Exam (elaborations)
NCCCO LATTICE BOOM CRAWLER CRANE
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NCCCO LATTICE BOOM CRAWLER CRANE
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NCCCO LATTICE BOOM CRAWLER CRANEOn a lattice boom crawler crane, the main boom length is measured from the . -
ANSWER Center of the boom heel pins to the center of the boom tip sheave.
What is the main purpose of mid point suspension pendants? - ANSWER To absorb
the shock that comes with dynamic loading.
The main purpose of a gantry or a mast on a crane is: - ANSWER To increase the
crane's leverage on the boom.
What effect does having the crawlers retracted have on a crawler crane with long
boom? - ANSWER Increase the probability of tipping.
When using a mobile crane on a barge, the crane's load capacity chart shall be -
ANSWER Replaced by a list chart
Blocking can be placed under the ends of tracks to - ANSWER Increase the crane's
stability when operating over the front or back.
A crawler crane is based on ________ stability of static load. - ANSWER 75%
What quadrant produces the least amount of ground pressure on a lattice crawler -
ANSWER Side
When a crawler crane is on a barge, the list chart must be provided by the -
ANSWER Manufacturer
When operating a crawler crane, the ground pressure will always be highest over the
- ANSWER Corner
Unless working in loose soft soil, a crawler crane should always travel ____ on pick
and carry operations. - ANSWER Towards the load.
Why use mats of cribbing? - ANSWER To reduce ground pressure.
Mats are usually _____ to hold together. - ANSWER Bolted
A crawler crane traveling forward is defined as traveling in the direction of -
ANSWER The idler
When disassembling or assembling booms on lattice boom cranes, it is extremely
important to - ANSWER Never touch any pin on any boom section located between
the pendant attachment points and the crane.
A crane with a 100 foot boom will be operating at a 41-ft. radius. The load chart
shows an entry indicating 25,000 lbs. at a 40-ft radius. What is the crane's capacity
at the 41 ft. radius. - ANSWER 21000 lbs.
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