Compound Pulley Systems and Z-Rig Mechanical Advantage Quiz
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Compound Pulley Systems and Z-Rig Mechanical Advantage Quiz

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@PleasurableOrangutan

Questions and Answers

A bight is formed when a rope crosses over itself.

False

The standing part of a rope is the section that threads through to complete the knot.

False

Safety knots are primarily used to increase the strength of the rope.

False

A bend connects the free end of two ropes together.

<p>False</p> Signup and view all the answers

All knots increase the strength of the rope.

<p>False</p> Signup and view all the answers

A loop is a turn of rope that does not cross itself.

<p>False</p> Signup and view all the answers

To test the system, the stretcher should be lifted up to a vertical position and the patient should not drop during the process.

<p>True</p> Signup and view all the answers

The Furley Stretcher Tie-In is a method used to connect a casualty securely to a Furley stretcher.

<p>False</p> Signup and view all the answers

High forces are rarely encountered during rope rescue operations.

<p>False</p> Signup and view all the answers

It is not necessary to assess the strength of an anchor when planning a rescue operation.

<p>False</p> Signup and view all the answers

To reduce leverage on a vertical anchor, it is recommended to secure the anchor attachment far from the ground.

<p>False</p> Signup and view all the answers

Building a bridle anchor from two anchor points is unnecessary when anchors are not in line with the rescue.

<p>False</p> Signup and view all the answers

If the distance between a highpoint COD and the ground is high enough to cause harm, then the rigging should be run at ground level.

<p>True</p> Signup and view all the answers

Most rescues can be accomplished with an 8:1 pulley system.

<p>False</p> Signup and view all the answers

A prusik will slip at around 300 kg (660 lbs).

<p>False</p> Signup and view all the answers

Rescuers need to calculate the force that will be exerted by the MAs before using a pulley system.

<p>True</p> Signup and view all the answers

Belaying is primarily used for rigging purposes in rescue operations.

<p>False</p> Signup and view all the answers

Using a COD is essential in situations where the main anchor point aligns perfectly with the load.

<p>False</p> Signup and view all the answers

In a compound pulley system with different MAs, it is recommended to attach the system with a higher MA to the load.

<p>False</p> Signup and view all the answers

A Z-Rig MA is a 4:1 MA made with a single rope.

<p>False</p> Signup and view all the answers

Complex MA systems require more equipment compared to simple MA systems.

<p>False</p> Signup and view all the answers

A change of direction (COD) within a MA occurs when the pulling force on the rope end is traveling in the same direction as the load travel.

<p>False</p> Signup and view all the answers

A Z-Rig gets its name from the shape it forms when deconstructed.

<p>False</p> Signup and view all the answers

Ideally, separate anchors for each Mechanical Advantage (MA) should be less than a meter apart.

<p>False</p> Signup and view all the answers

Munter Belay techniques are suitable for high-structural or cliff rescues.

<p>False</p> Signup and view all the answers

A safety belay system never comes under tension unless there has been a failure in the main line.

<p>True</p> Signup and view all the answers

A whistle test is used to ensure that the safety belay system can withstand catastrophic events.

<p>False</p> Signup and view all the answers

For mine rescue rope rigging, it is recommended to have only one independent rope system as a back-up.

<p>False</p> Signup and view all the answers

Munter Belay techniques are quick to set up in situations where immediate first aid is needed.

<p>True</p> Signup and view all the answers

Safety Belay Systems are designed to fail in case of equipment failure or human error in the main line.

<p>False</p> Signup and view all the answers

Study Notes

Knots, Bends, and Hitches

  • Rescuers must be able to tie knots, bends, and hitches in all conditions
  • Key factors to consider when choosing a knot:
    • Proven safety for intended use
    • Sufficient strength for its role
    • Easy to tie and untie
    • Does not affect system strength beyond acceptable safety factor

Types of Knots

  • Knot: a connection method used in rope or webbing to tie it to itself
  • Bend: a tie that connects the ends of two ropes or webbing together
  • Hitch: a tie that attaches a rope or webbing to another object
  • Bight: an open turn formed when a rope is doubled back upon itself
  • Standing part: the inactive section of rope during the process of tying a knot
  • Running end: the end of rope that threads through to complete the knot
  • Loop: a turn of rope that crosses itself
  • Tail: the free end of rope that extends from a knot

Safety Knots and Stretcher Tie-In

  • Safety knots are used to prevent fraying and to stop from sliding through a block, hole, or other knot
  • Example of a stretcher tie-in: Furley Stretcher Tie-In, which securely lashes a casualty to a furley stretcher

Anchors

  • Anchors must be solid and unmovable relative to the load being applied ("bombproof")
  • Two or more anchors should be incorporated into the system whenever possible to minimize leverage
  • Critical angle: when anchors are not in line with the rescue, a bridle anchor from two anchor points is necessary
  • Anchor leverage: securing the anchor attachment close to the ground reduces leverage on a vertical anchor

Mechanical Advantage Systems

  • Z-Rig: a 3:1 mechanical advantage system made with a single rope that can be easily changed to a higher MA
  • Complex MA systems: combining two simple MA systems to accomplish a larger MA with less equipment
  • Change of Direction (COD): where the pulling force on the rope end is traveling in the opposite direction of the load travel
  • COD is needed in situations with limited space, misaligned haul lines, embankment-type rescues, and cliff rescues

Large Mechanical Advantage Systems

  • 6:1 pulley system can accomplish most rescues
  • 8:1 and 9:1 systems are not recommended due to rope and space requirements
  • Safe working loads of rigging equipment must be considered in terms of force applied by these larger MAs
  • Rescuer Pulling Force: the average rescuer can pull with a maximum force of 23 kg (55 lbs)

Belaying

  • Belaying is used to protect a person or load from falling
  • Munter Belay techniques can be used for a single person safety line on low-angle consolidated slope
  • Safety belay systems:
    • Catches the load of the main line if it fails without an operator to engage it
    • Must be able to survive the event sufficiently undamaged and allow load to move up or down

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Description

Test your knowledge on resetting compound pulley systems with different mechanical advantages and using Z-Rig mechanical advantage systems in rope rescue scenarios. Learn about best practices for attaching and pulling loads with varying mechanical advantages.

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