CIEE CIEE Anthropometry & Human Factors 2 — Questions and Answers
Question 1: Which body landmark is most commonly used as a reference height for setting work surface height at standing workstations?
- Top of the shoulder
- Elbow height (Correct answer)
- Hip height
- Wrist crease height
Correct answer: Elbow height
Elbow height is the standard reference point for setting standing work surface height, with light precision tasks slightly above and heavy tasks slightly below elbow height.
Question 2: What is 'clearance anthropometry' and why is it critical in industrial settings?
- The measurement of maximum body dimensions to ensure workers fit through passageways, under equipment, and within confined spaces (Correct answer)
- The reach envelope measured while wearing PPE
- The overhead clearance required for forklifts in warehouses
- A calculation of safe egress time from an emergency exit
Correct answer: The measurement of maximum body dimensions to ensure workers fit through passageways, under equipment, and within confined spaces
Clearance anthropometry uses maximum body breadth, depth, and height dimensions to ensure sufficient space for workers to move safely through, under, or around industrial equipment and structures.
Question 3: How does the use of personal protective equipment (PPE) affect anthropometric design considerations?
- PPE has no effect because it is worn on the outside of the body
- PPE adds bulk and weight that increases effective body dimensions and reduces dexterity, requiring expanded clearances and control sizes (Correct answer)
- PPE always reduces reach envelope so workstations must be made smaller
- PPE only affects foot dimensions for floor surface grip calculations
Correct answer: PPE adds bulk and weight that increases effective body dimensions and reduces dexterity, requiring expanded clearances and control sizes
PPE such as gloves, respirators, and hard hats increases effective body dimensions and can impair grip and dexterity, requiring ergonomists to account for these additions in workstation design.
Question 4: Which principle describes designing for the extremes of the user population rather than the average?
- Universal design
- Percentile accommodation design (Correct answer)
- Inclusive design for extremes
- Population boundary design
Correct answer: Percentile accommodation design
Percentile accommodation design explicitly targets defined population extremes (e.g., 5th and 95th percentiles) rather than the average (50th percentile), which would exclude a large portion of workers.
Question 5: What is 'biomechanical modeling' used for in the CIEE evaluation process?
- Predicting the financial return on ergonomic investments
- Estimating muscle forces, joint moments, and spinal loads during specific work tasks (Correct answer)
- Mapping the frequency of repetitive motions across a shift
- Calculating rest-break schedules based on metabolic rate
Correct answer: Estimating muscle forces, joint moments, and spinal loads during specific work tasks
Biomechanical modeling quantifies internal forces on muscles, joints, and the spine during specific postures and tasks, helping ergonomists identify which tasks exceed safe load thresholds.
Question 6: In seated workstation design, what is the correct relationship between seat height and work surface height?
- Work surface should always be fixed at 29 inches regardless of seat height
- Seat height should be adjusted so elbows are at or just below work surface height when shoulders are relaxed (Correct answer)
- Work surface must be 4 inches above seat pan height
- Seat height should match work surface height for maximum support
Correct answer: Seat height should be adjusted so elbows are at or just below work surface height when shoulders are relaxed
Proper seated ergonomics requires the seat to be positioned so the worker's elbows are approximately at or slightly below the work surface height, allowing the shoulders to remain relaxed and arms supported.
CIEE CIEE Anthropometry & Human Factors 2
Which body landmark is most commonly used as a reference height for setting work surface height at standing workstations?