License Practice Test Part 1 Flashcards
(39 cards)
What is the % of capacity of a triple chain compared to two legs?
an additional 50%
Define the mechanical advantage of the block to the winch
The SWL increases equal to parts added
What are the broken wire removal criteria for rotation resistant wire rope
2 random broken wires in 6 rope diameters, or 4 randomly broken wires in 30 diameters
What is rope lay length
The length of a stand to make one full revolution
Define fleet angle
The angle between a line drawn from the boom tip sheave to the ground, then a second line drawn from the boom tip sheave to the outer most flange point of the drum. 1.5 degrees smooth 2.0 degrees grooved
What are they wear criteria for taking wire rope out of service?
1/3 wear of the outside diameter of original dimension
4 types of cranes
Crawler mounted
Carrier mounted
Rough terrain
All terrain
Give two reasons why one crane in a two crane pick would intentionally be given more weight.
Offset center of gravity
Odd shaped load
One crane has higher capacity
Tripping
Give two causes of the majority of crane accidents.
Improper placement
Improper set up
What type of bolt is used for angular lifts
Shouldered eye bolt
The rule of thumb is that all sheaves should have a D/d ratio of?
20:1
What is overhaul weight
The weight needed to pull the line off the drum
What is the efficiency for Flemish eye
90%
What is the termination efficiency of a wedge socket?
80%
Being off level results in?
Inaccurate radius
Invalid load chart
Uncontrolled swing
Tipping
Wire rope sling capacities
Single leg %
Single choker %
2 leg vertical %
Single leg 100%
Single choker 75%
2 leg vertical 200%
Minimum D/d ratio
Boom hoist sheaves
Boom tip sheaves
Hoist block sheaves
Boom hoist 15/1
Boom tip 18/1
Hoist block 16/1
What are 7 of the rejection criteria per ASME B-30.9 for chain slings?
10% wear, 5% stretch, weld splatter, twists, gouges, excessive nicks, kinks,
Lack to hinge
What is the allowable throat opening on a hook due to wear off the original dimension?
5% or 1/4” of the throat opening
ANSI-B30.5, OSHA-1926 sub part cc standard refers to?
Cranes and derricks in construction
5 things to look for when inspection wire rope
Electrical contact damage
Crushing
Bird caging
Core protrusion
Wear
Kinking
What are the broken wire removal criteria for wire rope terminations?
No more than 1 broken wire in 1 rope diameter at termination
No more than two broken wires beyond the end fitting
List 3 basic functions of blocks
Change of direction
Change of speed
Increase PLP
What are 4 causes of bird caging?
Sudden stops
Shock loading
Pulling through tight sheaves
Wound to tight on drum
