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20 Cards in this Set
- Front
- Back
This is not a mobile construction crane... |
Gantry |
|
The width between the crawler tracks affects the _______ of a crawler crane. |
Stability |
|
Truck cranes can climb a job site ramp of up to _____ percent grade. |
40 |
|
Rough terrain carriers should travel at speeds of about ____miles per hour or below... |
30 |
|
The boom base of a crane is sometimes called the ______ |
Boom butt |
|
The part of a crane used to balance the load is a _______ |
Counterweight |
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A lattice boom is supported by a network of wire ropes or lines called ______ |
Pendants |
|
Boom torque caused by running the lift line near one side of the boom ________ |
will cause sheave and line wear |
|
The weight bearing capacity of compacted sand and gravel is ___ pounds per square inch |
110 |
|
The weight bearing capacity of cemented sand and gravel is ___ psi |
135 |
|
The weight bearing capacity of compacted clay is ___ psi |
54 |
|
The ground pressure under an outrigger can be much greater than that under a track on similar lifts due to |
the smaller bearing surface |
|
A wheeled crane is considered to be operating on ___ when in a pick and carry mode |
Rubber |
|
A point on an object around which the weight is concentrated is the ____ |
center of gravity |
|
Lifts over the ____ of the crane are not permitted with most truck mounters cranes |
front |
|
The boom angle is the angle between the boom center line and ______ |
horizontal |
|
Dragging a load along the ground will cause ____ |
side loading |
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A critical lift plan must include all of the following except the ____ |
tipping fulcrum |
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Cranes have brakes that can hold ____ times the rated load |
1.5 |
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When loading a crane on a low boy, flat bed trailer, or railroad flat car, carry the boom at a _____ |
low angle and uphill |