Ergonomic Tool & Equipment Selection Flashcards

Which characteristic of a sit-stand stool (perch stool) makes it more ergonomically appropriate than a standard stool for assembly work?

Answer: It allows a semi-seated hip angle of 120–135°, reducing lumbar disc pressure while keeping hips near standing height

A perch stool's semi-seated posture at 120–135° hip flexion reduces lumbar disc pressure compared to full sitting while maintaining a working height close to standing, suited to lean tasks.

When evaluating headsets for a call center with 8-hour shifts, which specification MOST directly addresses acoustic shock injury risk?

Answer: Acoustic limiting protection that caps output at 118 dB SPL peak per IEC 60268-6

Acoustic limiting circuitry that complies with IEC 60268-6 prevents sudden loud sounds from exceeding safe peak levels, directly protecting workers from acoustic shock.

For selecting a lift assist device for a healthcare worker repositioning patients in bed, which factor MOST determines the device's ergonomic adequacy?

Answer: The device's rated weight capacity meeting or exceeding the patient's weight

If the device's rated capacity does not meet the patient's weight, it cannot safely or fully offload the physical demand — all other features are moot.

A graphic designer reports shoulder abduction when using a standard mouse placed far to the right of the keyboard. The BEST equipment solution is to:

Answer: Switch to a trackball positioned within the keyboard's number pad zone

A trackball positioned within the number pad zone eliminates mouse travel distance, keeping the arm adducted and shoulder in a neutral position.

Which handle trigger design feature MOST reduces index finger fatigue in a spray gun used for 3-hour continuous painting tasks?

Answer: A wide, padded trigger requiring full-width finger wrap

A wide padded trigger distributes force across multiple fingers rather than concentrating it on the index finger, reducing localized fatigue over prolonged spray sessions.

A surgeon selects laparoscopic instruments for a 3-hour procedure. Which handle design principle from ergonomics MOST applies to reduce forearm muscle fatigue?

Answer: Using palm-grip handles aligned with the instrument shaft to eliminate forearm pronation

Palm-grip handles aligned along the shaft axis keep the forearm in a neutral rotation, eliminating the sustained forearm pronation that is the dominant driver of forearm fatigue in laparoscopic surgery.

When selecting floor sweepers for janitorial staff who cover 50,000 sq ft per shift, which ergonomic specification is MOST critical?

Answer: Handle height adjustability to match operators of different statures without trunk flexion

Handle height that matches each operator's stature prevents sustained trunk flexion during sweeping, the primary musculoskeletal risk in high-distance floor-cleaning tasks.