2020-2021 Flashcards
The first recorded use of cranes is found in the history of Ancient Greece, around the___century
Fifth
In first century A.D., treadmills were powered by______
Humans
Industrial cranes have____centers of gravity to permit operation in narrow aisles or runways without outriggers.
Low
The entire rotating crane structure the lies above the swing circle is referred to as the ______of the crane.
Upperworks
When a luffing jib is raised or lowered independently of the boom, the crane’s____ is used as the jib hoist.
Auxiliary winch
Carrier mounted telescopic boom cranes are subdivided by the type of____section with which they are equipped
Head
The center of gravity is the point in the object around which it’s weight is______.
Evenly distributed
A mobile crane is stable when it’s leverage on the load is______the load’s leverage on the crane.
Greater than
The leverage the crane exerts on the load changes as it_______.
Swings
Unless otherwise indicated, if the actual boom length falls between the values listed in the load chart, use the gross capacity for the next_______
Longer boom length listed in the chart
On a loaded lattice boom crane, the boom angle is the angle between the____line of the boom and the horizontal
Center
If the actual boom angle falls between the values listed in the load chart, use the gross capacity rating for the next_____
Lower boom angle listed in the chart
Mobile crane main boom load charts indicate where strength factors apply and where stability factors apply by dividing the chart with a heavy solid line or by using_____.
Shaded areas
Asymmetrical reeling of the boom tip will cause___in the boom.
Torsion
When a crane is set up off-level, swinging from the high side to the low side increases the_____.
Operating status
When working on rubber, an operator can overcome outswing by____.
Booming up as the load is lifted
Boom strength is most affected when the wind is from the_____.
Side
Which of the following is NOT one of the key roles that must be known at every crane and Derrick worksite?
Job Stewart
The target levels provided on most machines can be used for the initial leveling, but do not rely on them for precision or final leveling. Which of the following methods should be used instead?
Hoist line or 3’ or 4’ level
Which is the following is a condition for a crane on outriggers properly set for lifting?
The hook is directly above the load’s center of gravity
Joining lengths of wire rope by splicing is______.
Prohibited
Where a wire rope is required to be removed from service, either the equipment (as a whole) or the hoist with that wire rope must be_____, until the wire rope is repaired or replaced.
Tagged-out
Inspect non-rotating (rotation-resistant, non-spin, spin-resistant) wire ropes very carefully because they tend to wear_____.
From the inside out
Which of the following is NOT a potential hazard when assembling and disassembling lattice booms?
Crew members understanding their tasks
Lifting from jibs or boom extensions while____is prohibited by most manufacturers.
On rubber
When disassembling booms and jibs, none of the pins in the pendant are to be removed (partly or completely) when the pendants are in_____.
Tension
The_____must provide an adequately prepared working area for the crane.
Controlling entity
During the erection of a tower crane, it may be necessary________or support the tower depending on its free-standing height.
Guy
When erecting the main jib, place the main jib on timber blocking and place the slings so that the assembly can be hoisted level. Hoist the main jib level with the____and connect it using the proper pins.
Turntable
All tower crane nuts and bolts must be well lubricated, of the correct size and grade, and tightened sufficiently to develop a_______greater than the dynamic loads that will be applied to them
Pre-tension
An ironworker is a part of a crew erecting a tower crane and finds a loose nut on a bolt that had been previously tight. What should the ironworker do?
Install a new nut and bolt
When climbing a tower crane, immediately prior to the climbing operation, the wedges or clamps must be_____to allow for free upward movement of the tower
Released
When dismantling a tower crane, never release any of the tower crane’s_____, bolts, pendants,etc., until the section or component is properly slung and balanced and the total weight is being carried by the other crane or the Derrick.
Pins
Before making a lift with a tower crane, ensure that the load has been properly____and well secured to prevent the movement or dislodgment of any part.
Rigged
Extreme caution should be exercised when traveling with over 50 percent capacity loads as track irregularities will subject to______loads, which must be compensated for by reducing the hook load.
Shock
If the operator becomes aware of a safety problem and needs to communicate with the signal person, the operator must safely stop operations. Operations must not resume until the operator and signal person agree that the problem has been_____.
Resolved
The signal person must have a basic understanding of the equipment operation and limitations, including the crane dynamics involved in swinging and stopping loads and boom deflection from____loads.
Hoisting
Which of the following is NOT a type of Derrick that ironworkers would not work with?
Gantry
For guy derricks, the minimum number of guys must be_____with equal spacing.
6
The mast base must permit the mast to rotate freely when necessary and permit____of the mast without binding.
Deflection
Prior to initial use, new or reinstalled derricks must be tested with no hook load by a competent person to verify proper operation. Complete this statement describing one item that the test must include: lifting and lowering the hook(s) through the full range of____travel
Hook
Derrick tests conducted must be documented and must contain the date, test results, and the name of the_____.
Tester
When using floating cranes, the employer must erect and maintain control lines, warning lines, railings or similar barriers to mark the boundaries of the_____areas.
Hazard
Gantry cranes, bridge cranes, and overhead cranes, are all types of cranes which lift objects by a hoist which is fitted in a hoist trolley and can move_____on a rail or pair of rails fitted under a beam
Horizontally
