Workshop Technology
A three high rolling mill consists of three rolls placed one above the other. Which of the following statement is correct?

The upper and middle rolls rotate in the same direction whereas the bottom roll rotates in opposite direction
The bottom and middle roll rotate in the same direction
Any one of the above
The upper and bottom rolls rotate in the same direction whereas the middle roll rotates in opposite direction

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Workshop Technology
Swab is used for

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

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