SAF Workplace Ergonomics & Health 4

Question 1

Which handle diameter range is generally recommended for power grip tools to minimize forearm muscle fatigue?

Accepted Answer

1.5–2.0 inches (38–51 mm)

Answer

A handle diameter of 1.5–2.0 inches optimizes grip strength and reduces forearm muscle loading for most adult workers using power grips.

Question 2

What is the ergonomic rationale for placing the most frequently used items within the 'primary work zone'?

Accepted Answer

To minimize reach distance and reduce shoulder and trunk loading

Answer

Items in the primary zone (forearm reach) can be accessed without extending the arms or leaning, minimizing biomechanical stress on the shoulders and spine.

Question 3

A worker develops de Quervain's tenosynovitis. Which wrist and thumb movement combination most likely caused this condition?

Accepted Answer

Wrist extension combined with thumb extension and abduction during repetitive tasks

Answer

De Quervain's involves the abductor pollicis longus and extensor pollicis brevis tendons, irritated by repetitive wrist extension and thumb abduction/extension.

Question 4

In the context of office ergonomics, what is 'glare' and how does it contribute to visual fatigue?

Accepted Answer

Reflected or direct light that reduces screen contrast, forcing the eyes to work harder

Answer

Glare reduces the luminance contrast between screen content and background, making the visual system work harder and causing eye strain and fatigue.

Question 5

Which ergonomic intervention is most effective at reducing musculoskeletal risk for assembly-line workers performing overhead tasks?

Accepted Answer

Lowering the work height so tasks are performed at or below shoulder level

Answer

Overhead work is a leading risk factor for shoulder disorders; redesigning the workstation to bring tasks below shoulder level is the most effective engineering control.

(SAF) Safety Assessment Federation Certification Practice Test

(SAF) Safety Assessment Federation Certification Practice Test

SAF Workplace Ergonomics & Health 4