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

Maximum acceptable weight of lift for 75% of men and 75% of women

Answer

Recommended weight limits based on physiological oxygen consumption

Answer

Maximum force limits derived solely from NIOSH biomechanical models

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

Contact stress on the volar forearm

Answer

Rapid finger movements on a keyboard

Answer

Standing on hard floors without anti-fatigue matting

Question 3

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

Accepted Answer

Administrative control

Answer

Engineering control

Answer

Elimination

Answer

Substitution

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

No changes necessary at present

Answer

Further investigation and possible changes soon

Answer

Investigation and changes in the near future

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

Psychological stress from interpersonal conflict at work

Answer

Cumulative strain from repetitive motions over weeks or months

Answer

Vibration transmitted through the whole body from floor or seat

Question 6

An ergonomics program audit should evaluate which of the following elements to confirm program effectiveness?

Accepted Answer

MSD injury and illness rates, near-miss reports, and worker symptom surveys before and after interventions

Answer

Number of workers who attended mandatory safety training unrelated to ergonomics

Answer

Total production output and quality defect rates only

Answer

Frequency of OSHA recordkeeping audits by compliance officers

Question 7

Which vibration metric is used to assess whole-body vibration exposure and is compared against ISO 2631-1 health guidance caution zones?

Accepted Answer

Frequency-weighted root mean square (r.m.s.) acceleration (m/s²)

Answer

Peak acceleration (m/s²)

Answer

Vibration dose value (VDV) in m/s¹·⁷⁵ only

Answer

Crest factor without frequency weighting