A machine has a velocity ratio of 4; if it requires 800N to overcome a load of 1600N. What is the efficiency of the machine?

A. 60%
B. 50%
C. 40%
D. 2%

Correct Answer:

Option B = 50%

Explanation

Efficiency = (M.A)/V.R X (100)/1
But M.A = (Load)/Effort = (1600)/800 = 2
Efficiency = (2)/4 x (100)/1 = 50%