Machine Design
Basic hole is one

Whose lower as well as upper deviations are zero
Whose lower deviation is zero
Whose upper deviation is zero
Does not exist

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Machine Design
An open belt drive is used when

Shafts are arranged parallel and rotate in the same directions
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
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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