Manufacturing And Production Technology
A jig is defined as a device which

Holds and locates a workpiece and guides and controls one or more cutting tools
Holds and locates a workpiece during an inspection or for a manufacturing operation
Is used to check the accuracy of workpiece
All of these

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Manufacturing And Production Technology
In centreless grinding, work place centre will be

On the line joining the two wheel centres
Above the line joining the two wheel centres
At the intersection of the line joining the wheel centres with the work place plane
Below the line joining the two wheel centres

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