Machine Design
An open belt drive is used when

Shafts are arranged parallel and rotate in the same directions
Shafts are arranged at right angles and rotate in one definite direction
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the opposite directions

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Machine Design
Tapered roller bearings can take

Axial load only
Both radial and axial loads and the ratio of these being less than unity
Both radial and axial loads and the ratio of these being greater than unity
Radial load only

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Machine Design
In worm, gears, pitch lead angle is

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
None of these
The angle between the tangent to the pitch helix and the plane of rotation

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