Machine Design
When the screw in a mechanical screw jack rotates, the load kept on the top of it moves

None of these
Axially upwards
Axially upwards or downwards
Axially downwards

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Machine Design
The flank of the tooth is the

Surface of the tooth below the pitch surface
Surface of the tooth above the pitch surface
Width of the tooth measured along the pitch circle
Surface of the top of the tooth

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