In a block and tackle system consisting of 3 pulleys, a load of 75 kgf is raised with an effort of 25 kgf. Find the efficiency.

50%

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100%

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25%

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150%

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Solution

The correct option is B
100%

Given : Total number of pulleys, n = 3

Load, L = 75 kgf, Effort,E = 25 kgf

M.A = Total number of pulleys, i.e., n = 3

V.R = Number of strands tackle supporting the load, n = 3

% Efficiency, $η = \frac{M . A}{V . R} \times 100 = \frac{3}{3} \times 100 = 100$

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Q. In a block and tackle system consisting of 3 pulleys, a load of 75 Kgf is raised with an efforts of 25 Kgf.
Find:- (i) the mechanical advantage, (ii) the velocity ratio, and (iii) the efficiency.

In a block and tackle system consisting of 3 pulleys, a load of 75 kgf is raised with an effort of 25 kgf. Find : (i) the mechanical advantage, (ii) the velocity ratio, and (iii) the efficiency.

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In a block and tackle system consisting of 3 pulleys, a load of 75 kgf is raised with an effort of 25 kgf. Find the efficiency.

The correct option is B 100% Given : Total number of pulleys, n = 3 Load, L = 75 kgf, Effort,E = 25 kgf M.A = Total number of pulleys, i.e., n = 3 V.R = Number of strands tackle supporting the load, n = 3 % Efficiency, η=M.AV.R×100=33×100 =100

The correct option is B
100%

Given : Total number of pulleys, n = 3

Load, L = 75 kgf, Effort,E = 25 kgf

M.A = Total number of pulleys, i.e., n = 3

V.R = Number of strands tackle supporting the load, n = 3

% Efficiency, $η = \frac{M . A}{V . R} \times 100 = \frac{3}{3} \times 100 = 100$