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Efficiency of a screw jack is given by(where Î± = Helix angle, and Ï† = Angle of friction.)

$\frac { tan(\alpha + \phi) } {tan\alpha }$

$\frac {tan\alpha } { tan(\alpha + \phi) }$

$\frac { tan(\alpha - \phi) } {tan\alpha }$

$\frac {tan\alpha } { tan(\alpha - \phi) }$

Answer : Option B

Explanation :

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