engineering recuitment AAI JE Technical Mock Test 2020-21 Design of Machine Elements Power Screws Efficiency of Screws
If α denotes the lead angle and φ denotes the angle of friction, then the efficiency of the screw is given by
1
\(\frac{tan~(\alpha~-~\phi)}{tan~\alpha}\)
2
\(\frac{tan~\alpha}{tan~(\alpha~-~\phi)}\)
3
\(\frac{tan~(\alpha~+~\phi)}{tan~\alpha}\)
4
\(\frac{tan~\alpha}{tan~(\alpha~+~\phi)}\)