Workshop Technology
In order to ram the sand harder at the back of the mould and softer on the pattern face, a ________ is used.

Sand slinger
Jolt machine
Squeezing machine
Stripper plate machine

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Workshop Technology
Riddle is used for

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

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