engineering recuitment BPSC AE Mock Test 2025 Design of Machine Elements Power Screws Efficiency of Screws
The efficiency of a power screw is maximum, when the lead (helix) angle is
1
\(\frac{{\rm{\pi }}}{2} - \frac{{\rm{\phi }}}{2}\)
2
\(\frac{{\rm{\pi }}}{2} - {\rm{\phi }}\)
3
\(\frac{{\rm{\pi }}}{4} - \frac{{\rm{\phi }}}{2}\)
4
\(\frac{{{\rm{\pi \;}}}}{4} - {\rm{\phi }}\)