Workshop Technology
In order to ram the sand harder at the back of the mould and softer on the pattern face, a ________ is used.

Squeezing machine
Stripper plate machine
Sand slinger
Jolt machine

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

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

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