If α denotes the lead angle and φ denotes the angle of friction, then the efficiency of the screw is given by

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

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

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

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

If α denotes the lead angle and φ denotes the angle of friction, the

1.	If α denotes the lead angle and φ denotes the angle of friction, then the efficiency of the screw is given by
A.	\(\frac{tan~(\alpha~-~\phi)}{tan~\alpha}\)
B.	\(\frac{tan~\alpha}{tan~(\alpha~-~\phi)}\)
C.	\(\frac{tan~(\alpha~+~\phi)}{tan~\alpha}\)
D.	\(\frac{tan~\alpha}{tan~(\alpha~+~\phi)}\)
Answer» E.

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If α denotes the lead angle and φ denotes the angle of friction, then the efficiency of the screw is given by

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