NCCCO test #3 CORRECT QUESTIONS & ANSWERS(RATED A+), Exams of Mobile Computing

Download NCCCO test #3 CORRECT QUESTIONS & ANSWERS(RATED A+) and more Exams Mobile Computing in PDF only on Docsity!

NCCCO test #3 CORRECT QUESTIONS & ANSWERS(RATED

A+)

The crane is out of level, you release the swing break, the boom swings downhill, your: - ANSWER Load radius increases Blocking can be placed under the ends of tracks to: - ANSWER Increase the cranes stability when Operating over front or back What quadrant produces the least amount of ground pressure on a lattice crawler: - ANSWER Side On lattice boom crane's fitted with power load Lowering , a heavy load should be lowered by using the: - ANSWER Power Load-lowering feature and the foot break Abruptly stopping a rapid swing on a long-boom mobile crane will produce what major effect? - ANSWER Overturning the crane or collapsing the boom

When you change the jib to ground angle from 40° to 30° you have: - ANSWER Decreased the capacity of the jib A lattice boom truck crane with 120 foot boom will be operating at a 42 foot radius.The load chart shows an entry indicating 25,000 pounds at a 40 foot radius, followed immediately by an entry listing 20,000 pounds at a 45 foot radius.What is the cranes capacity of the 42 foot radius? - ANSWER 20,000 pounds A truck crane operating with outriggers fully extended and set does not have a fifth front outrigger,the operator should: - ANSWER Refer to the manufacturers working area diagram A crane that climbs a 7% grade, 1 mile hill should descend down the hill in : - ANSWER Either fourth or fifth gear A lattice boom truck crane, when set up out of level, will lose the most capacity with? - ANSWER Long boom short radius A device that automatically stops the boom when it nears the maximum angle is the: - ANSWER Boom hoist kick- out When a lattice boom truck crane is operating on properly set outriggers, the tipping access is located at the: - ANSWER Point where the outriggers touch the ground

When the boom handle is released to it center position, which action should be expected? - ANSWER The boom hoist will be held stationary On a lattice boom crawler crane, the main boom length is measured from the: - ANSWER Center of the boom heal pins to the center of the boom tip sheave You can't level your crawler crane: - ANSWER Don't operate crane What affect does having the crawlers retracted have on a crawler crane with a long boom? - ANSWER Decrease in capacity Your crawler crane is on a barge, it is necessary to: - ANSWER Secure the crane to the barge A pin connected lattice boom is being dismantled. After connecting the equalizer (bridal) to the connecting lugs on the boom, which boom connecting pins should be removed first? - ANSWER Lower connecting pins, located at and ahead of the equalizer When installing a pin-connected lattice boom on a mobile crane you should always: - ANSWER Use the boom hoist Pawl to hold the boom

The purpose of placing mats or cribbing under outrigger floats is to: - ANSWER Distribute the downward force of the float over a larger area A crane loses stability when it's leverage on the load is - ANSWER Less than the loads leverage on the crane If a lattice boom truck crane is going to perform work over the front it must have: - ANSWER A front-mounted outrigger Each outrigger pad and it's blocking should be sufficient to support: - ANSWER The total weight of the crane and it's a load How does high wind affect the set up of a crane with a long boom? - ANSWER Introduces side load onto the boom When a lattice boom truck crane that is properly set up with no front outrigger and the boom is positioned over the front, the combine center of gravity of the carrier and upper works will move: - ANSWER Closer to the axis Jib capacities are based on: - ANSWER Structural strength

When making a left on outriggers, the maximum ground-bearing pressure occurs: - ANSWER Over the corner A cranes jib is offset 15° versus its original 0° offset, but the boom angle remains on changed. In this situation, the load radius: - ANSWER Increases Blocking which is not tightly placed my fail at: - ANSWER 50% of design If the jib is offset the crane's capacity will: - ANSWER Be reduced The safest speed of a crane carrying a load is: - ANSWER The manufacturer's speed limit The boom angle indicator indicated: - ANSWER Angle of boom to horizontal When performing a pick-and carry lift with a rough terrain hydraulic crane, which of the following is the most important consideration? - ANSWER Keeping the boom as low as possible with the load close to the ground

In setting up the crane, the operator can extend three outriggers fully and one only halfway out, but all vertical cylinders are down, and floats are on good supports. The operator must: - ANSWER Use the "on rubber" load chart When using a mobile crane on a barge, the cranes load capacity chart shall be: - ANSWER Replaced by a list chart How many broken wires are permitted at the end connection of a pendant before it must be taken out of service?

• ANSWER 1 When personnel platforms are lifted with a telescopic crane: - ANSWER A two block damage prevention system is provided What items can be removed from a carry deck? - ANSWER Boom extension The lever on the far left of most hydraulic cranes is: - ANSWER Boom swing A telescopic crane is equipped with an anti-two block lock-out device. When the device is activated which functions should be disabled? - ANSWER Hoist up, extend out, and lower the boom When transporting a load on the deck of a carrydeck crane, the operator should: - ANSWER Travel with the outriggers partially extended

If high winds are expected and the lattice boom crane must be secured pointing into the wind, then the hook should be: - ANSWER Secured to a solid structure directly below the boom point. When assembling a lattice boom on most crawler cranes using inserts of different lengths, which insert section generally should be closest to the boom foot? - ANSWER 10ft During assembly where should you attach slings to lift boom sections? - ANSWER End fittings Which boom configuration can cause the most hazardous boom side-loading condition? - ANSWER Long boom with a minimum radius When is it safe to handle loads under power lines? - ANSWER The load nor any part of the crane can come closer than regulations allow On a lattice boom truck crane, boom angle is measured between the centerline of the: - ANSWER Loaded boom and the horizontal

When a lattice boom truck crane is lifting on outriggers, the floats or pad should always be: - ANSWER Secured to the outriggers Manufacturer specifications permit only a certain amount of boom to be suspended out past the connection point of the pendants during assembly or disassembly of the boom. The portion of boom that is suspended in this way is called the: - ANSWER Cantilever length When lattice boom is being disassembled or shortened, it is extremely important to: - ANSWER Never touch any pin on any boom section located between pendent attachment points and the crane When crane is in transit and you are required to pass under. 75 KV powerlines, what is osha's minimum required clearance - ANSWER 4 feet If the load is not applied to the vertical part of the boom, it will create what? - ANSWER Side loading What does the outrigger vertical hydraulic cylinder check valve do? - ANSWER Locks cylinder in case of hydraulic failure What chemicals should be avoided when using nylon rigging swings? - ANSWER Acids