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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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