Manufacturing And Production Technology
Hardness of green sand mould increases with

Increase in moisture content beyond 6 percent
Decrease in permeability
Increase in both moisture content and permeability
Increase in permeability

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

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