The lattice boom is designed to take winds of up to 20 mph. from the side plus a full rated load, plus a direct side load equal to what percent of the rated load? - ANSWER 2%
The part of the load chart governed by stability is based on what percentage of capacity while a crawler crane is working...
the lattice boom is designed to take winds of up t
the part of the load chart governed by stability i
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NCCCO Lattice Boom General Knowledge correct 100%
The lattice boom is designed to take winds of up to 20 mph. from the side plus a
full rated load, plus a direct side load equal to what percent of the rated load? -
ANSWER 2%
The part of the load chart governed by stability is based on what percentage of
capacity while a crawler crane is working over the side quadrant? - ANSWER A.
75%
The most unstable working quadrant for a crawler crane is the; - ANSWER Side
What type of capacity is listed on a crane load chart? - ANSWER Static
If the manufacture of a particular crane does not specifically permit pick and carry
operations what procedure must be followed during this operation? - ANSWER
Don't make any pick and carry lifts
What is the main purpose of a jib/extension? - ANSWER To extend reach higher or
up and over
When the number of layers of rope on a drum increase the line pull___________.
- ANSWER Decreases
When handling boom sections, the best place for slings to be attached is; -
ANSWER At the pin connections at the ends of the top chords
, Placing timber blocking under the tips of the tracks on a crawler crane will; -
ANSWER Make the crane more stable
What is the major effect of stopping suddenly a rapid swing while operating long
boom crane? - ANSWER Action may cause the crane boom collapse and/or
overturn the crane
According to B30.10 hooks shall be removed from service when the throat
opening exceeds _____ the original throat opening. - ANSWER 5%
On a crawler crane ground bearing pressure is greatest where? - ANSWER Over
the corner
A long boom crane working at minimum radius and 3 degrees out of level will
have a loss of capacity by; - ANSWER 50%
Can rotation resistant rope be used with a swivel? - ANSWER If approved by the
rope's manufacture
When performing duty cycle operations, most manufactures require the crane's
load chart capacity to be reduced by; - ANSWER 20%
Backward stability of a crane is tested with the crane configured; - ANSWER Basic
boom at maximum angle with no load
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