Machine Design
The designation M 33 × 2 of a bolt means

Metric threads of 33 numbers in 2 cm
Bolt of 33 mm nominal diameter having 2 threads per cm
Metric threads of 33 mm outside diameter and 2 mm pitch
Metric threads with cross-section of 33 mm

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Machine Design
In case of V belt drive

None of these
The belt should touch the bottom of groove in the pulley
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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