Machine Design
The shear plane in case of bolts should

Never be across the threaded portion
Be across threaded portion of shank
Be normal to threaded portion of shank
Be parallel to axis of bolt

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Machine Design
Pitch point of a cam is

Any point on the pitch curve
A point on the pitch curve having minimum pressure angle
Any point on the pitch circle
A point on the pitch curve having maximum pressure angle

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

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

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