TLL Latest - Questions And Answers

NCCCO Telescopic Boom Crane- Swing Cab TLL Latest - Questions And Answers Graded A+ generated

When a lattice boom truck crane is set up on outriggers, the floats or pads should

always be:

• large enough to support two times the applied load
• with the tires firmly on the ground
• secured to the outriggers
• placed on the mats - secured to the outriggers

A truck crane operating with outriggers fully extended and set, but does not have a front

outrigger, the operator should:

• operate over the front with caution
• refer to the manufacturer's working area diagram
• block under the bumper to provide more stability
• only operate over the front at a 50% reduction of the load chart - refer to the

manufacturer's working area diagram

When a crane is operating on properly set outriggers, the tipping axis is located at the:

• radius of the counterweight
• center pin of the crane
• boom heel pins
• point where the outriggers touch the ground - point where the outriggers touch the

ground

The purpose of placing mats or cribbing under outrigger floats is to:

• get the tires off the ground
• distribute the downward force of the float over a larger area
• allow the float to be level
• raise the operator's cab for better vision - distribute the downward force of the float

over a larger area

A crane loses stability when its leverage on the load is:

• less than a load's leverage on the crane
• 70% of the load's leverage on the crane
• 80% of the load's leverage on the crane
• more than the load's leverage on the crane - less than a load's leverage on the crane

If a lattice boom truck crane is going to perform work over the front it must have:

• a second signal person stationed over the front of the crane
• a short boom incapable of tipping the crane 1 / 2

• a front mounted counterweight to prevent tipping in that area
• a load chart stating capacities in that area - a load chart stating capacities in that area

Each outrigger pad and its blocking should be sufficient to support:

• 85% of the load chart
• the total weight of the crane and its load
• the total weight of the crane and its long boom
• one-half the total weight of the crane and its load - the total weight of the crane and

its load

When a lattice boom truck crane that is properly set up with no front outrigger and the boom is positioned over the front, the combined center of gravity of the carrier and

upperworks will move:

• further from the axis
• closer to the tipping axis
• to the axis of rotation

d)to the middle of the axis - closer to the tipping axis

When working on rubber, cranes are rated at what percentage of tipping:

• 70%
• 75%
• 80%
• 85% - 75%

When a crane is working "on outriggers" the only time they should be less than fully

extended is when:

• working alongside the highway and cannot block a lane
• you are handling light loads
• the main boom is being lifted
• there is a load chart for this operation - there is a load chart for this operation

A truck crane set up with the outriggers extended and set, and tires touching the

ground, the operator should refer to what load chart:

• intermediate chart
• over the front chart
• on rubber chart
• 85% of the main chart - on rubber chart

Blocking paced under the ends of crawler tracks will:

• increase the crane's stability when operating over front or back
• increase the crane's stability when operating over side
• stop crane from traveling unexpectedly

d)stop crane from sliding unexpectedly - increase the crane's stability when operating over front or back

What quadrant produces the least amount of ground pressure on a lattice crawler:

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