The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/π %, calculate the mechanical advantage.
-
A.
400 -
B.
300 -
C.
200 -
D.
150
Correct Answer: Option C
Explanation
P = 0.45cm, L = 60cm, Eff = 75/π%
| VR | (Screw | system) | = | 2πr
P |
= | 2πL
P |
| M.A | = | Eff% × VR
100 |
= | 75
π |
× | 1
100 |
× | 2π × 60
0.45 |
= | 75 × 800
300 |
= | 200 |
There is an explanation video available below.