks. It's a step
by step approach to eliminating or reducing risks ranking from most effective to least.
Five Controls in Hierarchy of Controls - Answers - 1. Elimination
2. Substitution
3. Engineering Controls
4. Administrative Controls
5. Personal Protective Equipment (PPE)
Elimination - Answers - Removes the hazard from the worksite
Substitution - Answers - Replaces something that produces a hazard with something
that does not.
Engineering Controls - Answers - Modifications to the workplace, equipment, materials
or work processes that reduces workers exposure to hazards.
Administrative Controls - Answers - Changes to work process, policies, training or rules
designed to reduce exposure to hazards.
Personal Protective Equipment (PPE) - Answers - Equipment worn by workers designed
to protect them if they come in contact with hazard.
Physical Hazards - Answers - Noise and vibration, temperature, radiation and
ergonomics.
When is noise harmful to workers? - Answers - Three characteristics affect when noise
becomes a hazard: frequency, duration and loudness. Noise can lead to permanent
hearing loss.
, When does vibration become harmful to workers? - Answers - When a worker comes
into contact with vibration causing energy to be transferred to the worker. There are two
common types of vibration that are important to
OHS: whole body vibration and segmental vibration.
Whole Body Vibration - Answers - When a workers entire body experiences shaking
due to vibration. Can lead to lower spine damage or even internal organ damage.
Segmental Vibration - Answers - When only parts of the body are affected by vibration.
Most common and concerning form is hand-arm vibration.
When does temperature become a hazard? - Answers - When temperature extremes
prevent our bodies from properly self regulating we experience thermal stress.
Temperatures that are too high can cause heat stroke and temperatures that are too
low can cause hypothermia.
Radiation - Answers - Any energy emitted from a source including heat, light, x-rays,
microwaves and more. It is categorized in two forms: ionizing and non-ionizing.
Ionizing Radiation - Answers - Radiation with enough strength to remove electrons from
a molecule as it passes through. The electron loss causes the molecule to become
positively charged (ion) Ex/ X-rays, gamma rays.
Non-ionizing Radiation - Answers - Does not ionize molecules but can have other
affects. Ex/ microwaves, ultraviolet, radio waves.
Ergonomics - Answers - "Fit the job to the worker, not the worker to the job" Ergonomics
seeks to ensure that the design of the work matches the anatomical, physiological and
psychological needs of the worker. A common health affect of ergonomics is repetitive
strain injuries (RSI).
Noise and vibration controls - Answers - Most effective: elimination, substitution or
engineering controls. Most common yet least effective are time restrictions or PPE.
Temperature Controls - Answers - Most effective control is limiting exposure to
hazardous temperatures. Other controls include relocating work, installing
heating/cooling devices, work-rest cycles, preventing working alone and minimizing
manual effort.
Radiation Controls - Answers - Most effective: engineering controls. Other controls
include PPE and substitution.
Ergonomic Controls - Answers - Most effective: engineering controls, administrative
controls.
