Mobile Crane NCCER study guide 2
Exam Questions and Answers
In a two crane lift the center of gravity should be - Answer-Closer to the crane with the
greatest capacity
For rubber-tired cranes working on rubber, the part of the load chart governed by
stability is based on what % of the crane's capacity? - Answer-75%
As a general rue on tandem crane lifts neither crane should be loaded greater than what
% of net capacity - Answer-75%
On long boom cranes, what is the major effect of abruptly stopping a rapid swing? -
Answer-Action may overturn the crane or collapse the boom
The most important thing to remember when performing dual crane lifts is: - Answer-
The cranes should not be loaded beyond 75% of their rated capacity
The total weight of a loaded personnel platform and related rigging shall not exceed
what % of the rated capacity for the radius and configuration of a crane or derrick -
Answer-50%
Pre-operational inspections are necessary and required: - Answer-Enhance cranes
safety by discovering discrepancies prior to operating.
If a crane has to be level to within 1% of grade, the maximum allowable variation in
grade in a horizontal distance of 20' would be: - Answer-2.4''
On a standard running rope, how many broken wires are cause for considering
replacement? - Answer-3 broken wires in one strand in one lay
On a standing rope, how many wires need to be broken at an end connections before
replacing? - Answer-2
According to ASME B30.5, mobile crane standard, how many randomly distributed
broken wires in rotation- resistant- rope is cause for considering replacement of the
rope? - Answer-2 broken wire in 6 rope diameters
The lay length of a wire rope is defined as - Answer-Distance of one strand as it makes
one revolutions
which of the following signifies the grade of steel used in wire rope? - Answer-XIP (Extra
Improved Plow Steel)
Exam Questions and Answers
In a two crane lift the center of gravity should be - Answer-Closer to the crane with the
greatest capacity
For rubber-tired cranes working on rubber, the part of the load chart governed by
stability is based on what % of the crane's capacity? - Answer-75%
As a general rue on tandem crane lifts neither crane should be loaded greater than what
% of net capacity - Answer-75%
On long boom cranes, what is the major effect of abruptly stopping a rapid swing? -
Answer-Action may overturn the crane or collapse the boom
The most important thing to remember when performing dual crane lifts is: - Answer-
The cranes should not be loaded beyond 75% of their rated capacity
The total weight of a loaded personnel platform and related rigging shall not exceed
what % of the rated capacity for the radius and configuration of a crane or derrick -
Answer-50%
Pre-operational inspections are necessary and required: - Answer-Enhance cranes
safety by discovering discrepancies prior to operating.
If a crane has to be level to within 1% of grade, the maximum allowable variation in
grade in a horizontal distance of 20' would be: - Answer-2.4''
On a standard running rope, how many broken wires are cause for considering
replacement? - Answer-3 broken wires in one strand in one lay
On a standing rope, how many wires need to be broken at an end connections before
replacing? - Answer-2
According to ASME B30.5, mobile crane standard, how many randomly distributed
broken wires in rotation- resistant- rope is cause for considering replacement of the
rope? - Answer-2 broken wire in 6 rope diameters
The lay length of a wire rope is defined as - Answer-Distance of one strand as it makes
one revolutions
which of the following signifies the grade of steel used in wire rope? - Answer-XIP (Extra
Improved Plow Steel)
