NCCCO Telescoping Boom and Jib Configuration

Question 1

Before extending a telescoping boom section, the operator must first ensure the boom is:

Accepted Answer

Free of any suspended load

Answer

At maximum elevation angle

Answer

Fully lubricated at all pivot points

Answer

Operating at full engine RPM

Question 2

When a mobile crane's telescoping boom is extended to a longer length, the rated lifting capacity will:

Accepted Answer

Decrease as the increased radius increases the load moment

Answer

Increase proportionally with boom length

Answer

Remain unchanged for all boom lengths

Answer

Only change if a jib is also attached

Question 3

The fly jib 'offset angle' on a mobile crane refers to:

Accepted Answer

The angle between the jib and the main boom centerline

Answer

The angle the main boom makes with the ground

Answer

The horizontal swing arc of the jib

Answer

The maximum elevation angle of the jib tip

Question 4

What is the primary purpose of a fly jib (boom extension) on a mobile crane?

Accepted Answer

To extend the crane's reach in height or radius beyond the main boom

Answer

To increase the maximum rated lifting capacity

Answer

To reduce overall boom assembly weight

Answer

To allow operation without deployed outriggers

Question 5

When using a jib attachment, which load chart must the operator reference?

Accepted Answer

The jib-specific chart for the exact jib length and offset angle being used

Answer

The main boom chart at full extension

Answer

The standard rigging chart for the hoist line

Answer

Any chart showing a capacity above the required load

Question 6

Mechanical locking pins on telescoping boom sections are critical because they:

Accepted Answer

Secure the boom section in position if hydraulic pressure is lost

Answer

Increase hydraulic cylinder pressure during extension

Answer

Prevent the boom from rotating on the turntable

Answer

Are only required for lifts exceeding 50% of rated capacity

Question 7

Before operating with a newly assembled jib configuration, an operator must verify that:

Accepted Answer

All connecting pins are fully inserted, secured, and properly cottered

Answer

The jib color matches the manufacturer's specification

Answer

The jib has been tested at 110% of rated capacity

Answer

A licensed engineer has approved the jib configuration