The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/Ï€ %, calculate the mechanical advantage.
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Correct Answer: Option C
Explanation:
P = 0.45cm, L = 60cm, Eff = 75/Ï€%
VR
(Screw
system)
=
2Ï€r
P
=
2Ï€L
P
Â
M.A
=
Eff% × VR
100
=
75
Ï€
×
1
100
×
2π × 60
0.45
=
75 × 800
300
=
200
Â
P = 0.45cm, L = 60cm, Eff = 75/Ï€%
VR
(Screw
system)
=
2Ï€r
P
=
2Ï€L
P
Â
M.A
=
Eff% × VR
100
=
75
Ï€
×
1
100
×
2π × 60
0.45
=
75 × 800
300
=
200
Â