Safety Trained Supervisor Life Critical Activities 2 — Questions and Answers
Question 1: What are life critical activities in workplace safety?
- Any activity during evacuation
- High-risk work with potential for fatal or life-altering outcomes requiring strict controls (Correct answer)
- Activities only for licensed workers
- Administrative tasks for life insurance
Correct answer: High-risk work with potential for fatal or life-altering outcomes requiring strict controls
Life critical activities have the highest potential for fatal or permanently disabling outcomes.
Includes working at heights, confined spaces, lockout/tagout, hot work, excavation, lifting, energized electrical, hazardous chemicals, driving, and line of fire. Organizations establish non-negotiable rules for these.
Question 2: What is the purpose of a permit-to-work system for life critical activities?
- Lawsuit-protective paperwork
- Formal process verifying all controls are in place and authorized before high-risk work (Correct answer)
- Limiting workers on site
- Union overtime authorization
Correct answer: Formal process verifying all controls are in place and authorized before high-risk work
PTW ensures all controls, isolations, and authorizations are verified before high-risk work begins.
Elements include hazard assessment, control verification, qualified authorization, communication, defined scope and duration, suspension conditions, and formal closure process.
Question 3: Why is energy isolation (lockout/tagout) life critical?
- Electrical energy is the only hazard
- Unexpected energy release during maintenance can cause immediate death (Correct answer)
- LOTO procedures are most time-consuming
- OSHA LOTO fines are highest
Correct answer: Unexpected energy release during maintenance can cause immediate death
Unexpected energization during maintenance can cause immediate death or catastrophic injury.
Energy sources include electrical, mechanical, hydraulic, pneumatic, thermal, chemical, and gravitational. OSHA 29 CFR 1910.147 requires written procedures, locks/tags, zero energy verification, and annual inspections.
Question 4: What atmospheric testing is required before confined space entry?
- Only oxygen
- Oxygen, flammable gases, and toxic contaminants in that order (Correct answer)
- Optional if space appears ventilated
- Only carbon monoxide
Correct answer: Oxygen, flammable gases, and toxic contaminants in that order
Testing must check oxygen, flammables, then toxics in that specific sequence.
Oxygen first (19.5 to 23.5 percent), flammables second (below 10 percent LEL), toxics third (below PELs). Testing must include stratified levels and be continuous during entry when conditions may change.
Question 5: What is a hot work permit?
- Only for temperatures above 100 degrees
- Required before any work producing sparks, flames, or heat sufficient to ignite nearby materials (Correct answer)
- For working near hot pipes
- Summer overtime authorization
Correct answer: Required before any work producing sparks, flames, or heat sufficient to ignite nearby materials
Required before operations producing sparks, flames, or heat that could ignite nearby materials.
Includes welding, cutting, brazing, grinding, and open flames. Requires fire watch for 30-plus minutes after, clearing combustibles within 35 feet, atmosphere testing, and fire suppression availability.
Question 6: What is the line of fire concept?
- Path of fire during evacuation
- Zone where a worker is in the path of moving objects, released energy, or hazardous materials (Correct answer)
- Boundary around a fire scene
- Electrical supply to fire alarms
Correct answer: Zone where a worker is in the path of moving objects, released energy, or hazardous materials
Line of fire is the danger zone where a worker could be struck by moving objects or released energy.
Common exposures include below suspended loads, in vehicle paths, within swing radius, in front of pressurized connections, in debris trajectory, and between fixed and moving objects.
Safety Trained Supervisor Life Critical Activities 2
What are life critical activities in workplace safety?