Crane Components, Configurations & Terminology Flashcards

Load radius is measured as the horizontal distance from:

Answer: The center of rotation to the center of the hook or load

Radius is the horizontal distance from the axis of rotation to the center of gravity of the suspended load.

Two-blocking occurs when:

Answer: The lower load block or hook contacts the upper block or boom tip

Two-blocking can part the hoist rope or damage the boom and drop the load.

Increasing the number of parts of line on a hook block will:

Answer: Increase lifting capacity of the line but reduce hoisting speed

More parts share the load among more rope segments but the hook moves slower per drum revolution.

Boom angle is defined as the angle between the:

Answer: Boom centerline and the horizontal

Boom angle is measured from horizontal to the boom's centerline.

Tail swing refers to:

Answer: The radius swept by the rear of the upperworks or counterweight as the crane rotates

Tail swing radius must be barricaded to prevent pinch and crush hazards.

Which of the following must typically be deducted from gross chart capacity to find the net load that can be lifted?

Answer: Hook block, slings, and rigging weight

Anything below the boom tip such as blocks, balls, and rigging counts as part of the load.

Load charts often give different capacities for working areas such as over the front, over the side, and over the rear. These areas are called:

Answer: Quadrants of operation

Capacity varies by quadrant because stability differs depending on boom position relative to the carrier.