Question 5 of 30
The power gained in a threefold purchase is
A
More than a twofold purchase when rove to advantage
B
Less than a twofold purchase
C
More than a gun-tackle
D
Same as a twofold purchase
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Answer & Explanation
The correct answer is Option A: More than a twofold purchase when rove to advantage.
A threefold purchase offers a mechanical advantage of 3:1 when rove to advantage, meaning it multiplies the applied force three times. This provides significantly more lifting power than a twofold purchase (2:1) or a gun-tackle (2:1).