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Mobile Crane NCCER Study Guide – Complete With Answers
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Mobile Crane NCCER Study Guide – Complete WithAnswers
When determining the "gross load" the best method is: Correct Ans -
Get an accurate load weight and add the rigging
By order of strength which is correct Correct Ans - Basket, Vertical,
Choker
Primary purpose for a roster sheave or auxiliary boom point sheave is to:
Correct Ans - Separate the hoist line
When the number of layers of rope on a drum increase the : Correct
Ans - Allowable line pull decreases
What is the minimum allowable distance from the crane and power lines
under 50kV? Correct Ans - 10'
Eccentric main boom tip reeving casues Correct Ans - twisting of
the boom
How many randomly broken wires must there be to remove a running wire
rope from service? Correct Ans - 6
When working near power lines when is a signal person required?
Correct Ans - When crane moves within a booms length of power lines
When operating truck cranes what is the most unstable allowable quadrant
of operation? Correct Ans - Side
Tipping capacities of locomotive cranes are based on what % of tipping?
Correct Ans - 85%
Should the load be applied when determining the proper boom angle?
Correct Ans - YES
What type of rope is recommended for a tagline around powerlines
Correct Ans - Polypropylene
, what does two beeps of the horn indicate to people in the area Correct
Ans - forward
Load radius is the distance from the center of gravity of the suspended load
to the: Correct Ans - Center of rotation
What is the purpose of using a boom extension? Correct Ans -
Increase height
What do a jib and boom ext. have in common Correct Ans - Increase
height
What is the minimum design factor required for a right regular lay main
boom or auxiliary hoist rope?` Correct Ans - 3.5
How does the operator determine if the correct load chart is being used?
Correct Ans - Matching serial numbers
If the crane's jib is offset 5 degrees as opposed to an original 15 degrees
and the boom angle remains constant you would expect the load radius to
do what? Correct Ans - To be reduced
How does the operator verify the LMs boom length or load radius reading?
Correct Ans - accutal measurements
If the rated capacity of the crane is above the solid line or within the
shaded areas or has an asterisk next to it this means the capacity is based
on: Correct Ans - 85% tipping
How many broken wires must be present in one strand of one lay for
running wire rope to be removed from service? Correct Ans - 3
In a range diagram boom length and angle can be used to determine:
Correct Ans - Load radius
When making a multiple crane lift it is important for the operator to
understand that Correct Ans - the weight may increase if the other
crane lands the load first
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