NCCCO Mobile Crane Terminology Test
Study Guide.
Accessory - answerA secondary part or assembly of parts which contributes to the overall
function and usefulness of a machine.
Appointed - answerMeans assigned specific responsibilities by the employer or the employer's
representative.
ANSI - a...
Accessory - answer✔A secondary part or assembly of parts which contributes to the overall
function and usefulness of a machine.
Appointed - answer✔Means assigned specific responsibilities by the employer or the employer's
representative.
ANSI - answer✔American National Standards Institute.
Angle indicator - answer✔An accessory which measures the angle of the boom to the horizontal.
Axis of rotation - answer✔The vertical axis around which the crane superstructure rotates.
Axle - answer✔The shaft or spindle with which or about which a wheel rotates. On truck- and
wheelmounted cranes it refers to an automotive type of axle assembly including housings,
gearing, differential, bearings, and mounting appurtenances.
Axle (bogie) - answer✔Two or more automotive-type axles mounted in tandem in a frame so as
to divide the load between the axles and permit vertical oscillation of the wheels.
Base (mounting) - answer✔The traveling base or carrier on which the rotating superstructure is
mounted such as a car, truck, crawlers, or wheel platform.
Boom (crane) - answer✔A member hinged to the front of the rotating superstructure with the
outer end supported by ropes leading to a gantry or A-frame and used for supporting the hoisting
tackle
Boom angle - answer✔The angle between the longitudinal centerline of the boom and the
horizontal. The boom longitudinal centerline is a straight line between the boom foot pin (heel
pin) centerline and boom point sheave pin centerline.
Boom hoist - answer✔A hoist drum and rope reeving system used to raise and lower the boom.
The rope system may be all live reeving or a combination of live reeving and pendants.
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