CIH Ergonomics and Biomechanics 4

Question 1

A warehouse worker lifts boxes from floor level 60 times per hour for an 8-hour shift. According to NIOSH guidelines, the frequency multiplier (FM) would be:

Accepted Answer

Substantially reduced, significantly lowering allowable load weight

Answer

High lift frequency (1 lift/minute for 8 hours) results in a low FM, substantially reducing the RWL below the 51-lb load constant.

Question 2

Which measure of work pace is most directly associated with increased carpal tunnel syndrome risk in assembly workers?

Accepted Answer

Wrist repetition rate exceeding 30 cycles per minute

Answer

High wrist repetition rates compress the median nerve through repeated tendon movements within the carpal tunnel.

Question 3

Ergonomic design using the 5th percentile female for minimum reach distance ensures that:

Accepted Answer

The smallest users can reach all required controls

Answer

Designing reach envelopes for the 5th percentile female ensures that the smallest users can access controls without overreaching.

Question 4

Contact stress on the wrist from a hard tool handle edge is classified as which type of ergonomic risk factor?

Accepted Answer

Localized mechanical stress

Answer

Localized mechanical stress (contact stress) occurs when a hard surface compresses soft tissue, impairing blood flow and nerve conduction.

Question 5

The Borg CR10 scale is used in ergonomics primarily to quantify:

Accepted Answer

Perceived exertion or discomfort rating from workers

Answer

The Borg CR10 scale measures subjective perception of physical effort or discomfort, ranging from 0 (nothing at all) to 10 (extremely strong).

CIH - Certified Industrial Hygienist Exam Practice Test

CIH - Certified Industrial Hygienist Exam Practice Test

CIH Ergonomics and Biomechanics 4