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

Jolt machine
Squeezing machine
Sand slinger
Stripper plate machine

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Workshop Technology
Riddle is used for

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

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