Machine Design
Taper on the cotter and slot is provided

May be provided anywhere
On none of the sides
On one side only
On both the sides

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Machine Design
A bolt of M 24 × 2 means that

The pitch of the thread is 24 mm and depth is 2 mm
The nominal diameter of bolt is 24 mm and pitch is 2 mm
Cross-sectional area of the threads is 24 mm²
The effective diameter of bolt is 24 mm and there are 2 threads per cm

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Machine Design
An open belt drive is used when

Shafts are arranged at right angles and rotate in one definite direction
Driven shaft is to be started or stopped whenever desired without interfering with the driving shaft
Shafts are arranged parallel and rotate in the same directions
Shafts are arranged parallel and rotate in the opposite directions

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