Question 1

Dynamic load factor

Accepted Answer

The ratio of the dynamic load to the static load on a crane during operation.

Question 2

Anti-two-block device

Accepted Answer

A safety device that prevents the hook block from contacting the boom point sheave.

Question 3

Luffing jib

Accepted Answer

A type of jib that can be adjusted in angle by raising or lowering the jib.

Question 4

Outrigger

Accepted Answer

Extendable support structures used to stabilize a crane during operation.

Question 5

Boom angle indicator

Accepted Answer

A device that shows the angle between the horizontal plane and the boom.

Question 6

Load moment indicator (LMI)

Accepted Answer

A device that calculates the moment produced by the load and compares it to the crane's capacity.

Question 7

Overload protection system

Accepted Answer

A system that prevents a crane from lifting loads exceeding its rated capacity.

Question 8

Deadman's switch

Accepted Answer

A safety device that stops crane operation if the operator releases the control.

Question 9

Swing brake

Accepted Answer

A brake system that controls the rotational movement of the crane.

Question 10

Counterweight

Accepted Answer

The weight used to balance the crane and provide stability during operation.

Question 11

Load radius

Accepted Answer

The horizontal distance between the center of the crane's rotation axis and the center of gravity of the load.

Question 12

Reeving

Accepted Answer

The arrangement of wire rope between the drum and the hook block.

Question 13

Pendant lines

Accepted Answer

Steel cables that connect the upper and lower parts of a lattice boom crane.

Question 14

Block-and-tackle system

Accepted Answer

A system of pulleys used to multiply the lifting force of the crane.

Question 15

Wind loading

Accepted Answer

The effect of wind pressure on the crane and load during operation.

Question 16

Side-loading

Accepted Answer

Lateral force applied to the crane when lifting off-center loads.

Question 17

Boom deflection

Accepted Answer

The bending of the crane boom caused by the weight of the load.

Question 18

Trolley travel

Accepted Answer

The movement of the trolley along the length of the jib.

Question 19

Two-blocking

Accepted Answer

The dangerous condition where the hook block contacts the boom point sheave.

Question 20

Drum lagging

Accepted Answer

The surface covering of the drum to provide better grip for the wire rope.

Question 21

Sheave

Accepted Answer

A grooved wheel in a pulley system that guides and supports the wire rope.

Question 22

Sling angle

Accepted Answer

The angle between the sling and the horizontal plane when supporting a load.

Question 23

Whip line

Accepted Answer

A secondary hoist line used for lighter loads and faster operation.

Question 24

Footing

Accepted Answer

The base support for the crane, providing stability and load distribution.

Question 25

Hook latch

Accepted Answer

A safety device that prevents the load from accidentally slipping off the hook.

Question 26

Load chart

Accepted Answer

A document that provides the crane's lifting capacities at various radii and boom lengths.

Question 27

Load testing

Accepted Answer

The process of applying a known load to a crane to verify its performance and capacity.

Question 28

Tag line

Accepted Answer

A rope used to control the swing and rotation of a suspended load.

Question 29

Boom stop

Accepted Answer

A device that prevents the boom from being raised beyond a predetermined angle.

Question 30

Boom hoist

Accepted Answer

The mechanism that raises and lowers the boom.

Question 31

Tower crane jacking

Accepted Answer

The process of raising or lowering the height of a tower crane by adding or removing mast sections.

Question 32

Crane signal person

Accepted Answer

A designated individual responsible for communicating with the crane operator using hand signals or radio communication.

Question 33

Fall zone

Accepted Answer

The area around the crane where materials or equipment may fall during operation.

Question 34

Tail swing

Accepted Answer

The clearance required for the counterweight or rear of the crane during rotation.

Question 35

Wire rope inspection

Accepted Answer

The process of examining the wire rope for damage, corrosion, and wear.

Question 36

Crane setup

Accepted Answer

The process of assembling and preparing a crane for operation.

Question 37

Boom backstops

Accepted Answer

Devices that prevent the boom from falling backward if the hoist line fails.

Question 38

Kickback

Accepted Answer

The sudden backward movement of the crane's boom, caused by a sudden release of load or other forces.

Question 39

On-rubber lifts

Accepted Answer

Lifting operations where the crane is not supported by outriggers but by its tires.

Question 40

Two-part line

Accepted Answer

A reeving system where the wire rope travels from the drum to the load and back.

Question 41

Load swing

Accepted Answer

The swinging motion of a suspended load, which can be caused by wind or movement of the crane.

Question 42

Boom stowage cradle

Accepted Answer

A device used to secure the boom when the crane is not in operation.

Question 43

Drum flange

Accepted Answer

The edge of the drum that prevents the wire rope from slipping off the sides.

Question 44

Snubbing

Accepted Answer

The process of controlling a load's movement by applying friction to the hoisting rope.

Question 45

Duty cycle

Accepted Answer

The number of operational hours that the crane is designed to work within a given period.

Question 46

Tower crane climbing

Accepted Answer

The process of increasing the height of a tower crane by adding sections to the tower.

Question 47

Deceleration distance

Accepted Answer

The distance a crane needs to safely stop when moving a load.

Question 48

Boom length

Accepted Answer

The distance from the center of the crane's rotation axis to the point of the boom.

Question 49

Load float

Accepted Answer

A function that allows the load to be held at a constant elevation for a brief period.

Question 50

Bracing

Accepted Answer

The structural elements that help to reinforce and provide stability to the crane.

Question 51

Trolley jib

Accepted Answer

A type of jib that has a trolley moving along its length.

Question 52

Free on board (FOB)

Accepted Answer

A term used to determine when the risk and responsibility of goods is transferred from the seller to the buyer.

Question 53

Radius of action

Accepted Answer

The maximum horizontal distance from the center of rotation to the hook in the working area.

Question 54

Wire rope lay

Accepted Answer

The direction and manner in which the strands of a wire rope are twisted.

Question 55

Crane log

Accepted Answer

A document that records the operation, maintenance, and inspection activities of a crane.

Question 56

Stability triangle

Accepted Answer

The three-point suspension system that provides stability to a mobile crane.

Tower Crane Operator: Advanced Red Seal Exam Prep Flashcards