NCCER Mobile Crane Exam: Questions and Answers for Safe Crane Operation, Exams of Industrial Technology

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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 ---------CORRECT ANSWER-----------------50% Pre-operational inspections are necessary and required: ---------CORRECT 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: ---------CORRECT ANSWER---------- -------2.4'' On a standard running rope, how many broken wires are cause for considering replacement? ---------CORRECT 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? ---------CORRECT 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? ---------CORRECT ANSWER-----------------2 broken wire in 6 rope diameters The lay length of a wire rope is defined as ---------CORRECT ANSWER----------------- Distance of one strand as it makes one revolutions Which of the following signifies the grade of steel used in wire rope? --------- CORRECT ANSWER-----------------XIP (Extra Improved Plow Steel) Which end fitting has the highest efficiency rating? ---------CORRECT ANSWER------- ----------Swaged Sockets Which hitch provides the greatest lifting capacity? ---------CORRECT ANSWER-------- ---------Basket Hitch When placing a shackle on a crane hook the correct procedure is: ---------CORRECT ANSWER-----------------Place the shackle pin in the hook

The dead-end of the wire rope above the wedge socket must extend minimum of 6 times the rope diameter of? ---------CORRECT ANSWER-----------------6'' As you boom down the leverage of the load on the crane will ---------CORRECT ANSWER-----------------Increase One of the most severe effects of being out of level is: ---------CORRECT ANSWER-- ---------------Side load develops in the boom When Anti-two block device is activated what crane function will NOT work? ------ ---CORRECT ANSWER-----------------Boom down What is required of the operator if the load weight is not accurately known? ------- --CORRECT ANSWER-----------------Determine that the load weight does not exceed the crane's capacity before attempting the lift. The distance from the center of rotation to the center line of a freely suspended hoist line is known as the: ---------CORRECT ANSWER-----------------Radius What does two blocking mean ---------CORRECT ANSWER-----------------When the load handling device make contact with the upper sheaves

Us multi part reeving with the load block when: ---------CORRECT ANSWER----------- ------the line pull is less than the load What effect does rapid hoist acceleration have on the crane? ---------CORRECT ANSWER-----------------Produces hook loads greater than the actual load It is not recommended to use slings below_____ angles? ---------CORRECT ANSWER-----------------30 degree To prevents two-blocking the operator must lower the hoist line or lines when performing which functions: ---------CORRECT ANSWER-----------------A. Booming down B. Extending the boom C. Working within the 12 inch minimum of boom tip Either end of a hoist rope that has to be cut must be cut by using a --------- CORRECT ANSWER-----------------Cable cutter

If telescoping boom sections are not equally extended what could possibly happen: ---------CORRECT ANSWER-----------------Possible failure of the longest section To verify that the boom angle indicator is reading properly you should: --------- CORRECT ANSWER-----------------use a level When using wire rope clips to make wire rope slings you should remember to: ---- -----CORRECT ANSWER-----------------never use wire rope clips to make a sling On wheel mounted cranes, braking shall be provided to bring the machine to a stop on level ground within a distance of 32' from a speed of: ---------CORRECT ANSWER-----------------15mph When determining the "gross load" the best method is: ---------CORRECT ANSWER- ----------------Get an accurate load weight and add the rigging By order of strength which is correct ---------CORRECT ANSWER----------------- Basket, Vertical, Choker

Primary purpose for a roster sheave or auxiliary boom point sheave is to: --------- CORRECT ANSWER-----------------Separate the hoist line When the number of layers of rope on a drum increase the : ---------CORRECT ANSWER-----------------Allowable line pull decreases What is the minimum allowable distance from the crane and power lines under 50kV? ---------CORRECT ANSWER-----------------10' In a two crane lift the center of gravity should be ---------CORRECT 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? ---------CORRECT ANSWER------ -----------75% As a general rue on tandem crane lifts neither crane should be loaded greater than what % of net capacity ---------CORRECT ANSWER-----------------75%

