NCCCO Practice Questions and Answers for Crane Operators, Exams of Mobile Computing

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NCCCO Practice QUESTIONS & CORRECT

ANSWERS(RATED A+)

Crane configuration includes: A. reeving, boom length, counterweight, on outriggers, on rubbers, extensions or jibs stowed or mounted, off sets, wire rope type or construction B. hoist drum speeds, line pull, wire rope size and rigging C. load charts, LMI, axle weights and center of gravity D. drum rotation indicator, anti-two block, axle lock outs, and positive house lock - ANSWER A How does the operator determine the manufacturers recommended rope for the crane? A. count the sheaves in the boom tip and divide the potential parts into the cranes capacity, then determine the proper care B. read the manufacturer load chart or operator manual C. measure the rope and determine capacity according to size D. measure the wire rope and sheave groove to be sure of the proper rope for the crane - ANSWER B

A crawler crane is based on ___________ stability of static load A. 100% B. 85% C. 75% D. 20% - ANSWER C What quadrant produces the least amount of ground pressure on a lattice crawler? A. side B. front C. corner D. rear - ANSWER A When a crawler crane is on a barge the list chart must be provided by the: A. employer B. crane owner C. superintendent D. manufacturer - ANSWER D

When disassembling or assembling booms on lattice boom cranes, it is extremely important to A. always be inside the boom to drive out the lower pins B. drive the top pins out from inside the boom C. always keep the pendants taut and connected at the boom cranes D. never touch any pin on any boom section located between the pendant attachment points and the crane - ANSWER D On a lattice boom crane, the device that automatically stops when it nears thee maximum angle is the A. boom hoist kick out B. mechanical boom stop C. boom hoist pawl D. load moment - ANSWER A When is it safe to handle loads under power lines? A. when a second signal person is used B. when a crane is equipped with an isolated link or proximity alarm C. when the boom is kept 10 feet away from the power line

D. no part of the crane of load can come closer to the power lines than regulations allow - ANSWER D What is the main purpose of mid-point suspension pendants? A. to relieve the load on the bottom when it is being raised B. to absorb the shock that comes with dynamic loading C. to add structural integrity to the boom D. to increase tipping capacities - ANSWER A The main purpose of a gantry or a mast on a crane is A. to decrease the parts of boom hoist line on the block B. to increase boom hoist speed C. to increase the crane'e leverage on the boom D. to decrease the boom hoist speed - ANSWER C When using a mobile crane on a barge, the crane's load capacity chart shall be: A. replaced by a duty cycle chart B. replaced by a list chart C. de-rated to 50% D. de-rated to 60% - ANSWER B

Blocking can be placed under the ends of tracks to: A. stop the crane from sliding unexpectedly B. stop crane from traveling unexpectedly C. increase the crane's stability when operating over side D. increase the crane's stability when operating over front or back - ANSWER D Manufacturer specifications only permit 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 is called the A. head section length B. cantilever length C. butt section length D. jib section length - ANSWER B When operating a crawler crane, the ground pressure will always be highest over the A. corner

B. front C. side D. rear - ANSWER A Unless working in loose soft soil, a crawler crane should always travel ___________ on pick and carry operations A. away from the load B. towards the load C. as quickly as possible D. with the crawler facing the load extended - ANSWER B Why use mats or cribbing? A. to increase ground pressure B. to reduce ground pressure C. for long boom cranes D. to lift outriggers or crawlers off the ground - ANSWER B Mats are usually ______ together A. bolted

B. tied C. glued D. nailed - ANSWER A When a carrier-mounted lattice boom crane is operating on properly set outriggers, the tipping axis is located at the A. radius of the counterweights B. center pin of the crane C. radius of the boom point D. point where the outriggers touch the ground - ANSWER D Swinging a fixed-length boom to a different quadrant increases the possibility of tipping over backward in a crane that is working on A. outriggers at a short radius B. outriggers at a long radius C. tires at a short radius D. tires at a long radius - ANSWER C

When making a lift with a lattice boom crawler crane, ground pressure can be reduced by lifting over the A. front B. corner C. rear D. side - ANSWER D Pendant spreader bars on long booms are used to prevent A. main pendants from scrubbing the boom sides B. misalignment of the boom cable C. stretching of pendant lines D. deflection at the center of the boom - ANSWER A What effect does having the crawlers retracted have on a crawler crane with a long boom? A. decrease in wear on the tracks B. decrease in capacity C. increase in capacity D. increase in maneuverability - ANSWER B

A crawler crane traveling forward is defined as traveling in the direction of A. a load B. the bull gear C. the drive sprocket D. the idler - ANSWER D A correct statement about installing a pin-connected lattice boom on mobile crane is that the A. boom hoist pawl should be used during the installation B. crane should not be on outriggers during the installation C. boom hoist brake should be used to hold the boom D. pins can be removed from underneath the boom - ANSWER A On a lattice boom truck crane, boom angle is measured between the centerline of the A. unloaded boom and the horizontal B. unloaded boom and the carrier deck C. loaded boom and the horizontal D. loaded boom and the vertical - ANSWER C

If the angle from the jib to the ground is changed from 50 degrees to 40 degrees, the operator has A. decreased the capacity of the jib B. removed a 10-ft insert C. shortened the forestay pendants D. increased head clearance - ANSWER A