Machine Design
In order to ensure self locking in a screw jack, it is essential that helix angle is __________ friction angle.

Smaller than
Larger than
Equal to
None of these

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Machine Design
A compound belt drive is used when

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

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Machine Design
In case of V belt drive

The belt should touch the bottom of groove in the pulley
None of these
The belt should not touch the sides of groove in the pulley
The belt should not touch the bottom of groove in the pulley

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