CES Ergonomic Tools, Equipment & Technology 1 — Questions and Answers
Question 1: Which tool is used to measure joint angles during ergonomic posture assessments?
- Dynamometer
- Luxmeter
- Goniometer (Correct answer)
- Accelerometer
Correct answer: Goniometer
A goniometer measures the angle of a joint in degrees, allowing ergonomists to quantify posture deviations during task observations.
Question 2: Wearable inertial measurement units (IMUs) in ergonomic assessments primarily measure:
- Heart rate variability
- Muscle electrical activity
- Segment orientation and movement kinematics (Correct answer)
- Grip force
Correct answer: Segment orientation and movement kinematics
IMUs contain accelerometers and gyroscopes that track body segment orientation and movement, enabling continuous posture monitoring without a lab.
Question 3: Surface electromyography (sEMG) is used in ergonomics primarily to assess:
- Body temperature during work
- Muscle activation and fatigue (Correct answer)
- Blood pressure changes with exertion
- Eye movement patterns
Correct answer: Muscle activation and fatigue
sEMG records electrical signals from contracting muscles, allowing ergonomists to quantify muscle load, identify overactivation, and monitor fatigue development.
Question 4: A force plate is most useful in an ergonomic evaluation for assessing:
- Grip strength during tool use
- Ground reaction forces and weight distribution during standing or lifting (Correct answer)
- Vibration exposure levels
- Lighting adequacy at a workstation
Correct answer: Ground reaction forces and weight distribution during standing or lifting
Force plates measure the vertical, horizontal, and shear forces exerted through the feet, providing data on balance, weight shift, and postural loading.
Question 5: Sit-stand workstations are most beneficial when they are used:
- In a fully standing mode for 8 hours
- With alternating sitting and standing throughout the day (e.g., 30-min intervals) (Correct answer)
- Only when the worker experiences back pain
- Set to one fixed height for consistency
Correct answer: With alternating sitting and standing throughout the day (e.g., 30-min intervals)
Alternating between sitting and standing at approximately 30-minute intervals prevents prolonged static loading in either posture and improves circulation.
Question 6: Which characteristic of a powered tool most reduces ergonomic risk compared to a manual version?
- Heavier weight for stability
- Elimination of repetitive forceful exertions (Correct answer)
- Louder noise output
- Larger grip diameter
Correct answer: Elimination of repetitive forceful exertions
Powered tools replace repetitive high-force exertions with a motorized mechanism, directly reducing cumulative tendon and muscle loading.
CES Ergonomic Tools, Equipment & Technology 1
Which tool is used to measure joint angles during ergonomic posture assessments?