A pulley system has a velocity ratio $3$ and an efficiency of $80 %$ . Calculate the effort required to raise a load of $300 N$ .

125 N

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300 N

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150 N

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225 N

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Solution

The correct option is A $125 N$
$V e l o c i t y R a t i o = 3$

$E f f i c i e n c y = 80 / 100$

$M e c h a n i c a l A d v a n t a g e = e f f i c i e n c y \times V e l o c i t y r a t i o$

$\Rightarrow \frac{80}{100} \times 3$

$\Rightarrow 2.4$

$M . A = \frac{l o a d}{e f f o r t}$

$2.4 = \frac{300 N}{E f f o r t}$

$\Rightarrow E f f o r t = \frac{300 N}{2.4} = 125 N$

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A pulley system has a velocity ratio 3 and an efficiency of 80%. Calculate the effort required to raise a load of 300N.

The correct option is A 125NVelocity Ratio=3Efficiency=80/100Mechanical Advantage=efficiency×Velocity ratio⇒80100×3⇒2.4M.A=loadeffort2.4=300NEffort⇒Effort=300N2.4=125N

A pulley system has a velocity ratio $3$ and an efficiency of $80 %$ . Calculate the effort required to raise a load of $300 N$ .