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

95th percentile male forward reach

Answer

50th percentile combined population reach

Answer

75th percentile female forward reach

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

The floor to the top of the head while seated

Answer

The floor to the chin while seated

Answer

The seat surface to the acromion process while seated

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

Maximum shoulder extension with the elbow fully locked

Answer

Full arm extension with maximum shoulder rotation in all planes

Answer

Grip strength measurements taken at progressively greater reach distances

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

Sitting height (seat to vertex)

Answer

Hip breadth (seated)

Answer

Thigh clearance height

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

Reducing accommodation percentile targets to control costs

Answer

Designing only to current data with no generational corrections applied

Answer

Using the oldest available database to maintain conservative design estimates

Question 6

Body mass index (BMI) is relevant to ergonomic design primarily because elevated BMI is associated with:

Accepted Answer

Increased soft tissue dimensions that affect clearance requirements, seat width, and support surfaces

Answer

Directly quantifiable increases in musculoskeletal disorder risk from specific postures

Answer

Predictable maximum acceptable load limits for manual material handling tasks

Answer

A direct linear correlation with grip strength across all age groups

Question 7

When designing workstations for a diverse workforce that includes mixed genders and multiple ethnic backgrounds, the most appropriate anthropometric strategy is to:

Accepted Answer

Apply combined-population percentile data spanning the full demographic range of the actual workforce

Answer

Use anthropometric data from the numerically dominant demographic group only

Answer

Design for the 50th percentile male as a universal reference point

Answer

Use the smallest available dataset to apply conservative minimum estimates