Machine Design
The endurance or fatigue limit is defined as the maximum value of the stress which a polished standard specimen can withstand without failure, for infinite number of cycles, when subjected to

Dynamic load
Completely reversed load
Static load
Static as well as dynamic load

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Machine Design
In worm, gears, pitch lead angle is

None of these
The angle between the tangent to the pitch helix and the plane of rotation
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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Machine Design
A compound belt drive is used when

None of these
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the opposite directions

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