Question

what is the efficiency of a machine which has MA equal to 2 and VR is 4?

i) 50% ii) 25%

iii) 100% iv) 75%​

Answer 1

Answer:

Load =75kgf

Effort =25kgf

Number of pulleys n=3

We know that,

The mechanical advantage is

M.A=

E

L

M.A=

25

75

M.A=3

Now, the velocity ratio is

Velocity ratio = numbers of pulleys

V.R=3

Now, the efficiency is

η=

V.R

M.A

η=

3

3

η=1×100

η=100%

Hence, this is the required solution