Workshop Technology
In order to produce uniform packing of sand in the moulds, a _________ is used.

Stripper plate machine
Sand slinger
Squeezing machine
Jolt machine

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

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

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