RRC Rope Systems & Throw Bag Techniques 2

Question 1

In a Z-drag mechanical advantage system used in river rescue, what is the approximate pulling advantage it provides?

Accepted Answer

3:1

Answer

A Z-drag creates a 3:1 mechanical advantage, meaning three units of rope movement at the hauling end moves the load one unit.

Question 2

What is the most common knot used to form a fixed loop at the end of a rescue rope when attaching to a victim or anchor?

Accepted Answer

Figure-eight on a bight

Answer

The figure-eight on a bight is preferred in rescue because it is strong, easy to inspect visually, and does not jam under heavy load.

Question 3

What is a Munter hitch (Italian hitch) primarily used for in rope-based river rescue systems?

Accepted Answer

Creating a belay or rappel without a descender device

Answer

The Munter hitch creates friction on a carabiner to control descent or provide a belay without needing a mechanical device.

Question 4

What is the minimum recommended tensile (breaking) strength for a rescue rope used in swiftwater operations according to NFPA 1983 technical use standards?

Accepted Answer

20 kN (4,500 lbf)

Answer

NFPA 1983 requires a minimum 20 kN breaking strength for technical-use rescue rope to ensure an adequate safety margin under dynamic loads.

Question 5

A 'load-releasing hitch' (such as a Mardsen or Radium release) is incorporated into a tensioned rescue rope system for what critical reason?

Accepted Answer

To allow the tensioned rope to be safely eased after the load is on it

Answer

A load-releasing hitch allows rescuers to slowly release tension from a highly loaded rope system without dangerous shock loads or the need to cut the line.

RRC - River Rescue Certification Practice Test

RRC - River Rescue Certification Practice Test

RRC Rope Systems & Throw Bag Techniques 2