Roof Sailing Rigging and Line Systems

Question 1

Which knot is most commonly used to secure a lifeline to a fixed anchor point on a roof?

Accepted Answer

Bowline

Answer

Reef knot

Answer

Slip knot

Answer

Overhand knot

Question 2

What is the minimum working load limit (WLL) rating required for a personal fall arrest anchor point under OSHA standards?

Accepted Answer

5,000 lbs per worker attached

Answer

2,500 lbs per worker attached

Answer

1,000 lbs per worker attached

Answer

3,000 lbs per worker attached

Question 3

Which type of rope is preferred for roof rigging systems due to its high strength-to-weight ratio and low stretch characteristics?

Accepted Answer

Kernmantle static rope

Answer

Manila fiber rope

Answer

Twisted nylon rope

Answer

Polypropylene rope

Question 4

When inspecting a rope for continued use, which defect would require immediate removal from service?

Accepted Answer

Core damage visible through the sheath

Answer

Slight surface abrasion on the sheath

Answer

Mild stiffness from cold temperatures

Answer

Minor dirt embedded in the outer fibers

Question 5

A prusik hitch is used in roof rigging systems primarily for which purpose?

Accepted Answer

As a friction hitch that grips under load but slides when unweighted

Answer

As a permanent anchor knot at the ridge

Answer

To join two ropes of equal diameter

Answer

To prevent a rope from fraying at cut ends

Question 6

What is the purpose of a rope grab device in a horizontal lifeline system on a roof?

Accepted Answer

To allow a worker to move along the line while automatically arresting a fall

Answer

To permanently fix the lifeline to an anchor

Answer

To reduce the rope's overall tension during use

Answer

To splice two lifeline sections together

Question 7

When setting up a rigging system on a sloped roof, the anchor line should be positioned at what minimum angle relative to the roof surface?

Accepted Answer

As close to perpendicular (90°) to the slope as practical

Answer

Parallel to the roof slope

Answer

At a 45° angle downslope

Answer

At a 30° angle upslope