Rigging, Hoisting & Moving — Industrial Mechanic (Millwright) (433A) Practice Questions

Free Rigging, Hoisting & Moving practice questions

1. 1.What is the sling stress formula?

   • A.(L ÷ H × W) ÷ Number of legs✓
   • B.(W × H) ÷ L
   • C.W ÷ Number of slings
   • D.W × angle factor

   Why: Sling stress = (Length ÷ Height × Weight) ÷ Legs. As angle from vertical increases, stress increases dramatically.

2. 2.Correct spacing for wire rope clips?

   • A.4 × rope diameter
   • B.6 × rope diameter✓
   • C.8 × rope diameter
   • D.3 × rope diameter

   Why: Clip spacing = 6 × rope diameter. For 1/2" rope: 6 × 0.5 = 3" between clips.

3. 3.Minimum recommended sling angle from horizontal?

   • A.30°
   • B.45°
   • C.60°✓
   • D.90°

   Why: 60° minimum from horizontal. Below 60°, sling stress spikes and horizontal crushing forces become dangerous.

4. 4.Using come-alongs horizontally — what must be verified?

   • A.Load is painted
   • B.Anchor capacity, pull direction, rated capacity✓
   • C.Only correct size
   • D.3+ workers present

   Why: Verify anchor point capacity, straight-line pull (no side loading), and come-along rated capacity for the task.

5. 5.What is the standard safety factor used for general rigging hardware?

   • A.2:1
   • B.5:1✓
   • C.10:1
   • D.20:1

   Why: General rigging hardware (shackles, hooks, slings) is designed to a 5:1 safety factor between rated capacity and minimum breaking strength.

6. 6.A shackle pin should be:

   • A.Loose enough to spin freely
   • B.Hand-tight and fully seated, moused if a screw pin✓
   • C.Left finger-loose for easy removal
   • D.Replaced with a bolt for extra strength

   Why: Screw pin shackles must have the pin fully seated hand-tight, and moused (wired) if there's any risk of it backing out under vibration.

7. 7.Before a mobile crane lift, checking the load chart requires knowing:

   • A.Only the load weight
   • B.Load weight, radius, boom length/angle, and configuration✓
   • C.Only the crane's make and model
   • D.Only the operator's certification level

   Why: Crane capacity varies with radius, boom length/angle, and configuration (outriggers, counterweight) — all must match the load chart used.

8. 8.Fall protection is generally required to be used:

   • A.Only above 20 feet
   • B.Whenever there is a realistic possibility of a fall causing injury✓
   • C.Only when a supervisor is present
   • D.Only on scaffolding

   Why: General duty requires fall protection wherever a fall hazard with injury potential exists, not just above an arbitrary fixed height.

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