Question

The mechanical advantage of a combination of three movable pulleys with a fixed pulley will be

• A. 4
• B. 8
• C. 2
• D. 16

Answer 1

The correct option is B 8

In this quetion refer fiq. as shown.
The $effort$ here is define as $F$
And $Load$ as $R$
$R$ is define by relation to $F$
$F=\frac{R}{2^N},$where N is number of puley attached to system
Using $MA=\frac{R}{F}$ and $N=3$
we get $MA=8$