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Applied Mechanics

Q1: In a simple screw jack, the pitch of the screw is 9 mm and length of the handle operating the screw is 45 cm. The velocity ratio of the system is

A 1.5

B 5

C 25

D 314

ANS:D - 314

Distance moved by effort =2*π*L.

Distance moved by Load=pitch of the screw.
Velocity ratio = 2*π*L/pitch of screw,
= 2*π*450/9,
= 314 (ANS).



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