Question: ?A screw will be self-locking, if .Friction angle is more than helix angle .Friction angle is equal to helix angle .% Efficiency of the

?A screw will be self-locking, if .Friction angle is more than helix angle .Friction angle is equal to helix angle .% Efficiency of the screw is 100 O .Friction angle is less than helix angle O

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