Rigging Units 1/3/4 Flashcards
In building the Egyptian pyramids, blocks of stones weighing about 2-1/2 tons were move upward using a(n) ___________.
Inclined plane
The giant stone slabs of Stongehenge were brought to an upright position using a series of ________ & fulcrums.
Levers
What device did Polynesian workers use to erect 50-ton stone monoliths on Easter Island?
Wedge
A jack handle is an example of a(n) __________.
Lever
The most primary of machine principles used in rigging operations is the _________.
Wheel
Blocks, when reeved, become a _________, which by definition is a device by which forces may be advantageously applied to do work.
Machine
Blocks, when reeved, work like a machine, yet are not 100% efficient because of ________.
Friction
If the lead line enters the standing block first, is it included in determining the number of parts of line?
No
The increase in load-carrying ability is accompanied by a corresponding decrease in ___________.
Speed of travel
Wire rope consists of many individual wires laid into a number of strands which are, in turn, laid around a ____________.
Center core
The distance in which a strand makes a revolution around the rope is called _________.
Lay length
Fatigue is caused by the constant _________ of the rope over sheaves and around drums.
Bending
Abrasion is caused by _______.
Friction
What is the minimum acceptable safety factor for rigging ropes?
5
What is the single most important operational check to be made on hoisting and rigging equipment?
Rope and rigging inspection
Shock loading may cause a rope to ___________.
Overstress
What is the main object of external lubrication?
Filling the gaps between the strands and rope
Spliced eyes must incorporate ____________ to maintain rope strength and reduce wear.
Rope thimbles
What is the most common method used to make an eye?
A cable clip
When making a cable clip connection, which clamp offers the greatest efficiency?
Long, double base clamp
True or false: It is a good practice to give rope a certain length of service, then replace the rope regardless of its condition.
True
True or false: If there is any evidence of a wire break in one lay, the rope should be replaced.
False
True or false: Corrosion is more dangerous than wear.
True
Should you ever use a clip to directly connect two straight lengths of rope?
No