RRL ---------CORRECT ANSWER-----------------Right Regular lay Preformed is defined as: ---------CORRECT ANSWER-----------------Rope manufactured so that strands and wire stay together when it is cut tends to stay in the pre-formed shape at the cut ends Which type core provides the maximum flexibility to wire rope? ---------CORRECT ANSWER-----------------Fiber core Eccentric main boom tip reeving casues ---------CORRECT ANSWER----------------- twisting of the boom How many randomly broken wires must there be to remove a running wire rope from service? ---------CORRECT ANSWER----------------- 6 When working near power lines when is a signal person required? --------- CORRECT ANSWER-----------------When crane moves within a booms length of power lines When operating truck cranes what is the most unstable allowable quadrant of operation? ---------CORRECT ANSWER-----------------Side

Tipping capacities of locomotive cranes are based on what % of tipping? --------- CORRECT ANSWER-----------------85% Should the load be applied when determining the proper boom angle? --------- CORRECT ANSWER-----------------YES What type of rope is recommended for a tagline around powerlines --------- CORRECT ANSWER-----------------Polypropylene what does two beeps of the horn indicate to people in the area ---------CORRECT ANSWER-----------------forward Load radius is the distance from the center of gravity of the suspended load to the: ---------CORRECT ANSWER-----------------Center of rotation What is the purpose of using a boom extension? ---------CORRECT ANSWER---------- -------Increase height

How many broken wires must be present in one strand of one lay for running wire rope to be removed from service? ---------CORRECT ANSWER----------------- 3 In a range diagram boom length and angle can be used to determine: --------- CORRECT ANSWER-----------------Load radius When making a multiple crane lift it is important for the operator to understand that ---------CORRECT ANSWER-----------------the weight may increase if the other crane lands the load first Most crane manufacturers reduce the load capacity for duty-cycle operations because ---------CORRECT ANSWER-----------------side loading forces may occur The proper way to calibrate a boom angle indicator is: ---------CORRECT ANSWER-- ---------------using 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? ---------CORRECT ANSWER-----------------1 1/2 times the depth of the excavation

When using cable or nylon spreaders it is important to remember : --------- CORRECT ANSWER-----------------the lower the spreader angle the greater the tension Backward stability is tested with ---------CORRECT ANSWER-----------------Basic 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 ---------CORRECT ANSWER-----------------Tipping Parts of line means ---------CORRECT ANSWER-----------------the number of lines running through the load block If a jib is erected but not being used, it is treated as deduction from the crane's --- ------CORRECT ANSWER-----------------Gross capacity What are most jib capacities based on? ---------CORRECT ANSWER----------------- Structural Jib back lash is how much? ---------CORRECT ANSWER-----------------5 degrees

How many broke wires in one strand in one lay of a wire rope slings will make it necessary to replace the sling? ---------CORRECT ANSWER----------------- 5 What should only be used for a vertical lift? ---------CORRECT ANSWER----------------

• eyebolt How is safe working load affected if the lifting hook is loaded off center? --------- CORRECT ANSWER-----------------it is decreased All domestic wire rope slings have a safety design lifting factor of: ---------CORRECT ANSWER-----------------5 to 1 Before a spreader bar or beam can be used, they must be ---------CORRECT ANSWER-----------------tested and approaved Which of the following will cause kinks in a wire rope sling ---------CORRECT ANSWER-----------------a load without softeners

Crane hooks must not be twisted in excess of ---------CORRECT ANSWER-------------- ---10 degrees How many randomly distributed broken wires in one lay of a wire rope sling will make it necessary to replace the sling ---------CORRECT ANSWER----------------- 10 You are inspecting a wire rope sling, assume that you have the proper tools to check for wear on the sling, what are you looking for to remove a wire rope sling from service? ---------CORRECT ANSWER-----------------wear of 1/3 the diameter of wire rope lifting lugs should be used for straight, vertical lifting only ---------CORRECT ANSWER-----------------True Turnbuckles should be made of cast steel and should not be welded --------- CORRECT ANSWER-----------------False Pulling synthetic slings from under a load will cause ---------CORRECT ANSWER------ -----------stitching to become damaged and must be removed from service