Efficiency of a screw jack is given by (where $$\alpha $$ = Helix angle and $$\varphi $$ = Angle of friction)
A. $$\frac{{\tan \left( {\alpha + \varphi } \right)}}{{\tan \alpha }}$$
B. $$\frac{{\tan \alpha }}{{\tan \left( {\alpha + \varphi } \right)}}$$
C. $$\frac{{\tan \left( {\alpha - \varphi } \right)}}{{\tan \alpha }}$$
D. $$\frac{{\tan \alpha }}{{\tan \left( {\alpha - \varphi } \right)}}$$
Answer: Option B
This Question Belongs to Mechanical Engineering >> Theory Of Machine
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