NCCCO Lattice Boom General Knowledge
Exam (2026/2027) (PDF) Questions and
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1. A long boom crane working at minimum radius and 3 degrees out of level
will have approximately what percentage loss of capacity?
a) 25%
b) 35%
c) 50%
d) 75%
Correct answer c) 50%
*Expert-Explanation A 3-degree out-of-level condition on a long boom crane at
minimum radius can result in a 50% loss of capacity. This significant reduction
occurs because the crane's stability is severely compromised when the boom is
nearly vertical and the crane is not level. The out-of-level condition shifts the
center of gravity and reduces the crane's resistance to overturning. Operators
must always ensure the crane is properly leveled before operation to maintain
rated capacities. *
2. According to OSHA, jibs must have a positive ________ from backwards
overturning.
a) Lock
b) Stop
c) Cable
d) Counterweight
Correct answer b) Stop
Expert-Explanation OSHA regulations require that jibs have a positive stop to
prevent backwards overturning. This safety device physically prevents the jib
from rotating backwards beyond its designed range, which could cause the jib
to collapse or damage the boom structure. The positive stop is typically a
mechanical block or limit device that engages when the jib reaches its
maximum allowable angle.
3. What chart do you use when operating a crane on a barge?
a) Tipping chart
b) Wind chart
c) Capacity chart
d) List chart
, Correct answer d) List chart
Expert-Explanation When operating a crane on a barge, a list chart must be
used instead of a standard load chart. List charts account for the barge's list
(tilting) and the crane's position relative to the barge's deck. These charts
provide reduced capacities because the floating platform introduces dynamic
forces and instability not present on solid ground. The list angle significantly
affects stability.
4. Mobile cranes on barges shall be physically ________ to the barge.
a) Bolted
b) Welded
c) Attached
d) Chained
Correct answer c) Attached
Expert-Explanation Mobile cranes operating on barges must be physically
attached to the barge to prevent movement or shifting during operation. This
attachment ensures the crane remains in position despite wave action, wind, or
load movement. Attachment methods include bolting, clamping, or other
secure connections that prevent the crane from sliding or tipping relative to the
barge deck.
5. When a crane is properly barricaded, what clearance is required all the way
around 360 degrees between the superstructure and the barricade when swung
360 degrees?
a) 1 foot
b) 2 feet
c) 3 feet
d) 4 feet
Correct answer b) 2 feet
Expert-Explanation OSHA and ASME standards require a minimum clearance of
2 feet between the crane's superstructure and any barricade when the crane
swings a full 360 degrees. This clearance provides a safety zone for personnel
and prevents contact with the barricade during rotation. The barricade must be
placed so that the crane cannot swing into personnel or obstacles.
6. According to ASME B30.5, a fire extinguisher shall have a rating of __________
and shall be available at all operator's stations or cabs of the equipment.
a) 5 BC or higher
b) 10 BC or higher
c) 20 BC or higher
Exam (2026/2027) (PDF) Questions and
Ansẉers with
Expert-Verified Explanation
This Exam contains:
Guarantee passing score
Multiple -Questions and Ansẉers
Expert-Verified Explanation
Verified ẉith trusted textbooks
,───────────────────────────────────────────────────────
─
1. A long boom crane working at minimum radius and 3 degrees out of level
will have approximately what percentage loss of capacity?
a) 25%
b) 35%
c) 50%
d) 75%
Correct answer c) 50%
*Expert-Explanation A 3-degree out-of-level condition on a long boom crane at
minimum radius can result in a 50% loss of capacity. This significant reduction
occurs because the crane's stability is severely compromised when the boom is
nearly vertical and the crane is not level. The out-of-level condition shifts the
center of gravity and reduces the crane's resistance to overturning. Operators
must always ensure the crane is properly leveled before operation to maintain
rated capacities. *
2. According to OSHA, jibs must have a positive ________ from backwards
overturning.
a) Lock
b) Stop
c) Cable
d) Counterweight
Correct answer b) Stop
Expert-Explanation OSHA regulations require that jibs have a positive stop to
prevent backwards overturning. This safety device physically prevents the jib
from rotating backwards beyond its designed range, which could cause the jib
to collapse or damage the boom structure. The positive stop is typically a
mechanical block or limit device that engages when the jib reaches its
maximum allowable angle.
3. What chart do you use when operating a crane on a barge?
a) Tipping chart
b) Wind chart
c) Capacity chart
d) List chart
, Correct answer d) List chart
Expert-Explanation When operating a crane on a barge, a list chart must be
used instead of a standard load chart. List charts account for the barge's list
(tilting) and the crane's position relative to the barge's deck. These charts
provide reduced capacities because the floating platform introduces dynamic
forces and instability not present on solid ground. The list angle significantly
affects stability.
4. Mobile cranes on barges shall be physically ________ to the barge.
a) Bolted
b) Welded
c) Attached
d) Chained
Correct answer c) Attached
Expert-Explanation Mobile cranes operating on barges must be physically
attached to the barge to prevent movement or shifting during operation. This
attachment ensures the crane remains in position despite wave action, wind, or
load movement. Attachment methods include bolting, clamping, or other
secure connections that prevent the crane from sliding or tipping relative to the
barge deck.
5. When a crane is properly barricaded, what clearance is required all the way
around 360 degrees between the superstructure and the barricade when swung
360 degrees?
a) 1 foot
b) 2 feet
c) 3 feet
d) 4 feet
Correct answer b) 2 feet
Expert-Explanation OSHA and ASME standards require a minimum clearance of
2 feet between the crane's superstructure and any barricade when the crane
swings a full 360 degrees. This clearance provides a safety zone for personnel
and prevents contact with the barricade during rotation. The barricade must be
placed so that the crane cannot swing into personnel or obstacles.
6. According to ASME B30.5, a fire extinguisher shall have a rating of __________
and shall be available at all operator's stations or cabs of the equipment.
a) 5 BC or higher
b) 10 BC or higher
c) 20 BC or higher
