CHST Ergonomics and Musculoskeletal Disorder (MSD) Prevention 3

Question 1

Long-term use of jackhammers and chipping guns is most closely associated with which disorder?

Accepted Answer

Hand-arm vibration syndrome (vibration white finger)

Answer

Hand-arm vibration from percussive tools damages blood vessels and nerves in the fingers, causing vibration white finger.

Question 2

For a pair of gloves to be marketed as "anti-vibration," what should they be certified to?

Accepted Answer

ANSI S2.73 / ISO 10819

Answer

ANSI S2.73/ISO 10819 sets the test method for measuring how much vibration a glove transmits to the palm.

Question 3

Which nerve is compressed in carpal tunnel syndrome, which can come from repetitive gripping with bent wrists?

Accepted Answer

Median nerve

Answer

Carpal tunnel syndrome is compression of the median nerve as it passes through the carpal tunnel of the wrist.

Question 4

Whole-body vibration exposure on a construction site is most commonly linked to which equipment operators?

Accepted Answer

Heavy equipment operators such as excavator, loader, and compactor drivers

Answer

Seated operators of mobile equipment get whole-body vibration through the seat, which is linked to low back disorders.

Question 5

Which control most effectively reduces whole-body vibration for a loader operator?

Accepted Answer

Keeping a suspension seat adjusted for the operator's weight and keeping haul roads smooth

Answer

Suspension seats and well-maintained travel surfaces cut the vibration that reaches the operator's spine.

CHST - Construction Health and Safety Technician Practice Test