MCQOPTIONS
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MCQOPTIONS
| 1. |
The efficiency of a screw jack is maximum, whenWhere α = Helix angle and ϕ = Angle of friction. |
| A. | \(\alpha = 45^\circ + \frac{\phi }{2}\) |
| B. | \(\alpha = 45^\circ- \frac{\phi }{2}\) |
| C. | α = 90° + ϕ |
| D. | α = 90° - ϕ |
| Answer» C. α = 90° + ϕ | |