Mobile Crane Questions Test 3 | 100% Correct Answers | Verified | Latest 2024 Version, Exams of Engineering

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Mobile Crane Questions Test 3 | 100% Correct

Answers | Verified | Latest 2024 Version

The crane is out of level, you release the swing brake, the boom swings downhill, your: - ✔✔Load radius increases. Blocking can be placed under the ends of tracks to: - ✔✔Increase the crane's stability when operating over the front or back. What quadrant produces the least amount of ground pressure on a lattice crawler? - ✔✔Side. On lattice boom cranes fitted with power load lowering, a heavy load should be lowered by using the: - ✔✔Powerload-lowering feature and the foot brake. Abruptly stopping a rapid swing on a long boom mobile crane will produce what major effect? - ✔✔Overturning the crane or collapsing the boom. When the boom handle is released to its center position, which action should be expected? - ✔✔The boom hoist will be held stationary. On a lattice boom crawler crane, the main boom length is measured from the: - ✔✔Center of the boom heel pins to the center of the boom tip sheave. You can't level your crawler crane: - ✔✔Don't operate the crane. What effect does having the crawlers retracted have on a crawler crane with a long boom? - ✔✔Decrease in capacity. Your crawler crane is on a barge, it is necessary to: - ✔✔Secure the crane to the barge. A pin-connected lattice boom is being dismantled. After connecting the equalizer (bridle) to the connecting lugs on the boom, which boom connecting pins should be removed first? - ✔✔Lower connection pins, located at and ahead of the equalizer.

When using a mobile crane on a barge, the crane's load capacity chart shall be: - ✔✔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? - ✔✔1. If high winds are expected and the lattice boom crane must be secured pointing into the wind, then the hook should be: - ✔✔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? - ✔✔10 ft. During assembly, where should you attach slings to lift boom sections? - ✔✔End fittings. Which boom configuration can cause the most hazardous boom side-loading condition? - ✔✔Long boom with minimum radius. When is it safe to handle loads under power lines? - ✔✔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 center-line of the: - ✔✔Loaded boom and the horizontal. When a lattice boom truck crane is lifting on outriggers, the floats or pads should always be: - ✔✔Secured to the outriggers. Manufacturer specifications permit only a certain amount of boom to be suspended out past the connections point of the pendants during assembly or disassembly of the boom. The portion of boom that is suspended in this way is called the: - ✔✔Cantilever length. When lattice boom is being disassembled or shortened, it is extremely important to: - ✔✔Never touch any pin on any boom section located between the pendant attachment points and the crane.

When installing a pin-connected lattice boom on a mobile crane you should always: - ✔✔Use the boom hoist pawl to hold the boom. When you change the jib to ground angle from 40º to 30º, you have: - ✔✔Decreased the capacity of the jib. A lattice boom truck crane with 120 ft. boom will be operating at 42 ft. radius. The load chart shows an entry indicating 25,000 lbs., at a 40 ft. radius, followed immediately by an entry listing 20,000 lbs., at 45 ft. radius. What is the crane's capacity at the 42 ft. radius? - ✔✔20,000 lbs. A truck crane operating with outriggers fully extended and set, does not have a fifth front outrigger, the operator should: - ✔✔Refer to the manufacturer's working area diagram. A crane that climbs a 7% grade, one mile hill, should descend down the hill in: - ✔✔Either fourth or fifth gear. A lattice boom truck crane, when setup out of level, will lose the most capacity with? - ✔✔Long boom; short radius. The device that automatically stops the boom when it nears the maximum boom angle is the: - ✔✔Boom hoist kickout When a lattice boom truck crane is operating on properly set outriggers, the tipping axis is located at the:

• ✔✔Point where the outriggers touch the ground. The purpose of placing mats or cribbing under outrigger floats is to: - ✔✔Distribute the downward force of the float over a larger area. A crane loses stability when its leverage on the load is: - ✔✔Less than the load's leverage on the crane. If a lattice boom truck crane is going to perform work over the front it must have: - ✔✔A front-mounted outrigger.

Each outrigger pad and its blocking should be sufficient to support: - ✔✔The total weight of the crane and its load. How does high wind affect the setup of a crane with a long boom? - ✔✔Introduces side load onto the boom. When a lattice boom truck crane that is properly setup with no front outrigger and the boom is positioned over the front, the combined center of gravity of the carrier and the upperworks will move: - ✔✔Closer to the axis. When personnel platforms are lifted with a telescopic crane: - ✔✔A two-block damage prevention system is provided. What item can be removed from a carrydeck? - ✔✔Boom extension. The lever on the far left of most hydraulic cranes is: - ✔✔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? - ✔✔Hoist up, extend out, and lower the boom. When transporting a load on the deck of a carrydeck crane, the operator should: - ✔✔Travel with the outriggers partially extended. Jib capacities are based on : - ✔✔Structural strength. When making a lift on outriggers, the maximum ground-bearing pressure occurs: - ✔✔Over the corner. A crane's jib is offset 15º versus its original 0º offset, but the boom angle remains unchanged. In this situation, the load radius: - ✔✔Increases. Blocking which is not tightly placed may fail at: - ✔✔50% of design.

If the jib is offset, the crane's capacity will: - ✔✔Be reduced. The safest speed for a crane carrying a load is: - ✔✔The manufacturer's speed limit. The boom angle indicator indicates: - ✔✔Angle of boom to horizontal. When preforming a pick-and-carry lift with a rough-terrain hydraulic crane, which of the following is the most important consideration? - ✔✔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 verticle cylinders are down, and floats are on good supports. The operator must: - ✔✔Use the "on rubber" load chart.