Mobile Crane Safety questions with verified solutions 2023/2024

Mobile Crane SafetyUnless the manufacturers state otherwise, truck cranes generally have no lifting capacity over which area ? - correct answer The front Working radius is defined as the distance from the : - correct answer Center of Rotation of the crane to the center of gravity of the load. If a bold line is shown on a load chart, the capacities below the line : - correct answer Are based on the stability of the crane Rough terrain crane capacities are generally greater over the : - correct answer Front According to federal requirements, under what conditions is it ok for a person to ride the headache ball ? - correct answer It is never OK A crane which has been idle for a period of less than three months must be given an inspection conforming to the requirements of a : - correct answer Frequent inspection before use A crane which has been idle for a period of more than three months must be given an inspection conforming to the requirements of a : - correct answer Periodic Inspection before use There are two types of wire ropes : - correct answer Rotation Resistant and Non-Rotation resistant wire rope There are two more classifications of these ropes : - correct answer Running and Standing Ropes Ropes that run over sheaves or on drums, e.g. hoist ropes or boom hoist - correct answer Running Rope Ropes that do not move e.g. pendant lines - correct answer Standing Rope Non-rotating rope or non-spin. - correct answer Rotation Resistant What is the Safety Factor for the Rotation Resistant wire Rope. - correct answer 5:1 (unless lifting personnel 10:1 ) When do you Remove Rotation Resistant wire rope from service. - correct answer 1 broken wire in core or 2 broken wire in 6 diameters or 4 broken wire in 30 diameters. What is the Safety Factor for Non-Rotation resistant. - correct answer 3.5:1 (unless lifting personnel 7:1 ) when do you Remove Non-Rotational wire rope from service. - correct answer 1 broken wire in the core or 3 broken wire in on strand in 1 lay, or 6 randomly distributed broken wires in 1 lay. When do you Remove Standing Rope from service. - correct answer 2 broken wires at the end connection or 3 or more away from the end connection. What is spooling - correct answer Wrapping rope around the crane drum Top to top an Bottom to bottom leaving 1/2 '' from drum flange. What is the minimum wrap around remaining on the crane drum when hoisted down. - correct answer 2 Hoist line not evenly distributed across sheaves. Creates side loading on boom or the block to hang uneven. - correct answer Eccentric Reeving Too many parts of line for the lift, adds additional weight and the possibility to run out of rope. - correct answer Excessive Reeving What do you call it when you have enough parts of line to make the lift. - correct answer Sufficient Reeving