Machine Design
The load cup of a screw jack is made separate from the head of the spindle to

Reduce the value of frictional torque
Reduce the effort needed for lifting the working load
Prevent the rotation of load being lifted
Enhance the load carrying capacity of the jack

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Machine Design
Crowning on pulley helps

To increase pulley life
In increasing the slip of the belt
To keep the belt in centre on a pulley while it is in motion
In decreasing the slip of the belt

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

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

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