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Question

From the diagram given below, what effort has to be applied at C to just raise the Load L = 20 Kg?
(Neglect the weight of pulley A and friction)


A

10 kgf

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B

15 kgf

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C

20 kgf

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D

30 kgf

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Solution

The correct option is A

10 kgf


(i) Pulley A is a single movable pulley while Pulley B is a single fixed pulley.
(ii) Pulley B helps to change the direction of applied effort in a convenient direction.
(iii) Load, L = 20 Kg
Mechanical Advantage of the combination of pulleys, MA = 2
Also, MA=LoadEffort
Effort =LMA=202=10 kgf
The effort to be applied at C = 10 kgf


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