AEP Biomechanics and Anthropometry 3

Question 1

The 'reach envelope' concept in workstation design refers to:

Accepted Answer

The three-dimensional zone within which a worker can reach comfortably without harmful postures

Answer

The reach envelope defines the three-dimensional space within which a worker can access tools, controls, and materials while maintaining acceptable postures, used to guide optimal placement of work objects.

Question 2

Maintaining a neutral spine posture during lifting is biomechanically advantageous primarily because it:

Accepted Answer

Distributes spinal loads more evenly and reduces localized stress concentrations

Answer

Neutral spine posture distributes compressive, tensile, and shear forces more uniformly across vertebral structures, reducing peak stress concentrations that occur with extreme flexion or extension.

Question 3

In the NIOSH Revised Lifting Equation (1994), the Asymmetry Multiplier (AM) accounts for:

Accepted Answer

The angular displacement of the load from the sagittal (midline) plane

Answer

The Asymmetry Multiplier reduces the Recommended Weight Limit based on the angle between the midsagittal plane and the line connecting the load's horizontal position, penalizing twisting during lifting.

Question 4

According to biomechanical principles, increasing the horizontal distance of a load from the lumbar spine by a factor of two will:

Accepted Answer

Double the moment (torque) that must be countered by back muscles

Answer

Torque equals force times moment arm; doubling the horizontal distance (moment arm) doubles the torque that lumbar extensors must generate, substantially increasing spinal compression forces.

Question 5

Functional anthropometric data is preferred over static data for workstation design because:

Accepted Answer

Functional data captures the actual body dimensions and clearances needed during task performance

Answer

Functional (dynamic) data reflects real-world postures and movements, capturing how body dimensions change during actual task execution, making it more directly applicable to workstation layout decisions.

(AEP) Associate Ergonomics Professional Practice Test

(AEP) Associate Ergonomics Professional Practice Test

AEP Biomechanics and Anthropometry 3