Workshop Technology
Cores are used to

Improve mould surface
Form internal cavities in the casting
All of these
Form a part of a green sand mould

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Workshop Technology
In a compound die

Both cutting and non-cutting operations are performed at one station of the press in every stroke of the ram
Only one operation is performed at each stroke of the ram
Two or more cutting operations are performed at one station of the press in every stroke of the ram
Two or more operations are performed simultaneously at the single stroke of the ram

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

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