Machine Design
The period during which the cam follower remains at rest, when cam moves, is known as

Constant period
Dwell period
Fixed period
Idle period

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

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