Study Questions Flashcards
What is the purpose of placing mats or cribbing under outrigger floats?
Distribute the force over larger area
What is the best location for leveling a crane?
Upperworks
Safety factor of running rope is _____.
3.5 to 1
Safety factor of standing rope is ____.
3 to 1
Safety factor of rotation resistant rope is ____.
5 to 1
Safety factor for personnel platforms (other than rotation resistant) is ____.
7 to 1
Safety factor for personnel platforms (rotation resistant rope) is ____.
10 to 1
Sling safety factor is ___.
5 to 1 (chain 4-1)
Strongest to weakest hitches are ____.
Basket, Vertical/Straight line, Choker
Types of hitches are ____.
Basket, Choker, Double Basket, Double Choker
Lower sling angle equals ____.
Greater tension (preferred angle is 60 degrees)
Minimum sling angle is ____.
30 degrees
Lifting beam must be marked with _____.
Manufacturer name, serial number, weight & permitted working load.
Parts of line are ____.
Individual lines supporting the load block
Odd parts end ____.
At the hook
Even parts end ____.
At the boom tip
Minimum wraps on the drum.
2 (3 for fixed cab)
More lays on the drum means _____.
Line pull decreases
Eccentric reeving causes _____.
Side loading on the boom
Synthetic slings must be used when ____.
Handling boom sections
Hooks must be replaced if _____.
Any twist exists, 5% of original opening, or 10% wear throughout the base or throat of hook and eye
After rigging the main hoist line and boom assembly, _____.
Install the book angle indicator
How many randomly broken wires in a lay length must there be on a mobile crane’s hoist line before it should be removed from service?
6
On a mobile crane, how many broken wires are permitted at the end connection of a pendant line before it must be taken out of service?
1
