Machine Design
Basic hole is one

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

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Machine Design
An open belt drive is used when

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
Shafts are arranged at right angles and rotate in one definite direction
Shafts are arranged parallel and rotate in the same directions

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