Workshop Technology
A progressive limit gauge has

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

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Workshop Technology
Extrusion

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
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

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Workshop Technology
Riddle is used for

Smoothing and cleaning out depressions in the mould
Reinforcement of sand in the top part of moulding box
Moistening the sand around the edge before removing pattern
Cleaning the moulding sand

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