SRT Mechanical Advantage & Z-Drag 3

Question 1

A 5:1 mechanical advantage system requires how many rope segments supporting the load compared to a 3:1 system?

Accepted Answer

Two more segments

Answer

A 5:1 has five rope segments supporting the load versus three in a 3:1, requiring additional pulleys and a longer rope run.

Question 2

What is the theoretical mechanical advantage of a piggyback (3:1 added to a 3:1) compound system?

Accepted Answer

9:1

Answer

A 3:1 pulling on another 3:1 multiplies the advantages: 3 × 3 = 9:1 theoretical mechanical advantage.

Question 3

During a Z-drag operation in swiftwater, which team member's role is to call 'take!' and 'reset!' to coordinate the haul cycle?

Accepted Answer

The team leader or haul team captain

Answer

The team leader or haul captain gives verbal commands to synchronize hauling and PCD management so the load never slips.

Question 4

When a Z-drag rope passes over a sharp rock edge, what is the recommended mitigation to reduce rope damage and friction?

Accepted Answer

Apply a rope pad or edge protector

Answer

Edge protectors or rope pads shield the rope from abrasion and reduce friction, preserving rope integrity and system efficiency.

Question 5

If a prussik used as a PCD fails to hold the haul line, which of the following is the MOST likely cause?

Accepted Answer

The prussik cord diameter is too small relative to the haul line

Answer

A prussik cord that is too thin relative to the haul line will not generate enough friction to grip effectively under load.

(SRT) Swiftwater Rescue Technician Certification Practice Test