Efficiency of a screw jack is given by(where `alpha` = Helix angle, and `phi` = Angle of friction.) Options: A . &nbsp`(tan (alpha + phi))/(tan alpha)` B . &nbsp`(tan alpha)/(tan (alpha + phi))` C . &nbsp`(tan (alpha - phi))/(tan alpha)` D . &nbsp`(tan alpha)/(tan (alpha - phi))`

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Question

Efficiency of a screw jack is given by(where `alpha` = Helix angle, and `phi` = Angle of friction.)

Options:

A . `(tan (alpha + phi))/(tan alpha)`

B . `(tan alpha)/(tan (alpha + phi))`

C . `(tan (alpha - phi))/(tan alpha)`

D . `(tan alpha)/(tan (alpha - phi))`

Answer: Option B

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