Workshop Technology
The instrument which has all the features of try-square, bevel protractor, rule and scriber, is

Combination set
Outside micrometer
Depth gauge micrometer
Inside micrometer

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Workshop Technology
In permanent mould casting method

Molten metal is forced into mould under high pressure
Molten metal is poured in a metallic mould, retained in the mould long enough for the outer skin to solidify and finally mould is turned over to remove molten metal still in molten condition
Molten metal is poured and allowed to solidify while the mould is revolving
None of these

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Workshop Technology
Spot welding is used for welding

Butt joints in plates having thickness above 3 mm
Lap joints in plates having 0.025 mm to 1.25 mm thickness
Lap joints in plates having thickness above 3 mm
Butt joints in plates having 0.025 mm to 1.25 mm thickness

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