Workshop Technology
A hacksaw blade cuts on the

Cutting depends upon the direction of force
Return stroke
Forward stroke
Both forward and return strokes

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Workshop Technology
The purpose of a riser is to

Deliver molten metal into the mould cavity
Act as a reservoir for the molten metal
Feed the molten metal to the casting in order to compensate for the shrinkage
Deliver the molten metal from pouring basin to gate

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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 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 to the negative terminal

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