Workshop Technology
V-block is used to

Check the trueness of flat surfaces
Locate centres of round rods
None of these
Check the surface roughness

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Workshop Technology
Extrusion

Is extensively used for making bolts and nuts
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
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

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