Workshop Technology
The binder commonly used in making oil sand, is

Organic type binder
Any one of the listed here
Clay type binder
Inorganic type binder

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Workshop Technology
During hot working of metals

Porosity of the metal is largely eliminated
Grain structure of the metal is refined
All of the listed here
Mechanical properties are improved due to refinement of grains

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Workshop Technology
The purpose of a gate is to

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

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