Machine Design
In a multiple V-belt drive, if one of the belts break, then

The broken belt need not to be replaced
The entire set of belts is replaced
Only the broken belt is replaced
The broken belt and the belt on either side of it, is replaced

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Machine Design
The elasticity is the property of a material which enables it to

Retain deformation produced under load permanently
Regains its original shape after deformation when the external forces are removed
Draw into wires by the application of a tensile force
Resists fracture due to high impact loads

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

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

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