Mobile Crane NCCER study guide 2 Questions With Complete Solutions

Mobile Crane NCCER study guide 2 Questions
With Complete Solutions

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? Correct Answers 2
broken wire in 6 rope diameters

All jibs on conventional type crane booms must
have positive stops to prevent their movement of
more than Correct Answers 5 degrees above the
straight line of the jib and boom

As a general rue on tandem crane lifts neither
crane should be loaded greater than what % of net
capacity Correct Answers 75%

As you boom down the leverage of the load on the
crane will Correct Answers Increase

Booms stop limit Correct Answers Angle of boom
at highest postion

Either end of a hoist rope that has to be cut must
be cut by using a Correct Answers Cable cutter

For a truck crane to maintain a margin of safety
against tipping backwards: Correct Answers

, Weight on lift carrier must not be less than 15% of
total crane weight

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? Correct Answers
75%

For supporting rated loads the design factor for live
or running ropes that wind on drums or travel over
sheaves shall not be less than: Correct Answers
3.5

For supporting rated loads the design factor for
rotation resistant rope shall be: Correct Answers 5
or greater

For supporting the boom and working attachments
at recommended travel and transit positions and
boom lengths the design factor for boom pendants
or standing ropes shall not be less than: Correct
Answers 3

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: Correct
Answers 2.4''