Machine Design
In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

Remain unaffected with cross-section area
Would depend upon other factors
Increasing the cross-section area of bar
Decreasing the cross-section area of bar

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Machine Design
In worm, gears, pitch lead angle is

The angle between the tangent to the pitch helix and the plane of rotation
None of these
Half the angle between two inclined faces in axial plane
The angle between the tangent to the pitch helix and an element of the cylinder

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