Question 1

Outrigger

Accepted Answer

Extending support structure used to stabilize the crane while in operation.

Question 2

Boom Angle Indicator

Accepted Answer

Device that displays the angle of the boom relative to a level ground.

Question 3

Load Moment Indicator (LMI)

Accepted Answer

Safety device that provides real-time lifting information and alerts when the crane is approaching overload condition.

Question 4

Wire Rope

Accepted Answer

Strong, flexible type of cable used to hoist and move loads.

Question 5

Working Load Limit (WLL)

Accepted Answer

Maximum safe load that a crane or hoist can handle under specific conditions.

Question 6

Load Chart

Accepted Answer

Document detailing the crane's lifting capacities at different boom angles and lengths.

Question 7

Two Blocking

Accepted Answer

A dangerous condition where the lower load block or hook assembly comes into contact with the upper block or boom point.

Question 8

Jib

Accepted Answer

Extension attached to the end of the boom to increase reach.

Question 9

Radius

Accepted Answer

Distance from the center of rotation to the center of the load.

Question 10

Load Radius Indicator

Accepted Answer

Device that provides the operator with the distance from the center of rotation to the load.

Question 11

Anti-Two-Block Device

Accepted Answer

Safety device that prevents the hook block from colliding with the boom tip.

Question 12

Swing Brake

Accepted Answer

Device used to halt the crane's swing or rotational movement.

Question 13

Free on Board (FOB)

Accepted Answer

Term indicating that the seller is responsible for the goods until they're loaded on the vehicle for transport.

Question 14

Tag Line

Accepted Answer

Rope used to control the load's spin and sway.

Question 15

Counterweight

Accepted Answer

Weight added to the rear of the crane to balance the load.

Question 16

Sheave

Accepted Answer

Grooved wheel in the block that wire rope runs over.

Question 17

Backstay

Accepted Answer

Cable or strut used to support the boom.

Question 18

Block

Accepted Answer

Pulley system used to increase the lifting capacity of the crane.

Question 19

Load Control

Accepted Answer

Techniques used by the operator to prevent uncontrolled movement of the load.

Question 20

Gross Load

Accepted Answer

The total weight of the load, rigging, and all other equipment attached to the load line.

Question 21

Net Load

Accepted Answer

The weight of the load alone, not including rigging or other equipment.

Question 22

Duty Cycle

Accepted Answer

The operational pattern of a crane, including lifting, swinging, and idling times.

Question 23

Load Test

Accepted Answer

A test where the crane lifts a specific weight to verify it can handle its rated capacity.

Question 24

Stability

Accepted Answer

Ability of the crane to remain upright and secure under the load.

Question 25

Luffing

Accepted Answer

The act of moving the boom up (luffing up) or down (luffing down).

Question 26

Tandem Lift

Accepted Answer

A lift operation involving more than one crane.

Question 27

Critical Lift

Accepted Answer

A lift that exceeds 75% of the crane's rated capacity or involves other specific risks.

Question 28

Fall

Accepted Answer

The part of the wire rope that directly connects to the lifting hook.

Question 29

Reeving

Accepted Answer

The configuration of wire rope through the crane's sheaves.

Question 30

Dynamic Loading

Accepted Answer

Additional loading occurring when the load is moving or when the crane is subjected to environmental forces.

Question 31

Swing

Accepted Answer

Rotational movement of the crane.

Question 32

Under the Hook Lifting Device

Accepted Answer

A device used to attach a load to the crane.

Question 33

Load Drifting

Accepted Answer

Situation when the load moves or drifts away from its intended path.

Question 34

Runaway

Accepted Answer

Uncontrolled movement of the crane.

Question 35

Side Loading

Accepted Answer

Dangerous situation where the load is applied sideways to the crane's boom.

Question 36

Snubbing

Accepted Answer

The act of controlling the lowering of a load by friction.

Question 37

Deadman’s Switch

Accepted Answer

Safety device that requires constant pressure from the operator to remain active.

Question 38

Boom Deflection

Accepted Answer

The bending or curving of the boom due to load or force.

Question 39

Drum

Accepted Answer

The cylindrical part of the crane onto which the wire rope is wound.

Question 40

Footing

Accepted Answer

The solid base on which the crane is erected to ensure stability.

Question 41

Dogging

Accepted Answer

The act of directing crane operations using hand signals or radios.

Question 42

Slew

Accepted Answer

The rotation of the crane's superstructure, allowing it to swing the load horizontally.

Question 43

Bridge Travel

Accepted Answer

The movement of the crane along the bridge or gantry.

Question 44

Derricking

Accepted Answer

The act of adjusting the boom angle by increasing or decreasing the boom's incline.

Question 45

Spotter

Accepted Answer

A person assigned to watch and guide the crane's movement during operation.

Question 46

Overhaul Ball

Accepted Answer

A weight attached to the hook to maintain tension in the hoist line.

Question 47

Boom Stop

Accepted Answer

A safety device that prevents the boom from moving beyond a predetermined maximum angle.

Question 48

Boom Hoist

Accepted Answer

A mechanism used for raising, lowering, or holding the boom.

Question 49

Trolley

Accepted Answer

The unit that travels on the bridge rails, carrying the hoisting mechanism.

Question 50

Spreader Bar

Accepted Answer

A type of below-the-hook lifting device used to distribute a load of multiple lift points.

Question 51

Pendants

Accepted Answer

Non-telescoping steel rods or struts that connect the crane's upper and lower structures.

Question 52

Mechanical Splices

Accepted Answer

Connections that join the ends of wire ropes together.

Question 53

Lifting Beam

Accepted Answer

A rigid member used to spread apart the legs of a sling.

Question 54

Bridle Sling

Accepted Answer

A sling composed of multiple legs with a fitting that connects to the hoist hook.

Question 55

Shock Loading

Accepted Answer

Sudden force or load applied to a crane that could potentially lead to failure.

Question 56

Quadruple Reeving

Accepted Answer

The configuration of wire rope where four ropes are used for lifting.

Question 57

Rooster Sheave

Accepted Answer

A single sheave mounted at the boom tip, used for one part of line operations.

Question 58

Hot Line Operation

Accepted Answer

Crane operation near energized power lines.

Question 59

Bull Rope

Accepted Answer

A rope used to apply a force, generally a sideways pull, to the load.

Question 60

On Rubber

Accepted Answer

Crane operation where the load is lifted while the crane is supported by its tires.

Question 61

Rigging Plan

Accepted Answer

A plan detailing how the crane and rigging will be used to lift and move a load.

Question 62

Center of Gravity

Accepted Answer

The point in the load where weight is equally distributed in all directions.

Question 63

Boom Launching

Accepted Answer

The method of extending the boom using hydraulic cylinders.

Question 64

Telescoping

Accepted Answer

The act of extending or retracting the sections of a telescopic boom.

Red Seal Exam: Mobile Crane Operator Flash Cards