CEA Ergonomic Design & Intervention Strategies 3 — Questions and Answers
Question 1: What is the primary goal of a macroergonomic approach to workplace design?
- Optimizing individual tool dimensions
- Aligning organizational systems, culture, and work processes with human capabilities (Correct answer)
- Reducing the cost of personal protective equipment
- Standardizing keyboard and mouse positions
Correct answer: Aligning organizational systems, culture, and work processes with human capabilities
Macroergonomics addresses the broader sociotechnical system, ensuring organizational structures and processes support human performance.
Question 2: A squeeze force measurement of 32 lbs is recorded during a gripping task. According to ergonomic guidelines, this level would most likely be classified as:
- Acceptable for all-day repetitive work
- Light-duty and below intervention threshold
- Moderate to high force requiring evaluation (Correct answer)
- Below the ACGIH action limit
Correct answer: Moderate to high force requiring evaluation
Grip forces above approximately 10 lbs for repetitive tasks are generally considered moderate-to-high risk requiring ergonomic evaluation.
Question 3: Which ergonomic principle does a tilted work surface (angled 10–20°) for assembly tasks primarily address?
- Noise reduction
- Neutral neck and wrist posture (Correct answer)
- Improved lighting uniformity
- Vibration dampening
Correct answer: Neutral neck and wrist posture
A tilted work surface allows workers to see and access parts with a more neutral neck and wrist posture, reducing flexion.
Question 4: In the context of hand tool design, what does 'pinch grip' avoidance primarily prevent?
- Carpal tunnel syndrome
- De Quervain's tenosynovitis and high tendon loading in the thumb (Correct answer)
- Epicondylitis of the elbow
- Shoulder impingement syndrome
Correct answer: De Quervain's tenosynovitis and high tendon loading in the thumb
Pinch grips produce significantly higher tendon forces than power grips and are a primary risk factor for thumb and wrist disorders like De Quervain's.
Question 5: An ergonomist recommends replacing a fixed-height conveyor with a height-adjustable model. This intervention primarily benefits which worker characteristic?
- Workers with prior injury history only
- The range of worker body size variability (anthropometric diversity) (Correct answer)
- Workers who prefer standing over sitting
- Workers assigned to night shifts
Correct answer: The range of worker body size variability (anthropometric diversity)
Height-adjustable equipment accommodates anthropometric variability, ensuring workers of different statures can maintain neutral postures.
Question 6: Which of the following is a key advantage of conducting a proactive (prospective) ergonomic assessment versus a reactive one?
- Proactive assessments require no worker input
- Hazards are identified and controlled before injuries occur (Correct answer)
- Reactive assessments are more expensive
- Proactive assessments satisfy OSHA citation requirements
Correct answer: Hazards are identified and controlled before injuries occur
Proactive assessments identify ergonomic risk factors during design or process planning, preventing injuries before they happen.
Question 7: The concept of 'zone of convenient reach' in workstation design refers to:
- The farthest distance a worker can reach with full arm extension
- The area reachable while maintaining a neutral, non-stretched posture (Correct answer)
- The space below table height used for storage
- The monitor viewing zone determined by focal distance
Correct answer: The area reachable while maintaining a neutral, non-stretched posture
The zone of convenient reach is the area accessible without excessive reach or trunk lean, keeping joints in near-neutral positions.
CEA Ergonomic Design & Intervention Strategies 3
What is the primary goal of a macroergonomic approach to workplace design?