# A machine raised a load of 360 N through a distance of 200 mm. The effort, a force of 60 N moved 1.8 m during the process. Calculate efficiency at this load.

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A machine raised a load of 360 N through a distance of 200 mm. The effort, a force of 60 N moved 1.8 m during the process. Calculate efficiency at this load.

(a) 44.44%

(b) 55.55%

(c) 66.66%

(d) 77.77%

The question was posed to me by my college professor while I was bunking the class.

The origin of the question is Relative Velocity of Two Bodies Moving in Straight Lines topic in division Velocity in Mechanisms of Machine Kinematics

by (106k points)
Right option is (c) 66.66%

To explain: Given, load raised, W = 360 N

Effort applied, P = 60 N

Distance moved by the effort, y = 1.8 m

Distance moved by the load, x = 200 mm = 0.2 m

Mechanical advantage, M.A. = W/P = 360/60 = 6

Velocity ratio, V.R. = y/x = 1.8/0.2 = 9

Efficiency at the load, ȵ = M.A./V.R. x 100 = 6/9 x 100 = 66.66%.

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