quiz today

Question 1

Four grades of hoist chains

Answer 1

Grade 28 General Utility Chain ◦
Grade 43 High Test Chain ◦
Grade 70 Binding Chain ◦
Grade 80 Alloy Steel Chain: The only one used for overhead lifting!

Question 2

rules for rigging safety

Answer 2

1. Know the weight of the load 2. Know the center of gravity of the load. 3. Make load attachment above the center of gravity of the load. 4. Select hitch that will hold and control. 5. Know the rated capacity of slings and hardware 6. Select sling best suited for load. 7. Inspect all rigging before the lift. 8. Protect sling from sharp surfaces. 9. Proper calculation of increased tension caused by sling angles (on all rigging components!). 10. Calculate reductions when using choker hitch.11. Keep personnel clear from lift area. 12. Lift load a few inches then check rigging. 13. Know limitations of all lifting devices used. 14. Lift slowly and stop slowly.

Question 3

hook/load angles

Answer 3

A. Balanced 100% 
B. 1/4 off center 86% 
C. 1/2 off center 80% 
D. 3/4 off center 70% 
E. Point loading 40%

Question 4

Wire rope wear is based on:

Answer 4

1. Loading 2. Bending (# of times) 3. # of use cycles Change in rope diameter is criteria for retirement.

Question 5

What is the load equation?

Answer 5

(Load / Number of legs) X (L / H) = Load each sling leg

Question 6

Estimate the center of gravity

Answer 6

Lift the load just enough to clear the ground. If the hook is not over the center of gravity the hook will travel to the center of gravity