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

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

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Workshop Technology
During hot working of metals

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

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Workshop Technology
For arc welding

Alternating current with high frequency is used
Alternating current with low frequency is used
Any one of these
Direct current is used

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