GSK Exit Exam • Set 4 Question 26 of 30
The power gained in a threefold purchase is
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Direct Answer
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).
All Options
A
More than a twofold purchase when rove to advantage
(Correct Answer)
B
Less than a twofold purchase
C
More than a gun-tackle
D
Same as a twofold purchase
Detailed Explanation & Context
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).
Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • General Ship Knowledge (GSK).
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