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A comprehensive set of questions and answers related to the nccco tower crane exam 7.2024. It covers various aspects of tower crane operation, including erection, dismantling, safety procedures, load capacity, and maintenance. A valuable resource for individuals preparing for the nccco tower crane exam.
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When tower crane is erected/dismantled, written instructions must be - ANSWER On site Tower crane erection/dismantling shall be performed under direct supervision of the - ANSWER Designated person What is the minimum clearance from obstruction when the tower crane freely rotates 360•? - ANSWER 6 ft 6 in What must the crane operator do when a load is suspended - ANSWER Remain at the controls How often should the hoist rope be lubricated? - ANSWER Every 200 hours If block is twisted, it may be necessary to fix the ______________ and make a few empty runs with the hook and trolley and then reopen - ANSWER Twist compensator How many wraps shall be on the drum when the block is at its lowest point - ANSWER 3
The radius on a crane chart refers to - ANSWER Center of rotation to center of gravity of load or hook What would cal for a running rope to be taken out of service - ANSWER 12 randomly distributed broken wires in one lay or 4 in one strand in one lay maintainence personnel are only permitted to operate crane when - ANSWER Only when performing the maintenance duties Crane must be a minimum of ____ away from power lines up to 50kV - ANSWER 10ft How do you determine the size or the mats/blocking needed under tower crane outriggers? - ANSWER Ground bearing capacity of The supporting surface Where shall a fire extinguisher , with a minimum 10ABC classification be installed on a tower crane? - ANSWER In the cab or at the machinery housing Where should tools be kept on a crane when they are not being used? - ANSWER Toolbox List 2 functions that increase the load radius - ANSWER Trolley out and swing Which item below weighs 490 pounds per cubic foot? - ANSWER Steel
Net capacity is determined by - ANSWER Gross capacity minus all deductions A crane should always be barricaded within - ANSWER The outermost swing radius of the rear of the superstructure ( counterweight) The crane must have a _________ inspection performed both monthly and yearly. This information must be documented by the employer that conducts the inspection. - ANSWER Periodic What is the weight of steel per cubic foot? - ANSWER 490 lbs If radius is in between On load chart, you should use - ANSWER Next longer radius If the boom angle is in between On The load chart , you should - ANSWER Use next lower boom angle Wind blowing on the job site can cause: - ANSWER Increase radius and lower tower crane capacity In most cases tower crane operations should be shut down with winds in excess of
On a self-erecting tower crane , which of the following is included in the erection process? - ANSWER Unfolding What should be done if the radio remote is left unattended - ANSWER De-energize crane and remove key or place control in a lock box If the operator is qualified to operate the self erecting tower crane , he can also erect and dismantle the crane - ANSWER False When Tower crane can reach prohibited zone of power lines , what must be done