Questions And Answers With Verified

Nccco Lattice Boom General Knowledge Questions And Answers With Verified Solutions Latest Updated

• How much wind speed can a lattice boom crane withstand from the side

while carrying a full rated load and an additional side load?

Answer: 2% of the rated load

• What percentage of capacity governs the stability section of a load chart for

a crawler crane when working in the side quadrant?

Answer: 75%

• What is the most unstable quadrant for a crawler crane?

Answer: Side quadrant

• What type of capacity is indicated on a crane's load chart?

Answer: Static capacity

• What should you do if a crane manufacturer does not allow pick-and-carry

operations?

Answer: Do not perform any pick-and-carry lifts

• What is the main purpose of a crane’s jib or extension?

Answer: To increase reach, allowing higher lifts or up-and-over capabilities

• How does the number of rope layers on a drum affect line pull?

Answer: It decreases the line pull

• Where should slings be attached when handling boom sections?

Answer: At the pin connections at the ends of the top chords

• What effect does placing timber blocking under the tracks of a crawler

crane have?

Answer: It increases stability

• What can happen if a long-boom crane suddenly stops swinging rapidly?

Answer: It may cause the boom to collapse or overturn the crane 1 / 2

• According to B30.10, when should hooks be removed from service?

Answer: When the throat opening exceeds 5% of the original size

• Where is the greatest ground bearing pressure on a crawler crane?

Answer: Over the corners

• In the process of disassembling a long-boom crane, when should the

bottom boom connection pins be removed?

Answer: After the boom is slightly lifted off the ground and pendant lines are

connected at the cantilever point

• When does the manufacturer usually require a crane's load chart to be

adjusted for wind speed?

Answer: At 20 mph wind speed

• What defines the cantilever of a lattice boom crane?

Answer: The boom extending beyond the pendant connections

• What chart is used when operating a crane on a barge?

Answer: List chart

• According to OSHA, what is required to prevent a jib from overturning?

Answer: A positive stop mechanism

• How should mobile cranes be secured when operating on barges?

Answer: They must be physically attached to the barge

• When a crane is properly barricaded, what is the required clearance

between the superstructure and the barricade during a full 360-degree swing?

Answer: 2 feet

• What is the minimum fire extinguisher rating required at crane operator

stations according to ASME B30.5?

Answer: 10 BC or higher

• When assembling a lattice boom crane, which pins should be inserted

first?

Answer: The top pins of the boom sections

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