The efficiency of screw jack for raising the load is (a) (frac{tan alpha}{tan (alpha-phi)}) (b) (frac{tan alpha}{tan

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The efficiency of screw jack for raising the load is

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

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

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

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

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