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The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the ...


Question

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.

Options

A) 400

B) 300

C) 200

D) 150

The correct answer is C.

Explanation:

P = 0.45cm, L = 60cm, Eff = 75/π%

VR(Screwsystem)=2πr
P
=2πL
P
M.A=Eff% × VR
100
=75
π
×1
100
×2π × 60
0.45
=75 × 800
300
=200

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