Manual Material Handling Flashcards
7 cards from real CEA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Manual Material Handling flashcards as text
Which NIOSH equation variable accounts for the horizontal distance of the load from the worker's body at the origin of lift?
Answer: Horizontal multiplier (HM)
The horizontal multiplier (HM) penalizes lifts where the load is far from the body, reducing the recommended weight limit.
A worker lifts a box from floor to shelf height repeatedly. Which body region is at highest risk for musculoskeletal injury during this task?
Answer: Lumbar spine
Floor-to-shelf lifts impose maximum compressive and shear forces on lumbar discs, making the lower back the highest-risk region.
What does the Lifting Index (LI) value of 1.0 indicate under the NIOSH lifting equation?
Answer: The task is at the upper boundary of acceptable risk
An LI of 1.0 means the actual load equals the recommended weight limit, representing the boundary of nominal risk.
Which pushing/pulling metric is considered the most reliable predictor of musculoskeletal disorder risk?
Answer: Peak force at initiation
Peak initial force required to break static friction is the best predictor because it represents maximum musculoskeletal loading during push/pull tasks.
According to ergonomics guidelines, what is the recommended maximum weight for a one-handed carry by an average male worker under ideal conditions?
Answer: 22 lbs
22 lbs (10 kg) is the commonly cited guideline for one-handed carrying to minimize asymmetric spinal loading.
When evaluating a team lift, how should the team lifting capacity generally be calculated compared to individual capacities?
Answer: 80% of the sum of individual capacities
Team lifting efficiency is approximately 80% of the summed individual capacities due to coordination and load-sharing inefficiencies.
Which flooring characteristic most significantly increases the physical demand of pushing a loaded cart?
Answer: High coefficient of friction between floor and cart wheels
High rolling resistance from rough or sticky flooring dramatically increases the push force required, raising musculoskeletal strain.