MHC Ergonomics & Human Factors 3

Question 1

Which condition describes 'contact stress' as an ergonomic hazard in material handling?

Accepted Answer

Pressure on soft tissue caused by resting against a hard edge or object

Answer

Contact stress occurs when a hard surface or edge presses into soft body tissue, restricting blood flow and nerve function, often seen when wrists rest on sharp workbench edges.

Question 2

What is the ideal vertical height zone for the most ergonomically safe manual lifting?

Accepted Answer

Knuckle height to shoulder height

Answer

Lifting between knuckle height and shoulder height keeps loads close to the body's center of gravity and within a comfortable range, minimizing back and shoulder strain.

Question 3

Which of the following is a primary goal of an ergonomics program in a material handling environment?

Accepted Answer

Reducing worker injury rates while maintaining or improving productivity

Answer

Ergonomics programs aim to match job demands to worker capabilities, reducing injury rates while sustaining or improving operational productivity.

Question 4

Whole-body vibration (WBV) experienced by forklift operators is primarily associated with increased risk of:

Accepted Answer

Lower-back disorders and spinal degeneration

Answer

Prolonged WBV resonates at frequencies that stress the lumbar spine, leading to an elevated risk of lower-back disorders and disc degeneration in forklift operators.

Question 5

Which PPE item is specifically recommended to reduce hand-arm vibration (HAV) exposure when using vibrating material handling tools?

Accepted Answer

Anti-vibration gloves

Answer

Anti-vibration gloves contain padded or gel inserts designed to dampen tool vibration before it reaches the hand and arm, reducing HAV exposure.

(MHC) Material Handling Certification Practice Test

(MHC) Material Handling Certification Practice Test

MHC Ergonomics & Human Factors 3