Machine Design
Set screws are

Used to prevent relative motion between parts
Similar to stud
Slotted for a screw driver and generally used with a nut
Similar to small size tap bolts except that a greater variety of shapes of heads are available

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Machine Design
Spring stiffness is

Its capability of storing energy
Load required to produce unit deflection
Ratio of coil diameter to wire diameter
Its ability to absorb shocks

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Machine Design
In worm, gears, pitch lead angle is

The angle between the tangent to the pitch helix and an element of the cylinder
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

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