engineering recuitment UKPSC Polytechnic Lecturer Mock Test 2024 Design of Machine Elements Power Screws Efficiency of Screws
The maximum efficiency of screw jack is
1
\(\frac{1-sin~\phi}{1+sin~\phi}\)
2
\(\frac{1+sin~\phi}{1-sin~\phi}\)
3
\(\frac{{1 - tan\phi }}{{1 + tan\phi }}\)
4
\(\frac{{1 + tan\phi }}{{1 - tan\phi }}\)