Manufacturing And Production Technology
Shrinkage allowance on pattern is provided to compensate for shrinkage when

The metal changes from liquid to solid state at freezing temperature
The temperature of liquid metal drops from pouring to freezing temperature
The temperature of metal drops from pouring to room temperature
The temperature of solid phase drops from freezing to room temperature

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

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

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