Workshop Technology
A basic shaft is one whose

Upper deviation is zero
Lower and upper deviations are zero
None of the listed here
Lower deviation is zero

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Workshop Technology
In permanent mould casting method

Molten metal is poured and allowed to solidify while the mould is revolving
None of these
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

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