NWSA Rigging and Hoisting Operations 3

Question 1

What is the purpose of a gin pole in tower rigging operations?

Accepted Answer

To provide a temporary lifting point above the work area for hoisting materials and equipment up the tower

Answer

A gin pole is a temporary lifting device mounted on the tower that provides a high anchor point for hoisting operations.

Question 2

What safety precaution must be taken when using a capstan hoist for tower work?

Accepted Answer

The operator must maintain proper wraps on the drum, never allow the rope to override, and keep hands clear of the pinch point

Answer

Capstan hoists rely on friction between the rope and rotating drum. Improper wraps or contact with the pinch point can cause serious injuries.

Question 3

How does wind affect rigging operations on towers?

Accepted Answer

Wind creates lateral forces on loads, increases dynamic loading, and can cause loads to swing into the tower structure or workers

Answer

Wind creates unpredictable lateral forces on suspended loads, especially large antenna panels that act as sails.

Question 4

What is the correct method for inspecting wire rope used in tower hoisting?

Accepted Answer

Hands-on inspection checking for broken wires, corrosion, kinking, birdcaging, diameter reduction, and core protrusion

Answer

Wire rope deteriorates from use, environmental exposure, and internal fatigue. Thorough hands-on inspection detects conditions that would cause failure.

Question 5

What is meant by the term 'sling angle factor' and why is it critical in tower rigging?

Accepted Answer

It describes how the angle of sling legs from vertical increases the tension in each leg, reducing effective capacity

Answer

As sling legs angle further from vertical, the tension in each leg increases due to geometric forces.

NWSA - National Wireless Safety Alliance Practice Test

NWSA - National Wireless Safety Alliance Practice Test

NWSA Rigging and Hoisting Operations 3