CCO PRACTICE Exam | Questions & 100% Correct Answers (Verified) | Latest Update | Grade A+

When working on rubber, cranes are rated at what percentage of tipping: a) 70% b) 75% c) 80% d) 85% Correct Answer: 75% When a crane is working "on outriggers" the only time they should be less than fully extended is when: a) working alongside the highway and cannot block a lane b) you are handling light loads c) the main boom is being lifted d) there is a load chart for this operation Correct Answer: there is a load chart for this operation A truck crane set up with the outriggers extended and set, and tires touching the ground, the operator should refer to what load chart: 2 a) intermediate chart b) over the front chart c) on rubber chart d) 85% of the main chart Correct Answer: on rubber chart Blocking paced under the ends of crawler tracks will: a) increase the crane's stability when operating over front or back b) increase the crane's stability when operating over side c) stop crane from traveling unexpectedly d)stop crane from sliding unexpectedly Correct Answer: increase the crane's stability when operating over front or back What quadrant produces the least amount of ground pressure on a lattice crawler: a) corner b) side c) front d) rear Correct Answer: side During assembly where should you attach slings to lift boom sections: a) to the top of main chords 3 b) to the top end fittings c) 2 feet from end of section d) center of boom section Correct Answer: to the top end fittings When a lattice boom truck crane is set up on outriggers, the floats or pads should always be: a) large enough to support two times the applied load b) with the tires firmly on the ground c) secured to the outriggers d) placed on the mats Correct Answer: secured to the outriggers A truck crane operating with outriggers fully extended and set, but does not have a front outrigger, the operator should: a) operate over the front with caution b) refer to the manufacturer's working area diagram c) block under the bumper to provide more stability d) only operate over the front at a 50% reduction of the load chart Correct Answer: refer to the manufacturer's working area diagram When a crane is operating on properly set outriggers, the tipping axis is located at the: a) radius of the counterweight 4 b) center pin of the crane c) boom heel pins d) point where the outriggers touch the ground Correct Answer: point where the outriggers touch the ground The purpose of placing mats or cribbing under outrigger floats is to: a) get the tires off the ground b) distribute the downward force of the float over a larger area c) allow the float to be level d) raise the operator's cab for better vision Correct Answer: distribute the downward force of the float over a larger area A crane loses stability when its leverage on the load is: a) less than a load's leverage on the crane b) 70% of the load's leverage on the crane c) 80% of the load's leverage on the crane d) more than the load's leverage on the crane Correct Answer: less than a load's leverage on the crane If a lattice boom truck crane is going to perform work over the front it must have: a) a second signal person stationed over the front of the crane b) a short boom incapable of tipping the crane 5 c) a front mounted counterweight to prevent tipping in that area d) a load chart stating capacities in that area Correct Answer: a load chart stating capacities in that area Each outrigger pad and its blocking should be sufficient to support