A pulley system has a velocity ratio 3 and an efficiency of 80%. Calculate the mechanical advantage of the system.

1.2

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1.6

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2.0

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2.4

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Solution

The correct option is D
2.4

Given: velocity ratio = 3, efficiency = 80%

Efficiency % $= \frac{M A}{V R} \times 100$
or $80 = \frac{M A}{3} \times 100$
or $M A = \frac{80 \times 3}{100} = 2.4$

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