Question 12 of 30
A lead block is used in a derrick when rigging the
A
Purchase to advantage
B
Stay wire
C
Preventer wire
D
Heel block
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Answer & Explanation
The correct answer is Option A: Purchase to advantage.
A lead block, often a single sheave block, is used in a derrick rig to change the direction of the running part of a rope, enabling the purchase to be rove to advantage. This means the direction of pull is adjusted for more efficient lifting.