The efficiency of a screw jack is maximum, when(where `alpha`= Helix angle, and `phi` = Angle of friction.) Options: A . &nbsp`alpha = 45^circ + phi //2` B . &nbsp`alpha = 45^circ - phi //2` C . &nbsp`alpha = 90^circ + phi` D . &nbsp`alpha = 90^circ - phi`

The efficiency of a sc

Question

The efficiency of a screw jack is maximum, when(where `alpha`= Helix angle, and `phi` = Angle of friction.)

Options:

A . `alpha = 45^circ + phi //2`

B . `alpha = 45^circ - phi //2`

C . `alpha = 90^circ + phi`

D . `alpha = 90^circ - phi`

Answer: Option B

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