Workshop Technology
When filing soft metals, the file teeth are clogged with minute particles of metal. The file should be cleaned by

Using file card
Washing it with dilute acid
Washing it with water
Rubbing on wood

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Workshop Technology
For arc welding

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

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Workshop Technology
In a simple die

None of the listed here
Both cutting and non-cutting operations are performed at one station of the press in every 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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