CEA Human Factors Engineering 3

Question 1

A control-display ratio (C/D ratio) that is too high will most likely result in:

Accepted Answer

Sluggish response requiring excessive control movement

Answer

A high C/D ratio means a large control movement produces a small display change, making the system feel sluggish and requiring excessive physical effort for coarse positioning.

Question 2

The 'magical number 7 ± 2' principle, attributed to George Miller, relates to limitations in:

Accepted Answer

Short-term/working memory capacity

Answer

Miller's 1956 paper demonstrated that short-term memory can hold approximately 7 ± 2 chunks of information simultaneously.

Question 3

Which type of human error involves executing the correct plan but performing the wrong action due to habit or inattention?

Accepted Answer

Slip

Answer

A slip occurs when intentions are correct but execution fails, often due to automatic behavior overriding intentional control.

Question 4

The GOMS model in human factors is primarily used to:

Accepted Answer

Predict expert user performance time for cognitive tasks

Answer

GOMS (Goals, Operators, Methods, Selection rules) predicts expert task completion time by modeling the cognitive and motor steps required.

Question 5

Ecological interface design (EID) is specifically intended to help operators:

Accepted Answer

Perceive system constraints and relationships directly from the interface

Answer

EID maps the work domain's physical and functional constraints onto the interface so operators can perceive system state without abstract interpretation.

(CEA) Certified Ergonomics Associate Practice Test

(CEA) Certified Ergonomics Associate Practice Test

CEA Human Factors Engineering 3