Workshop Technology
The adhesiveness is the property of sand due to which

None of these
It clings to the sides of a moulding box
The sand grains stick together
It evolves a great amount of steam and other gases

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Workshop Technology
Extrusion

Is extensively used for making bolts and nuts
Is used for reducing the diameter of round bars and tubes by rotating dies which open and close rapidly on the work
Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
Consists of pressing the metal inside a chamber to force it out by high pressure through an orifice which is shaped to provide the desired form of the finished part

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