A machine has a velocity ratio of 5. It requires a 50kg weight to overcome a 200kg weight. The efficiency is
-
A.
4% -
B.
5% -
C.
40% -
D.
50% -
E.
80%
Correct Answer: Option E
Explanation
Efficiency = M.A x 100%
= (frac{200}{50}) x (frac{1}{5}) x 100
= 80%