NCCER Crane Crane Components, Configurations & Terminology 4

Question 1

Load radius is measured as the horizontal distance from:

Accepted Answer

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

Answer

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

Question 2

Two-blocking occurs when:

Accepted Answer

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

Answer

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

Question 3

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

Accepted Answer

Increase lifting capacity of the line but reduce hoisting speed

Answer

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

Question 4

Boom angle is defined as the angle between the:

Accepted Answer

Boom centerline and the horizontal

Answer

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

Question 5

Tail swing refers to:

Accepted Answer

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

Answer

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

(NCCER Crane) National Center for Construction Education and Research Crane Certification Practice Test