CES Industrial & Manual Handling Ergonomics 2

Question 1

What does the 'frequency multiplier' in the NIOSH Lifting Equation adjust for?

Accepted Answer

The number of lifts per minute and duration of the lifting task

Answer

The frequency multiplier reduces the RWL as lifting frequency and task duration increase, accounting for the cumulative metabolic and biomechanical fatigue associated with repeated lifts.

Question 2

Which ergonomic hazard is most associated with using a vibrating power tool for extended periods?

Accepted Answer

Hand-arm vibration syndrome (HAVS) causing vascular and neurological damage

Answer

Prolonged exposure to vibrating hand tools can cause HAVS, characterized by Raynaud's phenomenon (white finger), peripheral neuropathy, and musculoskeletal damage in the hands and arms.

Question 3

In assembly line ergonomics, what does 'cycle time' refer to and why is it important?

Accepted Answer

The time to complete one work cycle, which determines repetition rate and musculoskeletal demand

Answer

Cycle time determines how frequently a worker repeats specific motions; short cycle times mean high repetition rates, increasing cumulative tendon and muscle loading and MSD risk.

Question 4

What is the primary ergonomic concern with a precision grip versus a power grip in industrial tasks?

Accepted Answer

Precision grip requires much higher relative muscle force and causes greater tendon loading for equivalent tasks

Answer

Precision grip uses a smaller contact area and fewer muscles, requiring proportionally greater effort to achieve the same force as power grip, resulting in higher muscle and tendon loading.

Question 5

What is the ergonomic benefit of anti-fatigue mats for workers who stand for prolonged periods?

Accepted Answer

They reduce lower limb fatigue by promoting subtle weight-shifting micro-movements

Answer

Anti-fatigue mats create a slightly unstable surface that encourages continuous micro-movements of leg muscles, improving circulation and reducing static muscle loading from prolonged standing.

CES - Certified Ergonomic Specialist Practice Test

CES - Certified Ergonomic Specialist Practice Test

CES Industrial & Manual Handling Ergonomics 2