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28 Cards in this Set
- Front
- Back
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Crane configuration includes:
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Reeving, boom length, counterweight, on outriggers, on rubber, extensions or jibs stowed or mounted, offsets, wire rope type or construction
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Capacities above the bold line on the load chart are based on:
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Structural strength
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If replacing the hoist line wire rope on a crane, how do you determine the size or type of
wire rope to use? |
Use Manufacturer’s operator’s manual or load chart
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Net capacity is equal to:
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Gross capacity minus capacity deductions
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The load weight numbers given in a crane load chart indicate the ___________that the
crane can safely lift. |
Gross load
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Which of these conditions will not dramatically affect the values illustrated on load charts?
a. Improper outrigger set up b. Changing radius c. Wind |
none
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If a jib is erected but not being used, it is treated as a deduction from the cranes:
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Gross capacity
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Tipping capacities of crawler cranes are based on what percentage of tipping?
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75%
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In a range diagram, boom length and angle can be used to determine:
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Load radius
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When using load\capacity charts, what does the term “jib angle to ground” refer to?
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Main boom angle minus the jibs offset
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When making a lift on the main boom of an RT, the stowed lattice swing-a-way section:
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Should be considered part of the cranes deductions
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When you change the jib to ground angle from 400 to 300, you have:
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decreased the capacity of the jib.
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A lattice boom truck crane with a 120 ft. boom will be operating at a 42 ft. radius. The load
chart shows an entry indicating 25,000 lbs. at a 40 ft. radius, followed immediately by an entry listing 20,000 lbs. at a 45 ft. radius. What is the crane’s capacity at the 42 ft. radius? |
20,000 lbs
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When using a mobile crane on a barge, the crane’s load capacity chart shall be:
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replaced by a list chart.
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A crane’s jib is offset 150 versus its original 00 offset, but the boom angle remains
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Increases
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If the jib is offset, the crane’s capacity will:
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Reduced
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If a bold line is shown on a load chart, the capacities below the line:
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stability of the crane
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Rough terrain crane capacities are generally greater over the:
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Over the front
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On duty cycle operations, such as pouring concrete, most manufacturers require a crane’s
load chart capacity to be reduced by: |
20%
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A truck crane is set up on outriggers. The part of the load chart governed by stability is
based on what percentage of the crane’s capacity? |
85%
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You plan to pick a load you are told weighs 36,500 lbs. Line pull on the crane you are
operating is 9,000 lbs. How many parts of the line will you need? |
5
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If a jib is erected but not being used to lift the load, you should make a deduction from the
gross capacities listed in the load chart based on: |
the effective weight of the jib
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On a crawler crane, the part of the load chart governed by stability is based on what
percentage of its capacity? |
75%
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When working on rubber, cranes are rated at what percentage of tipping?
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75%
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When operating a crane on a barge, the list chart must be provided by:
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the manufacture
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When operating a mobile crane you inspect your running wire rope at least:
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Daily
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The effect of a loads leverage being greater than the crane’s leverage is:
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Instability
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How does the effective weight of a stowed jib/extension relate to the actual weight of the
jib/extension? |
Lower than the actual weight.
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