Workshop Technology
The current in electric resistance welding can be regulated by

Changing the secondary turns of the transformer
Changing the primary turns of the transformer
Varying the input supply
Any one of the listed here

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Workshop Technology
Riddle is used for

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

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