Workshop Technology
The temperature at which the new grains are formed in the metal is called

Recrystallisation temperature
Eutectic temperature
Upper critical temperature
Lower critical temperature

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Workshop Technology
Riddle is used for

Smoothing and cleaning out depressions in the mould
Reinforcement of sand in the top part of moulding box
Cleaning the moulding sand
Moistening the sand around the edge before removing pattern

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Workshop Technology
Sand wash is a casting defect which

Occurs near the ingates as rough lumps on the surface of a casting
Results in a mismatching of the top and bottom parts of a casting
Results in general enlargement of the casting
Occurs as sand patches on the upper surface of a casting

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