NCCER Intermediate Rigging, 3rd Ed
Lattice Boom Assembly & Disassembly
Exam Questions and Answers
Connector pins in pendants should never be removed
a . unless the pendant is under light tension
b . without first removing the pendant from the crane
c . until the proper lubricant has been applied
d . when the pendant is under any tension - Answer-d . when the pendant is under any
tension
Which of the following features is necessary for a crane assembly area ?
a . Soft , sandy soil for cushioning the boom sections
b . Easy entry and egress for transport trucks
c . Gently sloping area for assembling the boom
d . Minimum of 220 VAC electrical service - Answer-b . Easy entry and egress for
transport trucks
Diagonal struts - Answer-In a lattice boom with a rectangular cross section , pieces of
structural pipe or angle iron welded to diagonally opposite chords of the boom to stiffen
the assembly .
Gantry - Answer-A heavy frame with roller sheaves mounted on the upperworks of a
crane , used for providing a mechanical advantage to the boom hoist ropes ; also refers
to a jib strut or mast .
Lattice lacing - Answer-In a lattice boom , the zig - zag pattern of structural metal
supporting the main chords along the sides , top , and bottom of the boom sections .
Main chords - Answer-The heavy structural pipe or angle iron members running the
length of a boom section .
Pendant - Answer-A length of heavy wire rope or flexibly, connected sections of flat
metal bars, equipped with connectors at both ends, used to hoist and/or support
sections of a crane's boom
Suspension rope - Answer-The rope reeved through a crane's gantry and mast sheaves
to the sheaves suspending the boom pendants
Back hitch - Answer-The mechanism that permits, adjusting the position of the boom
gantry to maximize its leverage on the bottom hoist cables
, Belly lines - Answer-Additional pendants attached to the boom hoisting bail, and
secured at a location near the midpoint of a long boom to minimize stagging
Boom stops - Answer-Devices that mechanically prevent the boom from exceeding a
maximum boom angle, reducing the potential for backward tipping or structural damage
Cantilever length - Answer-The length of a horizontal boom that projects beyond the
support of the boom pendants, leaving the portion of the boom, supported at only one
and like a __________________.
Hoist kick - out - Answer-A term for any safety device that automatically stops a hoist
drum when a limit is reached
Live boom mast - Answer-A heavy framework or lattice, boom, with sheaves hinged at
the lower end of its base on the cranes upperworks, whose purpose is to control the
angle of the main boom through attached boom pendants. Boom hoist cables reeved
through the boom gantry sheaves or hydraulic actuators control its position
All the following actions are appropriate when preparing to assemble a lattice boom
except
a . extending and locking outriggers to their maximum extent
b . removing the crawler assemblies
c . erecting the gantry and boom mast rigging
d . extending a crane's extendable counter weight - Answer-b . removing the crawler
assemblies
The maximum cantilever length of a lattice boom is the maximum
a . length of a luffing jib
b . load chart radius of the boom
c . length of a lowered boom beyond the pendants
d . boom length permitted by the manufacturer - Answer-c . length of a lowered boom
beyond the pendants
When installing a jib on a lattice boom , attach ing the jib may require a
a . belly line
b . jib adapter
c . diagonal strut
d. back hitch assembly - Answer-b . jib adapter
Which boom connector pins are removed first during disassembly ?
a . Lower pins
Lattice Boom Assembly & Disassembly
Exam Questions and Answers
Connector pins in pendants should never be removed
a . unless the pendant is under light tension
b . without first removing the pendant from the crane
c . until the proper lubricant has been applied
d . when the pendant is under any tension - Answer-d . when the pendant is under any
tension
Which of the following features is necessary for a crane assembly area ?
a . Soft , sandy soil for cushioning the boom sections
b . Easy entry and egress for transport trucks
c . Gently sloping area for assembling the boom
d . Minimum of 220 VAC electrical service - Answer-b . Easy entry and egress for
transport trucks
Diagonal struts - Answer-In a lattice boom with a rectangular cross section , pieces of
structural pipe or angle iron welded to diagonally opposite chords of the boom to stiffen
the assembly .
Gantry - Answer-A heavy frame with roller sheaves mounted on the upperworks of a
crane , used for providing a mechanical advantage to the boom hoist ropes ; also refers
to a jib strut or mast .
Lattice lacing - Answer-In a lattice boom , the zig - zag pattern of structural metal
supporting the main chords along the sides , top , and bottom of the boom sections .
Main chords - Answer-The heavy structural pipe or angle iron members running the
length of a boom section .
Pendant - Answer-A length of heavy wire rope or flexibly, connected sections of flat
metal bars, equipped with connectors at both ends, used to hoist and/or support
sections of a crane's boom
Suspension rope - Answer-The rope reeved through a crane's gantry and mast sheaves
to the sheaves suspending the boom pendants
Back hitch - Answer-The mechanism that permits, adjusting the position of the boom
gantry to maximize its leverage on the bottom hoist cables
, Belly lines - Answer-Additional pendants attached to the boom hoisting bail, and
secured at a location near the midpoint of a long boom to minimize stagging
Boom stops - Answer-Devices that mechanically prevent the boom from exceeding a
maximum boom angle, reducing the potential for backward tipping or structural damage
Cantilever length - Answer-The length of a horizontal boom that projects beyond the
support of the boom pendants, leaving the portion of the boom, supported at only one
and like a __________________.
Hoist kick - out - Answer-A term for any safety device that automatically stops a hoist
drum when a limit is reached
Live boom mast - Answer-A heavy framework or lattice, boom, with sheaves hinged at
the lower end of its base on the cranes upperworks, whose purpose is to control the
angle of the main boom through attached boom pendants. Boom hoist cables reeved
through the boom gantry sheaves or hydraulic actuators control its position
All the following actions are appropriate when preparing to assemble a lattice boom
except
a . extending and locking outriggers to their maximum extent
b . removing the crawler assemblies
c . erecting the gantry and boom mast rigging
d . extending a crane's extendable counter weight - Answer-b . removing the crawler
assemblies
The maximum cantilever length of a lattice boom is the maximum
a . length of a luffing jib
b . load chart radius of the boom
c . length of a lowered boom beyond the pendants
d . boom length permitted by the manufacturer - Answer-c . length of a lowered boom
beyond the pendants
When installing a jib on a lattice boom , attach ing the jib may require a
a . belly line
b . jib adapter
c . diagonal strut
d. back hitch assembly - Answer-b . jib adapter
Which boom connector pins are removed first during disassembly ?
a . Lower pins
