Workshop Technology
Cores are used to

All of these
Form a part of a green sand mould
Improve mould surface
Form internal cavities in the casting

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

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

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