SSH Ergonomics & Musculoskeletal Disorder Prevention 3

Question 1

Which Liberty Mutual Manual Materials Handling tables (Snook Tables) are primarily used to determine acceptable weights and forces for ergonomic task design?

Accepted Answer

Psychophysical acceptable weight limits for specified percentages of the working population

Answer

The Snook (Liberty Mutual) Tables are based on psychophysical methodology, providing acceptable force and weight limits for various MMH tasks that a specified percentage of the industrial working population can perform without overstress.

Question 2

Tendinitis of the rotator cuff is most associated with which ergonomic risk factor?

Accepted Answer

Sustained or repeated overhead work above shoulder height

Answer

Sustained or repetitive overhead work requires the rotator cuff muscles to maintain the shoulder in an elevated position, increasing compressive forces on the supraspinatus tendon and raising tendinitis risk.

Question 3

Which ergonomic principle does 'job rotation' represent in the hierarchy of controls?

Accepted Answer

Administrative control

Answer

Job rotation is an administrative control that limits individual exposure duration to a specific ergonomic risk by distributing the cumulative physical load across multiple workers.

Question 4

The RULA (Rapid Upper Limb Assessment) tool assigns a final action level of 4, which requires:

Accepted Answer

Investigation and changes immediately

Answer

A RULA final action level of 4 (score 7+) indicates high-risk postures requiring immediate investigation and corrective action to prevent musculoskeletal injury.

Question 5

Which of the following best describes 'contact stress' as an ergonomic risk factor?

Accepted Answer

Mechanical pressure on soft tissue from hard, sharp, or narrow surfaces

Answer

Contact stress occurs when hard or narrow surfaces exert localized mechanical pressure on soft tissue (e.g., wrist resting on a desk edge), compressing nerves and blood vessels and increasing MSD risk.

SSH - Specialist Safety & Health Certified Practice Test

SSH - Specialist Safety & Health Certified Practice Test

SSH Ergonomics & Musculoskeletal Disorder Prevention 3