$$Mobile Crane NCCER Study Guide with well answered questions

$$Mobile Crane NCCER Study Guide with well answered questions When determining the "gross load" the best method is: - ANSWERSGet an accurate load weight and add the rigging By order of strength which is correct - ANSWERSBasket, Vertical, Choker Primary purpose for a roster sheave or auxiliary boom point sheave is to: - ANSWERSSeparate the hoist line When the number of layers of rope on a drum increase the : - ANSWERSAllowable line pull decreases What is the minimum allowable distance from the crane and power lines under 50kV? - ANSWERS10' Eccentric main boom tip reeving casues - ANSWERStwisting of the boom How many randomly broken wires must there be to remove a running wire rope from service? - ANSWERS6 When working near power lines when is a signal person required? - ANSWERSWhen crane moves within a booms length of power lines When operating truck cranes what is the most unstable allowable quadrant of operation? - ANSWERSSide Tipping capacities of locomotive cranes are based on what % of tipping? - ANSWERS85% Should the load be applied when determining the proper boom angle? - ANSWERSYES What type of rope is recommended for a tagline around powerlines - ANSWERSPolypropylene what does two beeps of the horn indicate to people in the area - ANSWERSforward Load radius is the distance from the center of gravity of the suspended load to the: - ANSWERSCenter of rotation What is the purpose of using a boom extension? - ANSWERSIncrease height What do a jib and boom ext. have in common - ANSWERSIncrease height What is the minimum design factor required for a right regular lay main boom or auxiliary hoist rope?` - ANSWERS3.5 How does the operator determine if the correct load chart is being used? - ANSWERSMatching 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? - ANSWERSTo be reduced How does the operator verify the LMs boom length or load radius reading? - ANSWERSaccutal 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: - ANSWERS85% tipping How many broken wires must be present in one strand of one lay for running wire rope to be removed from service? - ANSWERS3 In a range diagram boom length and angle can be used to determine: - ANSWERSLoad radius When making a multiple crane lift it is important for the operator to understand that - ANSWERSthe weight may increase if the other crane lands the load first Most crane manufacturers reduce the load capacity for duty-cycle operations because - ANSWERSside loading forces may occur The proper way to calibrate a boom angle indicator is: - ANSWERSusing a level, raise the boom to horizontal and set the indicator at 0 degrees If setting up the crane by a ditch or an excavation, you should stay at least what distance from the edge? - ANSWERS1 1/2 times the depth of the excavation When using cable or nylon spreaders it is important to remember : - ANSWERSthe lower the spreader angle the greater the tension Backward stability is tested with - ANSWERSBasic boom at maximum angle with no load If the rated capacity of the crane is below the solid line or outside the shaded area or has an asterisk next to it this means the capacity is based on - ANSWERSTipping Parts of line means - ANSWERSthe number of lines running through the load block