+1 vote
in Machine Kinematics by (38.0k points)
In a lifting machine, the effort required to lift loads of 200N and 300N were 50N and 60N respectively. If the velocity ratio of the machine is 20 determine efficiency to load of 300 N.

(a) 10 %

(b) 15 %

(c) 20 %

(d) 25 %

I had been asked this question by my school principal while I was bunking the class.

The query is from Relative Velocity of Two Bodies Moving in Straight Lines topic in section Velocity in Mechanisms of Machine Kinematics

1 Answer

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by (106k points)
Right option is (d) 25 %

For explanation: When W = 300 N, P = 60 N

M.A. = W/P = 300/60 = 5

V.R. = 20

Efficiency at this load ȵ = M.A./V.R. x 100 = 5/20 x 100 = 25 %.

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