Workshop Technology
In a four high rolling mill, the diameter of backing up rolls is ________ the diameter of working rolls.

Larger than
Smaller than
Equal to
None of these

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Workshop Technology
A jolt machine is used to

Produce uniform packing of sand in the mould
Ram the sand harder at the pattern face with decreasing hardness towards the back of the mould
Ram the sand harder at the back of the mould and softer on the pattern face
Produce uniform sand hardness throughout the mould

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