CSS CSS - Certified Safety Supervisor Ergonomics and Confined Space Safety Questions and Answers 2 — Questions and Answers
Question 1: A Lifting Index (LI) value greater than what number indicates a high risk of work-related musculoskeletal disorders according to NIOSH?
- 0.5
- 1.0
- 2.0 (Correct answer)
- 3.0
Correct answer: 2.0
A Lifting Index above 3.0 is considered high risk by NIOSH; values above 1.0 represent some elevated risk, but LI > 3.0 demands immediate corrective action.
Question 2: When testing a confined space atmosphere before entry, what is the correct testing sequence?
- Flammability, then oxygen, then toxics
- Oxygen, then flammability, then toxics (Correct answer)
- Toxics, then oxygen, then flammability
- Temperature, then oxygen, then flammability
Correct answer: Oxygen, then flammability, then toxics
OSHA recommends testing oxygen first because flammability sensors are inaccurate in oxygen-deficient conditions, then checking flammability, then toxic contaminants.
Question 3: Which ergonomic intervention is considered an engineering control for reducing musculoskeletal injury risk?
- Rotating job assignments every two hours
- Installing a height-adjustable work surface (Correct answer)
- Training workers on proper lifting technique
- Scheduling additional rest breaks
Correct answer: Installing a height-adjustable work surface
Installing height-adjustable work surfaces is an engineering control that physically modifies the work environment to reduce ergonomic risk.
Question 4: Under OSHA 1910.146, who is authorized to cancel a confined space entry permit?
- Any worker in the space
- The entry supervisor (Correct answer)
- The attendant from outside
- OSHA compliance officer only
Correct answer: The entry supervisor
The entry supervisor has authority to cancel or suspend the permit when unsafe conditions arise or upon completion of entry.
Question 5: Whole-body vibration exposure is most commonly associated with which musculoskeletal condition?
- Carpal tunnel syndrome
- Lower back disorders (Correct answer)
- Rotator cuff tears
- Lateral epicondylitis
Correct answer: Lower back disorders
Whole-body vibration transmitted through seats or floors of vehicles is a recognized risk factor for lower back pain and intervertebral disc disorders.
Question 6: A hot work permit is being issued for welding inside a confined space. Which additional precaution is specifically required compared to an ordinary hot work permit?
- Fire extinguisher placement only
- Continuous atmospheric monitoring and continuous ventilation throughout the work (Correct answer)
- A spotter positioned at the entrance only
- Increased lighting levels inside
Correct answer: Continuous atmospheric monitoring and continuous ventilation throughout the work
Confined space hot work requires continuous ventilation to remove combustible gases and fumes plus continuous atmospheric monitoring because hazards can rapidly accumulate in enclosed areas.
CSS CSS - Certified Safety Supervisor Ergonomics and Confined Space Safety Questions and Answers 2
A Lifting Index (LI) value greater than what number indicates a high risk of work-related musculoskeletal disorders according to NIOSH?