CPE Anthropometry & Physical Dimensions in Ergonomics 3

Question 1

When a fixed (non-adjustable) horizontal reach distance must be set, which anthropometric reference ensures all users can access the control or object?

Accepted Answer

5th percentile female forward reach

Answer

Reach dimensions should be set to the minimum reach capability (5th percentile female); if the shortest-reaching person can reach it, every larger user will be able to as well.

Question 2

Sitting height is measured as the distance from:

Accepted Answer

The seat surface to the top of the head (vertex) while seated erect

Answer

Sitting height is measured from the seat pan surface to the vertex (top of the head) in an erect seated posture, and is used to determine overhead clearance requirements for seated workspaces.

Question 3

The 'normal working area' or 'zone of convenient reach' in workstation layout design is defined by:

Accepted Answer

Forearm rotation around the stationary elbow with the upper arm hanging naturally

Answer

The normal working area is swept by forearm rotation with the elbow near the body, requiring minimal muscular effort; frequently used items and controls should be placed within this zone.

Question 4

Which body dimension is most critical for determining the maximum appropriate seat pan depth of a chair?

Accepted Answer

Buttock-popliteal length (back of buttock to back of knee)

Answer

Buttock-popliteal length determines the maximum seat depth before the front edge of the seat compresses the back of the thigh, restricting circulation and causing discomfort.

Question 5

When secular trend data indicates a workforce is becoming taller over time, ergonomists should respond by:

Accepted Answer

Using the most recent available anthropometric datasets or applying secular trend correction factors

Answer

Because secular trend causes older datasets to systematically underestimate current population dimensions, ergonomists should use the most recent survey data or apply documented correction factors to older data.

(CPE) Certified Professional Ergonomist Practice Test

(CPE) Certified Professional Ergonomist Practice Test

CPE Anthropometry & Physical Dimensions in Ergonomics 3