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A progressive limit gauge has

Separate 'Go' and 'Not go' members
'Go' and 'Not go' member on the same side of the gauge
None of the listed here
'Go' member at one end and 'Not go' member at the other end

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Extrusion

Is used to improve fatigue resistance of the metal by setting up compressive stresses in its surface
Is used for reducing the diameter of round bars and tubes by rotating dies which open and close rapidly on the work
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 extensively used for making bolts and nuts

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The welding set up is said to have straight polarity, when

Work is connected to the negative terminal and the electrode holder to the positive terminal
Work is connected to the positive terminal and the electrode holder to the negative terminal
Work is connected to the positive terminal and the electrode holder is earthed
Work is connected to the negative terminal and the electrode holder is earthed

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