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NCCCO mobile crane operator training CORRECT SET
Typology: Exams
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a crane is set up with 3 of its 4 outriggers fully extended and the fourth retracted. Unless the manufactures states otherwise, the capacity of the crane in the configuration will be? - answer โ โ on-rubber chart
a long boom crane at a short radius and out of level by 3 degrees can see a reduction in capacity by as much as? - answer โ โ 50% a multi crane shall require? - answer โ โ critical lift plan, reduction of gross capacity by 25% and one designated person in charge a rated load test shall not exceed_________ of the load chart - answer โ โ 100% A rough terrain crane on outriggers, the ground bearing pressure is greatest? - answer โ โ Over the corner a signal person shall be? - answer โ โ A designated person, tested and qualified According to 29 CFR 1926.1424 what work area must be barricaded? - answer
An employer that is a prime contractor, general contractor, construction manager or any other legal entity which has the overall responsibility for the construction of the project its planning, quality and completion is known as? - answer โ โ Controlling entity An increase in throat opening on a hook by_________ requires hook replacement. - answer โ โ 5% no more than 1/4" as you boom up with a suspended load, the leverage of the load of the crane will: - answer โ โ Decrease Boom length is measured from? - answer โ โ boom hinge pins to the center of the boom tip sheave Chain slings have a design factor of? - answer โ โ 4 to 1
crane stability is based on? - answer โ โ lever principle Cranes should be load tested when? - answer โ โ After modifications Cribbing or mats used for outriggers pads should be__________times the area of the pad? - answer โ โ 3 Define a cantilever boom - answer โ โ The portion of the boom that extends past the point of suspension or support Define Gross Load - answer โ โ The weight of the item to be picked, plus the deductions Define Net capacity - answer โ โ The capacity in the chart, minus the deduction
How many volts are in a kilovolt? - answer โ โ 1000 volts How much blocking must be placed under outrigger floats when needed? - answer โ โ Enough to sustain the load and maintain stability How much weight is an outrigger stabilizer designed to hold? - answer โ โ All the weight of the crane and load how should wire rope be inspected during a frequent or shift inspection? - answer โ โ visually How would you check the boom angle indicator? - answer โ โ Positions the boom at 0 degrees
How would you use power lowering when lowering a heavy load when operating a conventional crane? - answer โ โ Use the power lowering and the brake If a crane's load moment indicator (LMI) malfunctions, the operator should? - answer โ โ Cease crane operations and report the condition to the supervisor If a horn or level indicator safety device is not working what must be done? - answer โ โ Tagged out or removed if a jib is erected but not being used to lift the load, you should make deduction from the gross capacities listed in the load chart based on: - answer โ โ The effective weight of the jib If an anti-two block warning device is broken on the crane, it must be repaired
Load block sheave pitch diameters have a minimum size of? - answer โ โ 16 times the size of the rope diameter Load hoist sheaves and boom tip sheaves shall have pitch diameters not less than _ times the nominal diameter of the rope used? - answer โ โ 18 Man-baskets are covered under which standards - answer โ โ 29 CFR 1926.1431 and ANSI B30. Man-baskets are proof tested to what percentage - answer โ โ 125% Most jib capacities are based on? - answer โ โ Structural Strength
On a conventional crane, if you move the lever on the far right to nuetral, what will happen? - answer โ โ Boom hoist will stop Over what capacity machine requires a load limiting device if it was manufactured after march 2003? - answer โ โ 6000 lbs Per 1926 Subpart CC, which inspection does a competent person perform with the employer maintaining records for the inspection? - answer โ โ Monthly Per ASME B30.5, what size or type of fire extinguisher shall be installed in the cab or at the machinery housing? - answer โ โ 10 BC Per ASME B30.5, when in transit under power lines of 350 KV the minimum clearance is? - answer โ โ 16 ft
the boom angle on a lattice boom crane, is the angle between? - answer โ โ The ground and the centerline of the boom, between the sheaves and the heel pins. the correct measurement of wire rope diameter is: - answer โ โ The largest diameter of a cross section of a wire rope the deflection of a boom will cause the load to? - answer โ โ increase the radius The eyes of wire rope slings used to support personnel platforms shall be fabricated with what? - answer โ โ Thimbles the load chart is matched to the crane by? - answer โ โ serial number
The load hoist drum flange shall be? - answer โ โ 1/2 in or higher over the top layer of rope the load ratings for truck mounted crane on outriggers should not exceed what percentage of tipping? - answer โ โ 85% The operator knows the cranes limits? - answer โ โ By reading the load chart The safe working load for hooks applies only when the load is suspended from? - answer โ โ the bowl of the hook Three short audible signals means? - answer โ โ Back-up To control the drift of the load, the operator should: - answer โ โ keep the boom tip over the load
rope? - answer โ โ 2 broken wires in 6 diameters or 4 in 30 diameters What are the elements of a properly given voice signal? - answer โ โ Function direction, distance and/or speed, function stop What are the minimum number of wraps that must remain on the boom hoist drum when the boom is lowered to the level of the supporting surface according to the ASME B30.5? - answer โ โ 2 what hand signal must always be obeyed? - answer โ โ Stop what is a luffing jib? - answer โ โ a jib whose angle can be changed during operations
What is the amount of diameter reduction that is cause to take a hoist wire rope out of service? - answer โ โ 6% (more than 5 tes) What is the benefit of blocking under the front of the crawler tracks? - answer โ โ Increase stability What is the definition of must or shall when used in legal terms? - answer โ โ Required or mandatory what is the design factor for rotation resistant rope used as a hoist line? - answer โ โ 5: what is the formula to calculate the load angle factor of a sling? - answer โ โ Sling length divided by sling height
What is the order of sling hitch from weakest to strongest? - answer โ โ choker, vertical, basket what is the OSHA standard for cranes in construction industry - answer โ โ 29 CFR 1926.Subpart CC what is the purpose of a boom length indicator? - answer โ โ to provide the actual boom length at the time of use. What is the purpose of a crane load chart? - answer โ โ To indicate maximum crane capacity under every permissible configuration What may occur when hydraulic boom sections are not extended equally? - answer โ โ longer section collapse
what percentage of the crane chart is considered a critical lift? - answer โ โ 75% What possesses the greatest risk for backwards turnover? - answer โ โ Short boom, high angle, over the side what shall be in the operator's cab during crane operations? - answer โ โ load charts what type of glass is required on a mobile crane cab? - answer โ โ Safety What type of rope shall not be used for a boom hoist system on a crawler crane? - answer โ โ Fiber Core What type of test does a crane inspector have to pass? - answer โ โ Written test
