NFPA 1006 Office Of The Fire Marshal (OFM) Practice Test

With a 4:1 TMA system how much force is necessary to raise a 100-lb load?

25 lbs of force 33 lbs of force 40 lbs of force 100 lbs of force

Correct Answer:

25 lbs of force

Explanation:

Understanding mechanical advantage is what this tests. In a four-to-one system, the arrangement provides a MA of 4, so the force you must apply is one quarter of the load. For a 100-lb load, that’s 100 ÷ 4 = 25 lb under ideal conditions. In practice, friction and other losses can require a bit more effort, but the theoretical minimum is 25 lb.

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